Based on the result of the proc reg below.
proc reg data = example outest=parameters; model y = A B C D E F; run;
How can I use SAS to calculate Obs*Rsquare, instead of using calculator?
PROC REG assigns a name to each table it creates in the results.
You can retrieve them through the ODS OUTPUT: https://documentation.sas.com/?docsetId=statug&docsetTarget=statug_reg_details52.htm&docsetVersion=1...
-> To retrieve the value of the R square (i.e. the % of variability explained by the model), the table name is FITSTATISTICS. Here is the code to be submitted before the PROC REG:
ods output fitstatistics = _fitstatistics;
What do yo mean by "Obs*Rsquare"?
You probably need
ods output fitstatistics=fitstatistics nobs=nobs;
as the number of observations used in the regression is in the NOBS table.
how can I know which symbols are used for the number of observation and the value of R-Square?
You can know which variables contain the values you want by actually looking at these data sets that are created.
I'm skeptical that Obs*Rsquare has any particular meaning in a regression; why do you want this value?
Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
Find more tutorials on the SAS Users YouTube channel.