Software Updates

pr0041_4: Correlation with confidence, or Fisher’s z revisited. N. J. Cox. Stata Journal 20: 1028–1029; 17: 779; 10: 691; 8: 413–439.

The update improves explanation of the format() option and fixes a bug concerning saving results to a new dataset.

st0389_7: Conducting interrupted time-series analysis for single- and multiple-group comparisons. A. Linden. Stata Journal 21: 556–557; 17: 1024; 17: 515–516; 17: 73–88; 16: 813–814; 16: 521–522; 15: 480–500.

Fixed an error with the trperiod() loop.

Added parsing code to extract date(s) from trperiod().

Fixed the code to handle depvar when using time-series operators (for example, L.depvar).

st0534_2: mstatecox: A package for simulating transition probabilities from semiparametric multistate survival models. S. K. Metzger and B. T. Jones. Stata Journal 19: 748–751; 18: 533–563.

This update has four major changes:

mstsample now correctly generates transition probabilities from Cox models with frailties, an offset, or both.

mstsample will now return more stable transition probability estimates from Cox models with tvc() variables.

mstphtest now correctly refits the stratum-specific models when the original specification has an offset.

mstphtest had some extraneous code that temporarily overrode the variance and covariance estimates for the original Cox model in certain situations, leading to potentially misleading proportional-hazards–related conclusions. This is no longer the case.

We recommend you install this update immediately. The relevant help files have also been updated to reflect the changes where needed.