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Error bars in ErrorPlot

DJKeenan 442
July 12 2007
0
In statistical analyses, it is common to fit a model to data where, say, the x-coordinates are known exactly and the y-coordinates are known inexactly, with some assumed error distribution. It is often useful to plot the data, with bars indicating the std. deviation (say) of the potential error in the y-coordinates. Maple's Statistics package has a procedure for doing that: ErrorPlot. ErrorPlot, however draws error bars horizontally, instead of vertically. I do not understand this, especially as the Help seems to indicate that the errors are in the y-coordinates, as usual in statistics. Why are ErrorPlot error bars drawn horizontally? Note that BoxPlot draws error bars/boxes vertically, as expected.
coordinates plot package statistics

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