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Jann, Ben (2014). Stata tip 44: Get a handle on your sample. In: Cox, Nicholas J.; Newton, H. Joseph (eds.) One Hundred Nineteen Stata Tips, Third Edition (pp. 84-85). College Station, Texas: Stata Press
Jann, Ben (2014). Stata tip 8: Splitting time-span records with categorical time-varying covariates. In: Cox, Nicholas J.; Newton, H. Joseph (eds.) One Hundred Nineteen Stata Tips, Third Edition (pp. 11-12). College Station, Texas: Stata Press
Jann, Ben (2006). Stata tip 8: Splitting time-span records with categorical time-varying covariates. In: Newton, H. Joseph; Cox, Nicholas J. (eds.) Thirty-three Stata Tips (pp. 11-12). College Station, Texas: Stata Press
