haif calculates homoskedastic adjustment inflation factors (HAIFs) for core variables in the corevarlist, caused by adjustment by the additional variables specified by addvars(). HAIFs are calculated for the variances and standard errors of estimated linear regression parameters corresponding to the core variables. For each variance (or standard error), the HAIF is defined as the ratio between that variance (or standard error) of that parameter, in a model containing both the core variables and the additional variables, to the corresponding variance (or standard error) of the same parameter, in a model containing only the core variables, calculated assuming that the second model is true, and also assuming that the outcome variable is homoskedastic (meaning that it has equal variances in all subpopulations defined by the predictor variables). haifcomp calculates the ratios between the HAIFs for the same core variables caused by adjustment for two alternative lists of additional variables, namely a numerator list and a denominator list. haif and haifcomp are intended for use in model selection, allowing the user to choose a model based on the joint distribution of the exposures and confounders, before estimating the parameters of the model from the data on the outcome variable.
Download Info
To download:
If you experience problems downloading a file, check if you have the
proper application to
view it first. Information about this may be contained
in the File-Format links below. In case of further problems read
the IDEAS help
page. Note that these files are not on the IDEAS
site. Please be patient as the files may be large.
Publisher Info
Software component provided by Boston College Department of Economics in its series Statistical Software Components with number
S457016.
Size: Programming language: Stata Requires: Stata version 11.0 Date of creation: 16 Mar 2009 Date of revision:
04 Aug 2009 Handle: RePEc:boc:bocode:s457016
Note: This module may be installed from within Stata by typing "ssc install haif". Windows users should not attempt to download these files with a web browser. Contact details of provider: Postal: Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA Phone: 617-552-3670 Fax: +1-617-552-2308 Email: Web page: http://fmwww.bc.edu/EC/ More information through EDIRC