Time invariant factors are ignored since there are so many that we can't quantify. One issue is that pressure measurements (a key variable) are only available for 42 zones and are severely unbalanced. My covariates consist of various time-varying factors specific to each zone, like water demand, pressure measurements, etc. My data is longitudinal, with 128 "zones" and around 700 daily observations for whether or not a pipe break has occurred on that day. Stata/MP 14.2 and my installation does not have internet access, so I cannot copy code or output to this forum.
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