topic Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator in Graphics Programming

Graphing a frequency distributions chart to compare manipulator and non-manipulator

Terrencefung — Wed, 23 Nov 2016 20:15:01 GMT

Hi,

I would like to graph a frequency distributions chart to compare the distribution of manipulator and non-manipulator.

However, the frequency of manipulator is really small, so i want to multiply a number on the frequency of distrubution for manipulator in order to allow easier visual comparison with the much larger sample of non-manipulator.

I use proc sgplot. How can I make it work?

Thank you very much for your help.

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Rick_SAS — Wed, 23 Nov 2016 21:10:56 GMT

Instead of multiplying, plot both histograms or bar charts on the percentage scale. For example, this is how you can plot percentage of males and females on the same bar chart:

proc sgplot data=sashelp.class;
vbar age / group=sex stat=percent groupdisplay=cluster;
run;

If you have a continuous variable, you can use comparative histograms to compare the distribution across groups.

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Terrencefung — Wed, 23 Nov 2016 21:14:57 GMT

Thank you very much for your prompt response. But it has to be the frequency scale. D you know how to do it? thank you

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Rick_SAS — Wed, 23 Nov 2016 21:29:28 GMT

I don't understand why you say "it has to be the frequency scale." To compare absolute counts, plot the data on the count scale. To compare the relative proportions, plot on the percentage scale.

Do you have some sampling scheme in which you oversampled one category? For example, does each male in your data represent 10 members of the population but each female represents 100? Even then, I think plotting proportions are the way to go.

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Terrencefung — Wed, 23 Nov 2016 21:38:24 GMT

Hi Rick,

Sorry for making you confuse.
I have matched one manipulator to five non-manipulator, and i need to graph a frequency distribution char to compare the difference of ditribution between manipulator and non-manipulator.

Please find the attached figure. I need to do the same thing as the enclosed figure.

Thank you very much for your help.

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Rick_SAS — Wed, 23 Nov 2016 21:43:52 GMT

Well, I still don't like it, but you can do it by using a FREQ variable. Here is an example in which each female in the data set represents 5 females:

data FakeData;
set sashelp.class;
if sex="F" then freq=5;
else freq=1;
run;

proc sgplot data=FakeData;
vbar age / group=sex freq=freq groupdisplay=cluster;
run;

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Terrencefung — Wed, 23 Nov 2016 21:50:43 GMT

Thank you for your help, though it is still different from what i need.

Regards,

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Rick_SAS — Wed, 23 Nov 2016 22:03:52 GMT

If you want a line instead of bars, just use the VLINE statement instead of VBAR.

If you have a continuous variable, use the DENSITY statement.

If you post some sample data, I'm sure that someone can give you what you need.

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Terrencefung — Wed, 23 Nov 2016 23:45:41 GMT

Thank you. the following is the sample data. i want to compare the difference of distribution (frequency) of Estimated probability between em=1 and em=0.

Global Company	Data Year -	em	Estimated Probability
Key	Fiscal


1173	1999	1	0.50883
137377	1999	0	0.53093
1173	1999	1	0.50883
31015	1999	0	0.36718
1173	1999	1	0.50883
8388	1999	0	0.45892
1173	1999	1	0.50883
133729	1999	0	0.52904
1173	1999	1	0.50883
61553	1999	0	0.6904
1173	2000	1	0.48688
63038	2000	0	0.53392
1173	2000	1	0.48688
26038	2000	0	0.67335
1173	2000	1	0.48688
15758	2000	0	0.56561
1173	2000	1	0.48688
62874	2000	0	0.49828
1173	2000	1	0.48688
143526	2000	0	0.48667
1173	2001	1	0.48896
15758	2001	0	0.43567
1173	2001	1	0.48896
2299	2001	0	0.4265
1173	2001	1	0.48896
24982	2001	0	0.52106
1173	2001	1	0.48896

Re: Graphing a frequency distributions chart to compare manipulator and non-manipulator

Rick_SAS — Thu, 24 Nov 2016 11:49:25 GMT

If you want a kernel density estimate of the FREQ variable, you can use

proc sgplot data=em;
density freq / type=kernel group=em;
run;

If you want to form a histogram, but plot the frequencies as a series, you can use PROC UNIVARIATE to bin the data and the SERIES statement to plot the binned frequencies:

proc univariate data=em noprint;
class em;
histogram freq  / outhist=out
            midpoints=(0 to 0.8 by 0.05);
run;

proc sgplot data=out;
series x=_midpt_  y=_count_ / group=em;
run;