Estimating the Growth Rate and Doubling Time for Short-Term Prediction and Monitoring Trend During the COVID-19 Pandemic with a SAS Macro

Stanley Xu; Christina Clarke; Susan Shetterly; Komal Narwaney

put "Looping through the starting date and the last date -&int_length +1 days:"; put start = endloop =; run; %do start_day = &fup_start %to (&fup_end-&int_length+1); /*Hold onto the current start day to append to some of the final datasets so they do not get overwritten*/ %let stdyfmt = %sysfunc(putn(&start_day,date9.)); /*Using the input dataset, calculate the last day that will be considered in these calculations for each interval. /*This model will estimate r, the growth rate. Create one dataset for each iteration of the start day.*/ proc nlin data=CGR_dat02 list noitprint; parms r 0.75; model &numevents = start_new_event*((1+r)**(&dateofevent -&start_day)); output out = preddeath_start_&stdyfmt . CC-BY-NC-ND 4.0 International license It is made available under a author/funder, who has granted medRxiv a license to display the preprint in perpetuity.