hi, I doing a research which compare basic model with new model. This new model is basic model+ a new biomarker. I have a dichotomous outcome. I want to calculate IDI and NRI to show the added predictive ability of this new marker on the basic model.   I found a paper by Kevin Kennedy A SAS macro to compute added predictive ability of a new marker in logistic regression. I try to used the syntax in the appendix of this paper but the result did not come out. here I post what the log said. it keep saying uninitialized. what did I do wrong? or could you help me where I could download the macro so that I could just used it instead? I already email Mr Kennedy but still not receive any reply. it would be nice if someone could help me.tx   label relative_idi='Relative IDI';format pvalue_idi pval.; _____ 484 NOTE 484-185: Format PVAL was not found or could not be loaded.   141 run;   NOTE: Numeric values have been converted to character values at the places given by: (Line):(Column). 129:23 129:51 NOTE: Variable p_event_new is uninitialized. NOTE: Variable p_event_old is uninitialized. NOTE: Variable p_nonevent_new is uninitialized. NOTE: Variable p_nonevent_old is uninitialized. NOTE: Variable eventstderr is uninitialized. NOTE: Variable noneventstderr is uninitialized. NOTE: Missing values were generated as a result of performing an operation on missing values. Each place is given by: (Number of times) at (Line):(Column). 1 at 122:17 1 at 125:12 1 at 125:29 1 at 125:33 1 at 125:49 1 at 127:11 1 at 127:20 1 at 127:25 1 at 128:10 1 at 128:19 1 at 128:24 1 at 131:7 1 at 131:14 1 at 131:16 1 at 131:33 1 at 131:37 1 at 131:53 1 at 133:16 1 at 133:17 1 at 133:26 1 at 134:25 1 at 136:83 1 at 137:82 1 at 138:22 1 at 139:23 NOTE: The data set WORK.FIN has 1 observations and 20 variables. NOTE: DATA statement used (Total process time): real time 0.08 seconds cpu time 0.04 seconds     142 143 144 145 OPTIONS NONOTES NOSTIMER NOSOURCE NOSYNTAXCHECK; 157 ... View more