what is the sas model predicting intervals what is sas r what is the sas code for heteroscedasticity r code for predicting intervals sas predict intervals for heteroscedastic data r sas predictor definition what does the prediction interval in r mean what is the sas pc code for heteroscedastic data what is a predicted interval in SAS what is the prediction interval on sas what is a prediction interval sas what is the r code used to predict an observation how to set the predicted interval with r code what is a prediction data model what is sas prediction interval sas how to find intervals in heteroscedastic data what is r code to predict intervals what is the r code for predicting intervals what is the sas prediction interval what is the sas prediction interval