topic Re: Formatting the scree plot x-axis in proc factor in SAS Programming

Formatting the scree plot x-axis in proc factor

CBF — Thu, 04 Apr 2024 19:14:56 GMT

I want to produce a scree plot that I can easily paste into a word document that has an x-axis with only 15 factors. I have tried multiple methods to do this. When I tried ODS RTF, the files were blank. I finally settled on using ODS HTML, but I have not been able to adjust the x-axis on my plot. I tried using a template, but I don't think it is being applied in PROC FACTOR. I tried using SGRENDER, but the images were blank. When I do produce an image, with the code below, the x-axis shows 60 factors, so it is difficult to see where the elbow is. Any help would be greatly appreciated!

PROC TEMPLATE;

DEFINE STATGRAPH SCREEPLOT;

NOTES "SCREE PLOT FOR EXTRACTED EIGENVALUES";

BEGINGRAPH / DESIGNWIDTH=DEFAULTDESIGNHEIGHT;

ENTRYTITLE "EIGENVALUE ((*ESC*){UNICODE LAMBDA}) PLOT";

LAYOUT OVERLAY / YAXISOPTS=(LABEL="(*ESC*){UNICODE LAMBDA}")

XAXISOPTS=(LABEL="FACTOR NUMBER"

LINEAROPTS=(TICKVALUELIST=(1 2 3 4 5 6 7 8 9 10)));

SERIESPLOT Y=EIGENVALUE X=NUMBER / DISPLAY=ALL;

ENDLAYOUT; ENDGRAPH; END; RUN;

ODS GRAPHICS ON ;

%LET OUTDIR=[PATH] ;

ODS HTML PATH="&OUTDIR" (URL=NONE)

BODY='BODY2.HTML'

/*CONTENTS='CONTENTS2.HTML'

FRAME='FRAME2.HTML' */ ;

PROC FACTOR DATA = DATA METHOD=PRINCIPAL PRIORS=SMC RESIDUAL

ROTATE=VARIMAX OUTSTAT=OUTSTAT

PLOTS(UNPACK)=SCREE REORDER ;

VAR &VARS ;

RUN;

ODS HTML CLOSE ;

Re: Formatting the scree plot x-axis in proc factor

ballardw — Thu, 04 Apr 2024 22:11:36 GMT

Did you look at the Proc Factor option NPLOTS= to limit the number of factors plotted?

Re: Formatting the scree plot x-axis in proc factor

Ksharp — Fri, 05 Apr 2024 02:41:20 GMT

You could save these data firstly ,afterwards polt it by PROC SGPLOT.

ods select none;
ods output ScreePlot=ScreePlot;
PROC FACTOR DATA = sashelp.heart METHOD=PRINCIPAL PRIORS=SMC RESIDUAL  
ROTATE=VARIMAX OUTSTAT=OUTSTAT 
PLOTS(UNPACK)=SCREE REORDER  ;
  VAR _numeric_ ; 
RUN; 
ods select all;


%let n=6;  /*the number of factors you want to display*/
proc sgplot data=ScreePlot(where=(number<=&n.));
series x=number y=Eigenvalue/markers;
run;

Or you could check the next graph "the explained variance" to find elbow point ?

Re: Formatting the scree plot x-axis in proc factor

CBF — Fri, 05 Apr 2024 15:00:57 GMT

This worked! Thank you!