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41. Going through groups in order of first occurrence
     How do I go through the groups of a variable in order of their first occurrence in the dataset?

42. Dealing with reports of repeated time values within panel
     How do I deal with a report of repeated time values within panel?

43. Stata 5: Creating date variables
     Stata 5: How do I make date variables?

44. Putting leading zeros in output
     Is there a way to put leading zeros in output?

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

46. Dealing with very large datasets
     How do you process very large datasets in Stata?

47. 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?

48. Cox regression results in Stata versus SAS
     Why do the results for cox and stcox not match SAS PHREG?

49. Calculate percentiles with survey data
     How do I obtain percentiles for survey data?

50. Conditional logit model and clogit
     I am running clogit and get the message "Note: multiple outcomes within groups encountered." Is this
     something I should worry about or is this a normal message?"



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