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51. Saving one or more parts of a dataset
     How can I save one or more parts of a large dataset?

52. Reading fixed-format data with infile
     How do I use infile to read in fixed-format data?

53. Stata 5: Avoiding “too many variables” when using reshape
     Stata 5: Why does reshape give a too-many-variables error?

54. Replacing missing values
     How can I replace missing values with previous or following nonmissing values or within sequences?

55. Chi-squared test for models estimated with robust standard errors
     How do the ML estimation commands (e.g., logit and probit) compute the model chi-squared test when
     they estimate robust standard errors on clustered data?

56. The destring command
     Why doesn’t the destring command in Stata include an encode option?

57. 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?

58. stsetting spell-type data
     How do I convert my spell-type data into a survival dataset?

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

60. How Excel writes empty cells
     Why do I get the error "wrong number of values" when I use insheet to read data from Excel?



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