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st: wald test and ivreg


From   "Amess, Dr K.M." <kma11@leicester.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: wald test and ivreg
Date   Mon, 3 Nov 2003 22:01:40 -0000

Dear all,

I am using the -ivreg- command with the "robust cluster(i) small" options. Because I have used the small option t-stasticis are specified that are robust to general forms of heteroscedasticity and within correlation. Additionally, the -test- command invokes an F-test of my specified restrictions.

Would it be better to use a Wald test of restrictions I want to test as the F-test is not valid in the presence of heteroscedasticity or is the F-test robust in the same way as the t-statistic is robust due to robust standard errors being used?

Is there a way of telling Stata to conduct a Wald test even when the default is to conduct an F-test after the 'small' option is used in the previously estimated model?

Thanks for help in advance.
Kevin

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