Abstract
Stata tip 140: Shorter or fewer category labels with graph bar
Highlights
The difficulties discussed in this tip arise most commonly with graph bar, but if the solutions help with the other commands, that is fine
The general problem addressed in this tip is that you are using graph bar and your categorical axis labels are a mess
264 The immediate stimulus for this tip was a thread on Statalist, Stata tip 140 https://www.statalist.org/forums/forum/general-stata-discussion/general/ 1565227-graph-bar-over-year-how-to-shorten-displayed-year-labels which started on 24 July 2020
Summary
Stata does not have the concept of a categorical variable, but statistical people do, as shown by many book titles alone (for example, Fienberg [1980]; Lloyd [1999]; Simonoff [2003]; Tutz [2012]; Agresti [2013]; Long and Freese [2014]). The difficulties discussed in this tip arise most commonly with graph bar, but if the solutions help with the other commands, that is fine Those difficulties arise often with predictor variables that a researcher would not think of as categorical at all. You would not want to have to edit a series of options naming x-axis properties to the corresponding y-axis properties, and which is what graph twoway often requires if you change axes. The example in this thread of a bar chart for time series raises just about all the generic issues that arise commonly. The default that every predictor value—every distinct category—is matched by an explicit text label is not always what you want for time series
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