Warping the frequency axis violates that principle. The key principle to a histogram is that bar area has a direct interpretation as probability or frequency. Stata's result that puzzled you is best interpreted as a signal implying that your request is inconsistent with how histograms work. If you ask for log scale, that isn't banned but it makes no sense to Stata as Stata always tries to start the bars at zero. The people who wrote the histogram commands agree with that opinion of mine. Providing you realise that and that is what you want, then so be it.įor all that you can find examples in published literature, bars on a logarithmic scale (so that there is an arbitrary base to the bars) are to me graphically obnoxious. Taking logarithms maps your zeros to missing and omits them from any display thereafter. Values of zero are inconsistent with a logarithmic scale.
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