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Jann, Ben (2009). Stata tip 44: Get a handle on your sample. In: Newton, Joseph H.; Cox, Nicholas J. (eds.) Seventy-six Stata Tips, 2nd Edition (pp. 85-86). College Station, Texas: Stata Press
Jann, Ben (2009). Stata tip 8: Splitting time-span records with categorical time-varying covariates. In: Newton, Joseph H.; Cox, Nicholas J. (eds.) Seventy-six Stata Tips, 2nd Edition (pp. 11-12). College Station, Texas: Stata Press
