# Elsevier

# Journal of Econometrics

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**Current editor:**T. Amemiya

**Current editor:**A. R. Gallant

**Current editor:**J. F. Geweke

**Current editor:**C. Hsiao

**Editor:**

Additional information is available for the following
registered editor(s): A. Ronald Gallant
John Geweke
Cheng Hsiao
Arnold Zellner
**For corrections or technical questions regarding this series, please contact
(Zhang, Lei)**

**Series handle:**repec:eee:econom

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### 1995, Volume 65, Issue 1

**9-43 High-tech capital formation and economic performance in U.S. manufacturing industries An exploratory analysis***by*Berndt, Ernst R. & Morrison, Catherine J.**45-81 The production and cost structure of Israeli industry Evidence from individual firm data***by*Bregman, Arie & Fuss, Melvyn & Regev, Haim**83-108 General purpose technologies 'Engines of growth'?***by*Bresnahan, Timothy F. & Trajtenberg, M.**109-154 Quantile regression, Box-Cox transformation model, and the U.S. wage structure, 1963-1987***by*Buchinsky, Moshe**155-174 The production-theoretic measurement of input price and quantity indices***by*Fisher, Franklin M.**175-203 Firm productivity in Israeli industry 1979-1988***by*Griliches, Zvi & Regev, Haim**205-233 Nonlinear errors in variables Estimation of some Engel curves***by*Hausman, J. A. & Newey, W. K. & Powell, J. L.**235-261 A random linear functional approach to efficiency bounds***by*Holly, Alberto**263-293 Exploring the relationship between R&D and productivity in French manufacturing firms***by*Hall, Bronwyn H. & Mairesse, Jacques**295-332 A limit theorem for a smooth class of semiparametric estimators***by*Pakes, Ariel & Olley, Steven

### 1994, Volume 64, Issue 1-2

**3-27 Comparison of Box--Tiao and Johansen canonical estimators of cointegrating vectors in VEC(1) models***by*Bewley, Ronald & Orden, David & Yang, Minxian & Fisher, Lance A.**29-43 Exact finite-sample relative efficiency of suboptimally weighted least squares estimators in models with ordered heteroscedasticity***by*Szroeter, Jerzy**45-76 Specification tests in simultaneous equations systems***by*Dhrymes, Phoebus J.**77-96 Testing for linearity in a semiparametric regression model***by*Shively, Thomas S. & Kohn, Robert & Ansley, Craig F.**97-122 Measuring and comparing smoothness in time series the production smoothing hypothesis***by*Froeb, Luke & Koyak, Robert**123-144 Partially adaptive estimation via a normal mixture***by*Phillips, Robert F.**145-163 Parameter estimation in regression models with errors in the variables and autocorrelated disturbances***by*Dagenais, Marcel G.**165-182 A two-stage estimator for probit models with structural group effects***by*Borjas, George J. & Sueyoshi, Glenn T.**183-206 Bayes inference in regression models with ARMA (p, q) errors***by*Chib, Siddhartha & Greenberg, Edward**207-240 An exact likelihood analysis of the multinomial probit model***by*McCulloch, Robert & Rossi, Peter E.**241-278 Pairwise difference estimators of censored and truncated regression models***by*Honore, Bo E. & Powell, James L.**279-306 Subsample instability and asymmetries in money-income causality***by*Thoma, Mark A.**307-333 Autoregressive conditional heteroskedasticity and changes in regime***by*Hamilton, James D. & Susmel, Raul**335-353 Semiparametric estimation from time series with long-range dependence***by*Cheng, Bing & Robinson, P. M.**355-373 Coherency and estimation in simultaneous models with censored or qualitative dependent variables***by*Blundell, Richard & Smith, Richard J.**375-400 Stochastic volatility in asset prices estimation with simulated maximum likelihood***by*Danielsson, Jon

### 1994, Volume 63, Issue 2

**327-339 Jeffreys' prior for logit models***by*Poirier, Dale**341-388 Semiparametric instrumental variable estimation of simultaneous equation sample selection models***by*Lee, Lung-Fei**389-396 On the compatibility of nested logit models with utility maximization : A comment***by*Koning, Ruud H. & Ridder, Geert**397-405 The covariance matrix of ARMA errors in closed form***by*van der Leeuw, Jan

### 1994, Volume 63, Issue 1

**1-5 Structure and dynamics in econometrics***by*Kiviet, Jan F. & Dijk, Herman K. van**7-36 Identification of the long-run and the short-run structure an application to the ISLM model***by*Johansen, Soren & Juselius, Katarina**37-60 Testing for an unstable root in conditional and structural error correction models***by*Peter Boswijk, H.**61-103 Direct cointegration testing in error correction models***by*Kleibergen, Frank & van Dijk, Herman K.**105-131 Deciding between I(1) and I(0)***by*Stock, James H.**133-151 A multivariate approach to modeling univariate seasonal time series***by*Franses, Philip Hans**153-181 The asymptotics of single-equation cointegration regressions with I(1) and I(2) variables***by*Haldrup, Niels**183-214 Polynomial cointegration estimation and test***by*Gregoir, Stephane & Laroque, Guy**215-243 Bias assessment and reduction in linear error-correction models***by*Kiviet, Jan F. & Phillips, Garry D. A.**245-270 Encompassing in stationary linear dynamic models***by*Govaerts, Bernadette & Hendry, David F. & Richard, Jean-Francois**271-287 Simplified conditions for noncausality between vectors in multivariate ARMA models***by*Boudjellaba, Hafida & Dufour, Jean-Marie & Roy, Roch**289-306 Quasi-maximum likelihood estimation of stochastic volatility models***by*Ruiz, Esther**307-325 VAR analysis, nonfundamental representations, blaschke matrices***by*Lippi, Marco & Reichlin, Lucrezia

### 1994, Volume 62, Issue 2

**67-89 Incomplete panels : A comparative study of alternative estimators for the unbalanced one-way error component regression model***by*Baltagi, Badi H. & Chang, Young-Jae**91-128 Multiple optima and asymptotic approximations in the partial adjustment model***by*McManus, Douglas A. & Nankervis, John C. & Savin, N. E.**129-141 Moments of the ratio of quadratic forms in non-normal variables with econometric examples***by*Ullah, Aman & Srivastava, Virendra K.**143-163 A semiparametric efficiency bound of a disequilibrium model without observed regime***by*Ai, Chunrong**165-210 Estimating the canonical disequilibrium model : Asymptotic theory and finite sample properties***by*Laroque, Guy & Salanie, Bernard**211-228 Testing the constancy of regression parameters against continuous structural change***by*Lin, Chien-Fu Jeff & Terasvirta, Timo**229-264 Local asymptotic distribution related to the AR(1) model with dependent errors***by*Nabeya, Seiji & Perron, Pierre**265-276 Simple tests of distributional form***by*Anderson, Gordon**277-300 Bayesian semiparametric estimation of proportional hazards models***by*Ruggiero, Michele**301-316 On maximum likelihood estimation of the differencing parameter of fractionally-integrated noise with unknown mean***by*Cheung, Yin-Wong & Diebold, Francis X.**317-350 Estimation of partially nonstationary vector autoregressive models with seasonal behavior***by*Ahn, Sung K. & Reinsel, Gregory C.**351-382 Approximate generalized extreme value models of discrete choice***by*Small, Kenneth A.**383-414 Asymptotic robustness of tests of overidentification and predeterminedness***by*Anderson, T. W. & Kunitomo, Naoto**415-442 Testing for unit roots in seasonal time series : Some theoretical extensions and a Monte Carlo investigation***by*Ghysels, Eric & Lee, Hahn S. & Noh, Jaesum

### 1994, Volume 61, Issue 2

**197-233 Encompassing univariate models in multivariate time series : A case study***by*Maravall, Agustin & Mathis, Alexandre**235-257 Firm behavior under input rationing***by*Squires, Dale**259-272 Deterministic seasonal models and spurious regressions***by*Abeysinghe, Tilak**273-303 Stochastic frontier models : A Bayesian perspective***by*van den Broeck, Julien & Koop, Gary & Osiewalski, Jacek & Steel, Mark F. J.**305-344 Semiparametric two-stage estimation of sample selection models subject to Tobit-type selection rules***by*Lee, Lung-fei**345-366 Is the minimum chi-square estimator the winner in logit regression?***by*Hughes, Gordon A. & Savin, N. E.**367-382 The distribution of the Durbin-Watson statistic in integrated and near-integrated models***by*Hisamatsu, Hiroyuki & Maekawa, Koichi**383-394 The exact powers of some autocorrelation tests when the disturbances are heteroscedastic***by*Small, John P.**395-411 Bootstrap-based critical values for the information matrix test***by*Horowitz, Joel L.**413-428 On estimation and testing when explanatory variables are partly endogenous***by*Iwata, Shigeru

### 1994, Volume 61, Issue 1

**1-4 The econometrics of labor market segregation and discrimination***by*Neuman, Shoshana & Silber, Jacques**5-21 On discrimination and the decomposition of wage differentials***by*Oaxaca, Ronald L. & Ransom, Michael R.**23-42 Panel estimates of the gender earnings gap : Individual-specific intercept and individual-specific slope models***by*Polachek, Solomon W. & Kim, Moon-Kak**43-64 A new method for detecting individual and group labor market discrimination***by*Slottje, Daniel J. & Hirschberg, Joseph G. & Hayes, Kathy J. & Scully, Gerald W.**65-79 An empirical Bayes approach to analyzing earnings functions for various occupations and industries***by*Hirschberg, Joseph G. & Slottje, Daniel J.**81-102 Earnings discrimination measurement : A distributional approach***by*Jenkins, Stephen P.**103-131 Analysis of employment discrimination through homogeneous job groups***by*Conway, Delores A. & Roberts, Harry V.**133-146 Measuring occupational segregation : Summary statistics and the impact of classification errors and aggregation***by*Deutsch, Joseph & Fluckiger, Yves & Silber, Jacques**147-159 Economic distance and overlapping of distributions***by*Yitzhaki, Shlomo**161-171 Occupational segregation in the multidimensional case : Decomposition and tests of significance***by*Boisso, Dale & Hayes, Kathy & Hirschberg, Joseph & Silber, Jacques**173-196 The unemployment of ethnic minority groups in the Netherlands***by*Niesing, Willem & van Praag, Bernard M. S. & Veenman, Justus

### 1994, Volume 60, Issue 1-2

**1-22 Dynamic linear models with Markov-switching***by*Kim, Chang-Jin**23-63 Generic uniform convergence and equicontinuity concepts for random functions : An exploration of the basic structure***by*Potscher, Benedikt M. & Prucha, Ingmar R.**65-99 Global optimization of statistical functions with simulated annealing***by*Goffe, William L. & Ferrier, Gary D. & Rogers, John**101-132 Selectivity bias correction methods in polychotomous sample selection models***by*Schmertmann, Carl P.**133-144 A simplification of the Kopp--Diewert method of decomposing cost efficiency and some implications***by*Mensah, Yaw M.**145-156 Confidence sets centered at James--Stein estimators : A surprise concerning the unknown-variance case***by*Hwang, J. T. Gene & Ullah, Aman**157-180 Exact densities for variance estimators of the structural disturbances in simultaneous equations models***by*Smith, Murray D.**181-202 Local scale models : State space alternative to integrated GARCH processes***by*Shephard, Neil**203-233 Five alternative methods of estimating long-run equilibrium relationships***by*Gonzalo, Jesus**235-249 A revealed preference test for weakly separable utility maximization with incomplete adjustment***by*Swofford, James L. & Whitney, Gerald A.**251-272 Testing for autocorrelation in the presence of lagged dependent variables : A specification error approach***by*Dezhbakhsh, Hashem & Thursby, Jerry G.**273-291 Joint and separate score tests for state dependence and unobserved heterogeneity***by*Jaggia, Sanjiv & Trivedi, Pravin K.**293-312 Specification diagnostics for duration models : A martingale approach***by*McCall, Brian P.**313-320 Spurious regressions and residual-based tests for cointegration when regressors are cointegrated***by*Choi, In**321-321 Testing for a unit root in time series using instrumental variable estimators with pretest data based model selection (vol. 54 (1992) pp. 223-250)***by*Hall, Alastair

### 1993, Volume 59, Issue 3

**213-227 The identification of multivariate linear dynamic errors-in-variables models***by*Nowak, Eugen**229-255 The spurious effect of unit roots on vector autoregressions : An analytical study***by*Toda, Hiro Y. & Phillips, Peter C. B.**257-261 Measuring technical efficiency with panel data : A dual approach***by*Atkinson, Scott E. & Cornwell, Christopher**263-286 Testing for a unit root by frequency domain regression***by*Choi, In & Phillips, Peter C. B.**287-300 Unit root tests with conditional heteroskedasticity***by*Kim, Kiwhan & Schmidt, Peter**301-317 Estimation and testing in the random effects probit model***by*Guilkey, David K. & Murphy, James L.**319-341 Misspecifications in vector autoregressions and their effects on impulse responses and variance decompositions***by*Braun, Phillip A. & Mittnik, Stefan**377-389 Maximum entropy Lorenz curves***by*Holm, Juhani**391-403 Bayesian marginal equivalence of elliptical regression models***by*Osiewalski, Jacek & Steel, Mark F. J.**405-405 Monte Carlo results on several new and existing tests for the error component model (Vol. 54, No. 1-3 (1992) pp. 95-120)***by*Baltagi, Badi H. & Chang, Young-Jae & Li, Qi

### 1993, Volume 59, Issue 1-2

**1-4 Editors' introduction : The econometrics of panels and pseudo panels***by*Carraro, Carlo & Peracchi, Franco & Weber, Guglielmo**5-33 Simulation-based inference : A survey with special reference to panel data models***by*Gourieroux, Christian & Monfort, Alain**35-61 Orthogonality conditions for Tobit models with fixed effects and lagged dependent variables***by*Honore, Bo E.**63-86 A general framework for panel data models with an application to Canadian customer-dialed long distance telephone service***by*Hsiao, Cheng & Appelbe, Trent W. & Dineen, Christopher R.**87-97 On the testing of correlated effects with panel data***by*Arellano, Manuel**99-123 Identification and estimation of dynamic models with a time series of repeated cross-sections***by*Moffitt, Robert**125-136 Minimum MSE estimation of a regression model with fixed effects from a series of cross-sections***by*Verbeek, Marno & Nijman, Theo**137-160 Labour supply and intertemporal substitution***by*Blundell, Richard & Meghir, Costas & Neves, Pedro**161-185 A method for the analysis of the timing and magnitude of events in a continuous-time panel : The effects of British incomes policy, 1950-1973***by*Kurosawa, Masako & Pudney, Stephen**187-211 Modelling inaccuracies in job-search duration data***by*Torelli, Nicola & Trivellato, Ugo

### 1993, Volume 58, Issue 3

**275-294 Bayes regression with autoregressive errors : A Gibbs sampling approach***by*Chib, Siddhartha**295-314 Nonnested testing for autocorrelation in the linear regression model***by*Silvapulle, Paramsothy & King, Maxwell L.**315-346 Seemingly unrelated regressions under additive heteroscedasticity : Theory and share equation applications***by*Mandy, David M. & Martins-Filho, Carlos**347-368 Smooth unbiased multivariate probability simulators for maximum likelihood estimation of limited dependent variable models***by*Borsch-Supan, Axel & Hajivassiliou, Vassilis A.**369-384 Some generalizations on the algebra of I(1) processes***by*Ermini, Luigi & Granger, Clive W. J.**385-401 A simple multiple variance ratio test***by*Chow, K. Victor & Denning, Karen C.**403-403 Pre-testing for linear restrictions in a regression model with spherically symmetric disturbances (Vol. 50, No. 3 (1991) pp. 377-398)***by*Giles, Judith A.**405-405 The impact of stochastic and deterministic trends on money-output causality: A multi-country investigation (Vol. 45, No. 3 (1990) pp. 291-308)***by*Krol, Robert & Ohanian, Lee E.

### 1993, Volume 58, Issue 1-2

**1-2 Nonparametric and semiparametric approaches to discrete response analysis***by*Hardle, Wolfgang & Manski, Charles F.**3-29 Semiparametric estimation of censored selection models with a nonparametric selection mechanism***by*Ahn, Hyungtaik & Powell, James L.**31-48 How sensitive are average derivatives?***by*Hardle, Wolfgang & Tsybakov, A. B.**49-70 Semiparametric estimation of a work-trip mode choice model***by*Horowitz, Joel L.**121-136 Dynamic choice in social settings : Learning from the experiences of others***by*Manski, Charles F.**137-168 Nonparametric identification and estimation of polychotomous choice models***by*Matzkin, Rosa L.**169-184 Efficiency bounds for some semiparametric selection models***by*Newey, Whitney K. & Powell, James L.**185-205 On the computation of semiparametric estimates in limited dependent variable models***by*Pinkse, C. A. P.**207-222 Nonparametric bootstrap confidence intervals for discrete regression functions***by*Rodriguez-Campos, M. C. & Cao-Abad, R.**223-256 Semiparametric quasilikelihood and variance function estimation in measurement error models***by*Sepanski, J. H. & Carroll, R. J.**257-274 Some efficiency bounds for semiparametric discrete choice models***by*Scott Thompson, T.

### 1993, Volume 57, Issue 1-3

**1-19 Quadratic mode regression***by*Lee, Myoung-jae**21-51 The impact of training on the frequency and duration of employment***by*Gritz, R. Mark**53-68 Estimating long-run relationships in economics : A comparison of different approaches***by*Inder, Brett**69-89 Measuring the unidentified parameter of the extended Roy model of selectivity***by*Vijverberg, Wim P. M.**91-115 Structural duration analysis of management data***by*Ryu, Keunkwan**117-136 Robustness to nonnormality of the Durbin-Watson test for autocorrelation***by*Ali, Mukhtar M. & Sharma, Subhash C.**137-160 Higher-order sample autocorrelations and the unit root hypothesis***by*Bierens, Herman J.**161-188 Coherency and regularity of demand systems with equality and inequality constraints***by*Soest, Arthur van & Kapteyn, Arie & Kooreman, Peter**189-203 Another look at the evidence on money-income causality***by*Friedman, Benjamin M. & Kuttner, Kenneth N.**205-232 A comparison of nonnested tests for misspecified models using the method of approximate slopes***by*Zabel, Jeffrey E.**233-255 Testing for autoregressive disturbances in a time series regression with missing observations***by*Shively, Thomas S.**257-276 Modified three-stage least squares estimator which is third-order efficient***by*Morimune, Kimio & Sakata, Shinichi**277-318 Tests of specification for parametric and semiparametric models***by*Whang, Yoon-Jae & Andrews, Donald W. K.**319-343 A nonnested approach to testing continuous time models against discrete alternatives***by*Chambers, Marcus J.**345-363 Robust bayesian inference in elliptical regression models***by*Osiewalski, Jacek & Steel, Mark F. J.**365-376 Alternative point-optimal tests for regression coefficient stability***by*Brooks, Robert D.**377-392 A simulation approach to the problem of computing Cox's statistic for testing nonnested models***by*Hashem Pesaran, M. & Pesaran, Bahram**393-406 Testing linear restrictions on coefficients in a linear regression model with proxy variables and spherically symmetric disturbances***by*Ohtani, Kazuhiro & Giles, Judith

### 1993, Volume 56, Issue 3

**269-290 Testing for neglected nonlinearity in time series models : A comparison of neural network methods and alternative tests***by*Lee, Tae-Hwy & White, Halbert & Granger, Clive W. J.**291-321 Distribution theory for the analysis of binary choice under uncertainty with nonparametric estimation of expectations***by*Ahn, Hyungtaik & Manski, Charles F.**323-340 Bayesian analysis of logit models using natural conjugate priors***by*Koop, Gary & Poirier, Dale J.**341-355 A pseudo-R2 measure for limited and qualitative dependent variable models***by*Laitila, Thomas**357-370 Calculating the (local) semiparametric efficiency bounds for the generated regressors problem***by*Rilstone, Paul**371-396 Exogeneity tests in a truncated structural equation***by*Tsurumi, Hiroki & Mehr, Peter**397-440 Maximum entropy estimation of density and regression functions***by*Ryu, Hang K.**441-445 A note on multiple roots of the Tobit log likelihood***by*Iwata, Shigeru

### 1993, Volume 56, Issue 1-2

**1-3 Editors' introduction***by*Hsiao, Cheng & Ruud, Paul**5-37 Stochastic linear trends : Models and estimators***by*Maravall, Agustin**39-56 Time series properties of aggregate output fluctuations***by*Durlauf, Steven N.**57-88 Persistence, cointegration, and aggregation : A disaggregated analysis of output fluctuations in the U.S. economy***by*Pesaran, M. H. & Pierse, R. G. & Lee, K. C.**89-118 Bayesian and non-Bayesian methods for combining models and forecasts with applications to forecasting international growth rates***by*Min, Chung-ki & Zellner, Arnold**119-139 Testing superexogeneity and invariance in regression models***by*Engle, Robert F. & Hendry, David F.**141-168 Minimum chi-square estimation and tests for model selection***by*Vuong, Quang H. & Wang, Weiren**169-188 Some aspects of measurement error in a censored regression model***by*Weiss, Andrew A.**189-217 Simultaneous equations for hazards : Marriage duration and fertility timing***by*Lillard, Lee A.**219-242 Experimental estimates of the impact of wage subsidies***by*Dubin, Jeffrey A. & Rivers, Douglas**243-267 Econometric issues of estimating hedonic price functions : With an application to the U.S. market for automobiles***by*Arguea, Nestor M. & Hsiao, Cheng

### 1993, Volume 55, Issue 1-2

**1-8 Editor's introduction : Seasonality and econometric models***by*Ghysels, Eric**9-19 Rational expectations modeling with seasonally adjusted data***by*Sims, Christopher A.**21-55 Seasonality and approximation errors in rational expectations models***by*Hansen, Lars Peter & Sargent, Thomas J.**57-98 The effect of seasonal adjustment filters on tests for a unit root***by*Ghysels, Eric & Perron, Pierre**99-103 Discussion : The effect of seasonal adjustment filters on tests for a unit root***by*Diebold, Francis X.**105-128 The importance of seasonality in inventory models : Evidence from business survey data***by*Nerlove, Marc & Ross, David & Willson, Douglas**129-133 The importance of seasonality in inventory models***by*Dufour, Jean-Marie**135-168 Induced seasonality and production-smoothing models of inventory behavior***by*Krane, Spencer D.**169-172 Induced seasonality and production-smoothing models of inventory behavior***by*Hall, Alastair**173-200 Forecasting time series with common seasonal patterns***by*Canova, Fabio**201-202 Forecasting time series with common seasonal patterns***by*Geweke, John**203-229 Seasonal BVAR models : A search along some time domain priors***by*Raynauld, Jacques & Simonato, Jean-Guy**231-234 Discussion : Seasonal BVAR models***by*Zellner, Arnold**235-265 The effect of sampling error on the time series behavior of consumption data***by*Bell, William R. & Wilcox, David W.**267-273 The effect of sampling error on the time series behavior of consumption data***by*Gregory, Allan W. & Wirjanto, Tony**275-298 The Japanese consumption function***by*Engle, R. F. & Granger, C. W. J. & Hylleberg, S. & Lee, H. S.**299-303 Seasonal cointegration***by*Osborn, Denise R.**305-328 Seasonal unit roots in aggregate U.S. data***by*Joseph Beaulieu, J. & Miron, Jeffrey A.**329-331 Seasonal unit roots in aggregate U.S. data***by*Dickey, David A.**333-351 Dynamic linear models for time series components***by*Dagum, Estela Bee & Quenneville, Benoit**353-356 Dynamic linear models for time series components***by*Findley, David F.

### 1992, Volume 54, Issue 1-3

**1-47 Maximum likelihood inference on cointegration and seasonal cointegration***by*Lee, Hahn Shik**49-78 Tests of overidentification and predeterminedness in simultaneous equation models***by*Anderson, T. W. & Kunitomo, Naoto**79-93 Discrete/continuous models of consumer demand with binding nonnegativity constraints***by*Chiang, Jeongwen & Lee, Lung-Fei**95-120 Monte Carlo results on several new and existing tests for the error component model***by*Baltagi, Badi H. & Chang, Young-Jae & Li, Qi**121-138 Testing and estimating location vectors when the error covariance matrix is unknown***by*Griffiths, William & Judge, George**139-158 Heteroskedastic cointegration***by*Hansen, Bruce E.**159-178 Testing the null hypothesis of stationarity against the alternative of a unit root : How sure are we that economic time series have a unit root?***by*Kwiatkowski, Denis & Phillips, Peter C. B. & Schmidt, Peter & Shin, Yongcheol**179-201 Quasi-Aitken estimation for heteroskedasticity of unknown form***by*Cragg, John G.**203-222 Regression-based methods for using control variates in Monte Carlo experiments***by*Davidson, Russell & MacKinnon, James G.**223-250 Testing for a unit root in time series using instrumental variable estimators with pretest data based model selection***by*Hall, Alastair