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I've used R's empirical cumulative distribution function (ecdf) to generate a chart that shows the cumulative probability of some cost data. I want to know if the heading of the chart is correct or can I look at it as a percentile chart? For example, could I say that 66% of members spend $500 or less with a heading like "FY 13/14 Percentage of members that incur costs at or below the specified value".

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    $\begingroup$ You got it! I wonder if flipping the axes will be more informative for your audience, but that's just a matter of swapping the arguments to plot. $\endgroup$
    – Dave
    Commented Jan 29, 2020 at 17:00
  • $\begingroup$ Thank you. Could I change the y-axis label to "Percentage", to relate it to the main heading, which is "FY 13/14 Percentage of members that incur costs at or below the specified value" $\endgroup$
    – Angus
    Commented Jan 29, 2020 at 18:22
  • $\begingroup$ "Percentage of what?" I would wonder. $\endgroup$
    – Dave
    Commented Jan 29, 2020 at 19:03
  • $\begingroup$ Percentage of Members $\endgroup$
    – Angus
    Commented Jan 29, 2020 at 19:17
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    $\begingroup$ Probability ranges from 0 to 1, percent from 0 to 100%. You can change what you like so long as the axis title (label) and values are consistent. I am with Dave: I prefer values on the vertical axis and probability on the horizontal axis (quantile plot). $\endgroup$
    – Nick Cox
    Commented Jan 29, 2020 at 20:03

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