what is use of "tolerance" in SAS

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what is the use of tolerance in the below code. I tried googling it but of no use..

    proc print data=clinic.stress double;
var resthr maxhr rechr;
where tolerance='I';
run;

I hope it has to do something with output . But what exactly ?

asked 37 secs ago

Mukesh Kumar Singh

113

what is use of "tolerance" in SAS