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21. The variance function in nbreg
     How do you specify the variance function in nbreg to coincide with Cameron and Trivedi’s
     (Regression Analysis of Count Data, page 62) NB1 and NB2 variance functions?

22. Testing for panel-level heteroskedasticity and autocorrelation
     How do I test for panel-level heteroskedasticity and autocorrelation?

23. Resampling and missing values
     Why does bootstrap give a warning message for non-eclass commands?

24. Chow and Wald tests
     Does test after estimating with regress, vce(robust) perform a Chow test?

25. Testing the equality of coefficients across independent areas
     How do you test the equality of regression coefficients that are generated from two different
     regressions, estimated on two different samples?

26. Small-sample adjustments to the sandwich estimate of variance
     What are some of the small-sample adjustments to the sandwich estimate of variance?

27. Stata 5: Goodness-of-fit chi-squared test reported by poisson
     Stata 5: Why does the goodness-of-fit chi-squared test reported by poisson change when the counts
     and exposures are grouped differently?

28. Problems with stepwise regression
     What are some of the problems with stepwise regression?

29. Do-it-yourself R-squared
     How can I get an R-squared value when a Stata command does not supply one?

30. One-sided tests for coefficients
     The results from estimation commands display only two-sided tests for the coefficients. How can I
     perform a one-sided test?



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