Question

1. The following problem uses the SAS sashelp.baseball data set. Create a SAS code to...

(a) Calculate and report the mean number of Home Runs (nHome) for all the observations in the

entire data set. Call this number the "population mean" Home Runs.

(b) Write a program that will automatically select the first 50 odd-numbered observations in the data set

(i.e., the 1st, 3rd, 5th, ..., 99th observations). Calculate and report the sample mean Home Runs (nHome)

for this selected systematic sample.

Answer 1

data baseball;
   set sashelp.baseball;
run;

/*Par a > Mean of home runs */

proc means data = baseball;
   var nhome;
   output out = hmean
       mean = hmean;
run;

/*Part b> taking sample - first 50 odd number obs*/

data sample;
   set baseball;
   if _n_ = 1 then ord = 1;
   else ord+1;
   if mod(_n_,2) = 1 then output;
   if ord >=100 then stop;
run;

proc means data = sample;
   var nhome;
   output out = shmean
       mean = shmean;
run;

The MEANS Procedure Analysis Variable :ntome Home Runs in 1986 Mean Std Dev Minimum Maximum 322 11.1024845 8.6987696 0 40.0000000 L This is population mean The SAS System The MEANS Procedure Analysis Variable :ntome Home Runs in 1986 Mean Std Dev Minimum Maximum 50 12.5600000 9.5365248 0 35.0000000 This is sample mean