NEWSIMPACT: Stata module to compute news impact curve for ARCH models
newsimpact is for use after arch. It plots the news impact curve, the response in the conditional variance, sigma^2(t), to an innovation in the standardized error term, z(t-1). When calculating the response in sigma^2(t) historical conditional variances (sigma^2(t-i), i > 0) are set to sigma^2 and historical error terms (z(t-i), i > 1) are set to 1. The default value for sigma^2 is an estimate of the unconditional variance, the mean of the estimated conditional variances. Finally error terms that enter in the conditional variance formula are obtained as e(t) = sigma*z(t).
|Requires:||Stata version 9|
|Date of creation:||07 Apr 2008|
|Date of revision:|
|Note:||This module should be installed from within Stata by typing "ssc install newsimpact". 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|
Web page: http://fmwww.bc.edu/EC/
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|Order Information:||Web: http://repec.org/docs/ssc.php|
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