Converting dates entered as strings into numeric dates that can be used by Stata is relatively simple. The commands vary somewhat based on the format in which the data were…
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When analyzing survey data, it is common to want to look only a certain respondents, perhaps only women, or only respondents over age 50.  When analyzing these subpopulations (AKA domains), you need…
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Collinearity is a property of predictor variables and in OLS regression can easily be checked using the estat vif command after regress or by the user-written command, collin (see How can…
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There is no svy: ttest command in Stata; however, svy: mean is an estimation command and allows for the use of both the test and lincom post-estimation commands. It is…
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First off, let’s start with what a significant three-way interaction means. It means that there is a two-way interaction that varies across levels of a third variable. Say, for example,…
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First off, let’s start with what a significant three-way interaction means. It means that there is a two-way interaction that varies across levels of a third variable. Say, for example,…
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First off, let’s start with what a significant three-way interaction means. It means that there is a two-way interaction that varies across levels of a third variable. Say, for example,…
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Let’s begin with with what a significant three-way interaction means. It means that there is a two-way interaction that varies across levels of a third variable. Say, for example, that…
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This page is Part 2 of a two-page sequence. If you have reached here without reading the first part you should go back because there is a lot of explanitory…
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This page is Part 2 of a two-page sequence. If you have reached here without reading the first part you should go back because there is a lot of explanitory…
Read More