Programming the statistical procedures from SAS

Perform ANOVA and multiple comparisons with PROC surveymeans and more

Accepted Solution Solved
Reply
Contributor
Posts: 32
Accepted Solution

Perform ANOVA and multiple comparisons with PROC surveymeans and more

Dear All:

I do need helps with how to use both PROC surveyfreq and PROC surveymeans to do the following analysis.

I really thank you all for your helps.


I have the following variables:


Stratum1 (1,2)


Months (0,1,2)


X1 (1=yes,2=No) ---- nominal categorical


X2  ------ interval continuous


Weight1  ---- weight variable


I need


(1) to test the equality of proportions of ones in months (0,1,2), and conduct a multiple comparison test for these proportions.


(2) to test the equality of the averages in months(0,1,2) and conduct a multiple comparison test for these means.


(3) test for trend: for example if there is increasing or decreasing in averages (X2), if there is increasing or decreasing in proportions of ones (X1).

Any helps will be appreciated.


Please email me copy of your answer.


With many thanks

Steve

Email: sstoline@gmail.com


data1--- as an example

=============================

X2    X1    stratum1    months    weight1

29.4822    2    2    0    16.61921705

33.2849    2    2    0    16.61921705

16.9370    1    1    0    2.09612124

19.0055    1    1    0    2.09612124

21.1151    1    2    0    16.61921705

25.4055    2    2    0    16.61921705

24.4164    1    1    0    1.56167161

19.0767    1    1    0    1.56167161

23.1562    2    1    0    2.09612124

23.3479    1    1    0    2.09612124

21.7370    1    1    0    2.09612124

24.9726    2    2    0    16.61921705

20.3836    1    2    0    16.61921705

20.0575    1    2    0    20.88637405

17.6603    1    2    0    16.61921705

25.2274    2    2    0    16.61921705

20.9644    1    1    0    2.09612124

32.8055    2    2    0    14.51497509

39.5233    2    1    0    1.56167161

17.7288    1    1    1    2.09612124

18.3096    1    2    1    16.61921705

25.8055    2    2    1    16.61921705

30.0904    1    2    1    16.61921705

27.8082    2    1    1    2.09612124

37.3863    2    1    1    2.09612124

26.2548    2    1    1    2.09612124

17.8795    1    2    1    20.88637405

19.8000    1    2    1    16.61921705

28.6932    2    1    1    1.56167161

27.1041    2    2    1    16.61921705

36.1836    2    2    1    16.61921705

19.8192    1    1    1    2.09612124

31.9644    2    2    1    20.88637405

27.0740    1    1    1    2.09612124

23.5288    2    1    1    2.09612124

21.9068    1    2    1    14.51497509

20.3534    1    2    1    16.61921705

29.4767    2    2    1    14.51497509

22.8274    1    2    1    16.61921705

21.2685    1    2    1    20.88637405

31.8932    1    1    1    1.56167161

31.8795    2    1    1    2.09612124

21.2630    2    1    1    2.09612124

18.7562    2    1    1    2.09612124

16.8822    1    2    1    20.88637405

22.0164    2    2    2    20.88637405

27.4959    2    1    2    2.09612124

27.4904    2    1    2    1.56167161

2.7096    2    2    2    14.51497509

23.0027    1    2    2    16.61921705

19.2767    1    2    2    16.61921705

30.4466    1    2    2    16.61921705

36.5425    2    2    2    16.61921705

32.2521    2    1    2    1.56167161

36.9534    1    2    2    14.51497509

30.4164    2    2    2    14.51497509

20.2767    2    1    2    2.09612124

17.2356    1    2    2    20.88637405

20.8247    2    2    2    16.61921705

20.8795    1    2    2    16.61921705

27.5260        2    2    16.61921705

19.2493    1    2    2    16.61921705

17.8521    1    2    2    16.61921705

19.6822    1    2    2    16.61921705

36.8356    2    1    2    1.5616716


Accepted Solutions
Solution
‎06-17-2013 10:28 AM
Respected Advisor
Posts: 2,655

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Steven,

I think the only way to get a plot of just the percents of ones would be to use ODS Output, and PROC SGPLOT.

ods graphics on;

ods output wtfreqplot=wtfreqplot;

proc surveyfreq data = data1;

strata stratum1;

weight weight1;

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot); /* BARCHART */

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent); */

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot orient=vertical); */

table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot orient=vertical);

run;

proc sgplot data=wtfreqplot;

where _column='1';

  highlow x=_row high=u_percent low=l_percent

    / close=_percent legendlabel="Percent";

  series x=_row y=_percent;

  xaxis label='Month';

  yaxis label='Percent';

run;

The bolded part gives a plot that I think looks something like what you want.  Unfortunately, I can't figrue out how to suppress the two legends so as to give only one.  Maybe someone else can do that.

Steve Denham

View solution in original post


All Replies
Respected Advisor
Posts: 2,655

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Well, rather than SURVEYMEANS, I would check out SURVEYREG.  The use of CLASS statments and TEST and LSMESTIMATE statements should go a long way toward giving the answers you are working towards in #2 and #3.  For #1, I assume that X1 would be the dependent variable.  The SURVEYFREQ documentation, especially Example 90.1 should give you the code you need.

Steve Denham

Contributor
Posts: 32

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Dear Steve:

First I really thank you very much for your help.

Clarification:

I am not sure when you said "For #1, I assume that X1 would be the dependent variable". If so, the table statement should look like

table X1*months/ row nowt wchisq;

or

table months*X1/ row nowt wchisq;

many thanks

Steven

Respected Advisor
Posts: 2,655

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

I would go with the latter.  The example (90.1) puts the response as the last variable.

Steve Denham

Contributor
Posts: 32

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Dear Steve:

I tried to use both TEST and LSMESTIMATE statements but I could not make them work. I could not find an example for TEST statement, and I could not make LSMESTIMATE statement. I am wondering if you can help me with a simple code using the above sample data.

thank you very much

steven

Respected Advisor
Posts: 2,655

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Here's a first try.  I don't think you will need the TEST statement.

proc surveyreg data=data1 total=<don't know what to put here, but it is the total number of PSUs that you sampled from, could be in a dataset>;

   strata stratum1;

   class months;

   model X2 = months;

   lsmeans months / diff;

     lsmestimate months "0 v 1" -1 1 0,

                                    '0 v 2'  -1 0 1/adjust= <pick your method for adjustment here>;

     lsmestimate monts 'Linear trend' -1 0 1;

   weight weight1;

run;

This gives the multiple comparison in the first LSMESTIMATE statement, and the linear trend in the second.  I set the total PSU to 640 for my analysis, and used adjust=simulate.  (Oh and I had to modify the data.  In the fifth record from the bottom, there is a missing value, and I had no idea whether it was for X1 or stratum.  I inserted a 2).

Header 1Header 2Header 3Header 4Header 5Header 6Header 7Header 8
EffectLabelEstimateStandard ErrorDFtValuePr > tAdj P
months0 v 1-0.37341.994164-0.190.85210.9760
months0 v 2-1.58432.334664-0.680.49980.7297

Adjustment for multiplicity

  Linear trend (copied without headers)

monthsLinear trend-1.58432.334664-0.680.4998

I hope this helps.

Steve Denham

Message was edited by: Steve Denham

Contributor
Posts: 32

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Dear Steve:

Thank you very much. It helped me a lot.

Few more things:

1- Is there is a way to plot the confidence intervals for means with "PROC surveymeans". If so, I need help with this.

proc surveymeans data = data1;
strata stratum1;
weight weight1;
domain months;
var x2;
run;

2- Same thing with "PROC surveyfreq", is there is a way to plot the confidence Intervals for proportions. Here, also how to get CIs for proportion in the SAS output.

proc surveyfreq data = data1;

strata stratum1;

weight weight1;

table months*x1;

run;

something like:

Error Line Chart: Temperature Plotting

once again, I really thank you very much for all your help.

Steven

Respected Advisor
Posts: 2,655

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Hi Steven,

For SURVEYFREQ, check the PLOTS= option in the TABLES statement.  To get CI's reported/calculated, add the /CL option to the TABLES statement.

For SURVEYMEANS, I would add the PERCENTILES = or  QUANTILES = options in the PROC statement.  Unfortunately, SURVEYMEANS doesn't have an obvious PLOTS= option that I could find anywhere.  You would probably have to use an ODS OUTPUT statement to export the statistics and quantile datasets, then manipulate them some, and finally use PROC SGPLOT.

Or you could use SURVEYREG and do a domain analysis, or a main effects model and use the CL and PLOTS= options in the LSMEANS statement.

Steve Denham

Contributor
Posts: 32

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Dear Steve:

I am able to get the graph of confidence intervals for the means for 11 months in the PROC SURVEYREG. it looks greats, many thanks.

However, I could not got the graph confidence intervals for the percent in the PROC SURVEYFREQ.

I need to get the plot of the graph of confidence intervals of percent of ones in the X1 variables in each months. That is there will be three confidence intervals: CI for percent of ones in X1 in month 0, CI for percent of ones in X1 in month 1, and CI for percent of ones in X1 in month 2.

I am still need help with this part.

Also, if I have 11 month, how to set the test for trend, I could not make it.


Sorry for bothering

many thanks

Steven

Respected Advisor
Posts: 2,655

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Let's do the last first.  For 11 months, a linear trend in the means would be:

LSMESTIMATE months 'Linear trend' -5 -4 -3 -2 -1 0 1 2 3 4 5/cl;

To get the plots in SURVEYFREQ, make sure ODS GRAPHICS ON; precedes the call:

ods graphics on;

proc surveyfreq data = data1;

strata stratum1;

weight weight1;

table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot orient=vertical);

run;

Drawing lines to connect looks like it will require major editing of the plots.  You may want to ask in the Graphics forum for help on that, if it is really needed.

Steve Denham

Contributor
Posts: 32

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Dear Steve:

I think this will be the last thing in this issue (hope so). I tried to use the code you showed me above and I tried my best to play with the plot (option), but it gives me the following graph

Is there is away to just get the graph of the percents of ones in X1 for the three months (0,1,2) in one graph just like the one obtained from PROC SURVEYREG for means shown in my previous post. Also, I could not see what (only) in the plot option added to the plot.

By the way, is it possible to conduct a TREND test in PROC SURVEYFREQ? if so, please let me know how to do it.

once again many thanks

Steven

This what I tried:

data data1;

input X2    X1    stratum1    months    weight1;

datalines;

29.4822    2    2    0    16.61921705

33.2849    2    2    0    16.61921705

16.9370    1    1    0    2.09612124

19.0055    1    1    0    2.09612124

21.1151    1    2    0    16.61921705

25.4055    2    2    0    16.61921705

24.4164    1    1    0    1.56167161

19.0767    1    1    0    1.56167161

23.1562    2    1    0    2.09612124

23.3479    1    1    0    2.09612124

21.7370    1    1    0    2.09612124

24.9726    2    2    0    16.61921705

20.3836    1    2    0    16.61921705

20.0575    1    2    0    20.88637405

17.6603    1    2    0    16.61921705

25.2274    2    2    0    16.61921705

20.9644    1    1    0    2.09612124

32.8055    2    2    0    14.51497509

39.5233    2    1    0    1.56167161

17.7288    1    1    1    2.09612124

18.3096    1    2    1    16.61921705

25.8055    2    2    1    16.61921705

30.0904    1    2    1    16.61921705

27.8082    2    1    1    2.09612124

37.3863    2    1    1    2.09612124

26.2548    2    1    1    2.09612124

17.8795    1    2    1    20.88637405

19.8000    1    2    1    16.61921705

28.6932    2    1    1    1.56167161

27.1041    2    2    1    16.61921705

36.1836    2    2    1    16.61921705

19.8192    1    1    1    2.09612124

31.9644    2    2    1    20.88637405

27.0740    1    1    1    2.09612124

23.5288    2    1    1    2.09612124

21.9068    1    2    1    14.51497509

20.3534    1    2    1    16.61921705

29.4767    2    2    1    14.51497509

22.8274    1    2    1    16.61921705

21.2685    1    2    1    20.88637405

31.8932    1    1    1    1.56167161

31.8795    2    1    1    2.09612124

21.2630    2    1    1    2.09612124

18.7562    2    1    1    2.09612124

16.8822    1    2    1    20.88637405

22.0164    2    2    2    20.88637405

27.4959    2    1    2    2.09612124

27.4904    2    1    2    1.56167161

2.7096     2    2    2    14.51497509

23.0027    1    2    2    16.61921705

19.2767    1    2    2    16.61921705

30.4466    1    2    2    16.61921705

36.5425    2    2    2    16.61921705

32.2521    2    1    2    1.56167161

36.9534    1    2    2    14.51497509

30.4164    2    2    2    14.51497509

20.2767    2    1    2    2.09612124

17.2356    1    2    2    20.88637405

20.8247    2    2    2    16.61921705

20.8795    1    2    2    16.61921705

27.5260    1    2    2    16.61921705

19.2493    1    2    2    16.61921705

17.8521    1    2    2    16.61921705

19.6822    1    2    2    16.61921705

36.8356    2    1    2    1.5616716

;

run;

ods graphics on;

proc surveyfreq data = data1;

strata stratum1;

weight weight1;

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot); /* BARCHART */

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent); */

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot orient=vertical); */

table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot orient=vertical);

run;

ods graphics off;

Solution
‎06-17-2013 10:28 AM
Respected Advisor
Posts: 2,655

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Steven,

I think the only way to get a plot of just the percents of ones would be to use ODS Output, and PROC SGPLOT.

ods graphics on;

ods output wtfreqplot=wtfreqplot;

proc surveyfreq data = data1;

strata stratum1;

weight weight1;

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot); /* BARCHART */

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent); */

/* table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot orient=vertical); */

table months*x1/clwt plots(only)=wtfreqplot(scale=percent type=dotplot orient=vertical);

run;

proc sgplot data=wtfreqplot;

where _column='1';

  highlow x=_row high=u_percent low=l_percent

    / close=_percent legendlabel="Percent";

  series x=_row y=_percent;

  xaxis label='Month';

  yaxis label='Percent';

run;

The bolded part gives a plot that I think looks something like what you want.  Unfortunately, I can't figrue out how to suppress the two legends so as to give only one.  Maybe someone else can do that.

Steve Denham

Contributor
Posts: 32

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

Dear Steve:

Thank you very much for everything. I think I have what so far needed at this point.

Once again many thanks

Steven

Contributor
Posts: 32

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

compare averages and prpoprtions in Proc surveymeans and Proc surveyfreq

  

Dear Steve:

I do need some help with similar data. How to compare averages and proportions in Proc Surveymeans and Proc Surveyfreq.

The data contains the following variables:

x1 = mother age

x2 = father age

x3 = (yes, no) = (1,2)

x4 = (yes, no) = (1,2)

x5 = (yes, no) = (1,2)

x6 = (yes, no) = (1,2)

x7 = stratum

x8 = weight

this is part of the data can be used as an example:

=====================================

x1x2x3x4x5x6x7x8
38.84661111216.61921705
22.92332512216.61921705
35.4849342122214.51497509
18.9863191122220.88637405
27.9425232122216.61921705
23.0904251122220.88637405
26.005534222211.56167161
28.6411381122216.61921705
38.4986421222216.61921705
31.128832222211.56167161
36.9534362222214.51497509
22.1425402222216.61921705
29.7890322222214.51497509
28.6904301122216.61921705
20.0877321122216.61921705
31.619230222211.56167161
23.9836241122216.61921705
18.6110261122220.88637405
26.515128112212.09612124
29.263029211211.56167161
19.6630192221216.61921705
17.4466171212.09612124
35.3342412222214.51497509
29.6466221122216.61921705
21.1890301122216.61921705
25.4055401122216.61921705
19.01641812216.61921705
38.4877322212.09612124
31.0630322222214.51497509
22.561624222211.56167161
26.3178362222214.51497509
21.695920222212.09612124
23.7479232221216.61921705
19.265823112212.09612124

I need help with two things:

(1) compare the means of the variables X1 and X2 (continuous variables) in Proc Surveymeans.

case 1: independent data

case 2: paired (matched) data.

(2) Compare the proportions of ones in the two variables X3 and X4 in Proc Surveyfreq.

(3) Similar to (2) compare the proportions of ones in the two variables X5 and X6 in Proc Surveyfreq. Once I know how to do (2), I will be able to do (3)

thank you very much in advance

steven

email: sstoline@gmail.com

Respected Advisor
Posts: 2,655

Re: Perform ANOVA and multiple comparisons with PROC surveymeans and more

To compare means under model assumptions, you'll need to use PROC SURVEYREG.  If you are interested in the raw means, then Example 92.2 in the SURVEYMEANS documentation should cover what you are looking for under (1).  For (2), I think you will have to create another variable that indicates pair membership, and use SURVEYREG with it as a CLASS variable.

The latter questions depend on what you are trying to do.  If it is just a matter of the proportion of ones in X3 and X4 separately, then Example 90.1 in the SURVEYFREQ documentation is what is needed.  However, if you want the proportion of ones in X3 and X4 combined, you will probably have to restructure your dataset to combine the variables.

Steve Denham

🔒 This topic is solved and locked.

Need further help from the community? Please ask a new question.

Discussion stats
  • 21 replies
  • 1221 views
  • 3 likes
  • 2 in conversation