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06-05-2013 07:08 PM

Hi all, I've been trying to make a graph using PROC UNIVARIATE, however I couldn't understand why is not possible show de first, second and the third standart desviation as the image below:

How can I show the S.D like the image above, using proc UNIVARIATE ?

tk's in advanced.

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Solution

06-06-2013
11:44 AM

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Posted in reply to Abud

06-06-2013 11:44 AM

Starting with SAS 9.3m2, PROC UNIVARIATE enables you to place reference lines at the values of selected statistics, including multiples of the sample standard deviation. Here is some code and output. I have specified a list of bin midpoints so all the reference lines are displayed. (Axis ranges are not extended automatically to include reference lines.)

data foo;

do i = 1 to 100;

x = 10 + rannor(123);

output;

end;

run;

proc univariate data=foo noprint;

histogram x /

normal(noprint)

statref= -3std -2std -1std mean 1std 2std 3std

statreflabel= "-3 S.D" "-2 S.D" "-1 S.D" "" "1 S.D" "2 S.D" "3 S.D"

midpoints= 7 to 13 by 1

nocurvelegend;

run;

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Posted in reply to Abud

06-05-2013 07:46 PM

This is a custom graph, that you can make with SAS 9.3. Use PROC MEANS to get all the statistics you need and merge with original data used for histogram.

You can use SGPLOT procedure to create the histogram, and use REFLINE statement to overlay the lines for the SD values. then, you can annotate the rest of the formation.

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Posted in reply to Sanjay_SAS

06-06-2013 08:55 AM

Hi Sanjay, could you send me a example ?

Doesn't SAS have a function to know the "z-scores" ?

Solution

06-06-2013
11:44 AM

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Posted in reply to Abud

06-06-2013 11:44 AM

Starting with SAS 9.3m2, PROC UNIVARIATE enables you to place reference lines at the values of selected statistics, including multiples of the sample standard deviation. Here is some code and output. I have specified a list of bin midpoints so all the reference lines are displayed. (Axis ranges are not extended automatically to include reference lines.)

data foo;

do i = 1 to 100;

x = 10 + rannor(123);

output;

end;

run;

proc univariate data=foo noprint;

histogram x /

normal(noprint)

statref= -3std -2std -1std mean 1std 2std 3std

statreflabel= "-3 S.D" "-2 S.D" "-1 S.D" "" "1 S.D" "2 S.D" "3 S.D"

midpoints= 7 to 13 by 1

nocurvelegend;

run;

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Posted in reply to BuckyRansdell

06-06-2013 12:06 PM

Hi, Bucky, first of all thank's for the tip, it was exactly what I'm trying to do, however, my SAS is 9.2.