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31. Within group collinearity in conditional logistic regression
     Why does clogit sometimes report a coefficient but missing value for the standard error, confidence
     interval, etc.?

32. Pooling data and performing Chow tests in linear regression
     How can I pool data (and perform Chow tests) in linear regression without constraining the residual
     variances to be equal?

33. A comparison of different tests for trend
     Does Stata provide a test for trend?

34. Estimation commands and omitted variables
     Why do estimation commands sometimes omit variables?

35. Stepwise regression with the svy commands
     Is there a way in Stata to do stepwise regression with svy: logit or any of the svy commands?

36. The appropriate command for matched case-control data
     Can I do n:1 matching with the mcc command?

37. Weighted estimation and xtgee
     Why must weights be constant within panel for xtgee?

38. The divisor choice in xtgee
     What are the divisors used in xtgee?

39. Bootstrapping vectors
     How do I bootstrap a vector of results?

40. Creating variables that are “plurality” measures
     How do I calculate measures such as percent improved minus percent deteriorated?



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