topic Re: Histogram based on IQR in Graphics Programming

Histogram based on IQR

simkinm2 — Wed, 18 Jul 2018 19:23:56 GMT

I'd like to create histograms for about 50 continuous variables with bins based on the <25th percentile, 25th-50th percentile, 50th-75th percentile, and > 75th percentile. Is there a way to do this with proc univariate?

Re: Histogram based on IQR

PaigeMiller — Wed, 18 Jul 2018 19:27:04 GMT

The pre-programmed histograms in SAS don't allow you to set bin limits at 25 percentile, 50 percentile, 75 percentile and so on. With some programming I think you could make that happen.

Of course, a box plot sounds exactly like what you are talking about, it shows 25 percentile, 50 percentile, 75 percentile and other statistics, and allows you to compare the "distributions" (as displayed by the boxplot) of 50 variables visually.

Re: Histogram based on IQR

simkinm2 — Wed, 18 Jul 2018 19:42:09 GMT

That's what I thought...I started programming these IQRs for some frequency distributions along with the histograms and hoped there was an easier way!

Thanks!

Re: Histogram based on IQR

simkinm2 — Wed, 18 Jul 2018 19:46:09 GMT

Meant to say along with the box plots

Re: Histogram based on IQR

ballardw — Wed, 18 Jul 2018 20:28:53 GMT

You might find this example helpful: http://support.sas.com/kb/35/171.html

Go to the Results Tab to see the graph, the Full code has the Proc Template code and uses a standard SAS data set to display.

It has an extra element of a small fringe plot to provide a little more detail of distribution that the bare histogram provides.

Re: Histogram based on IQR

Reeza — Thu, 19 Jul 2018 21:49:15 GMT

In a histogram the bins based on percentiles would produce a flat line, wouldn’t it?

Perhaps you mean something different?

@simkinm2 wrote:

I'd like to create histograms for about 50 continuous variables with bins based on the <25th percentile, 25th-50th percentile, 50th-75th percentile, and > 75th percentile. Is there a way to do this with proc univariate?