Nonparametric Methods in Statistics with SAS Applications

158 RESAMPLING METHODS FOR INTERVAL ESTIMATION

The confidence interval is

CI_95_ CI_95_

lower upper

321.578 359.077



Example 8.2 For the data in Example 3.3, we apply the jackknife method to con-

struct a 99% confidence interval for the Spearman correlation coefficient between

the number of hours students studied for an exam and their scores on that exam. The

statements below produce the desired confidence limits.

data studying4exam;

input hours score @@;

datalines;

0 28 5 94 9 84 7 45 17 82 17 99 5 67

12 97 21 79 3 93 7 62 29 60 7 85 10 78

;

proc corr data=studying4exam outs=corr_all;

var hours score;

run;

data _null_;

set corr_all;

if (_type_=’N’) then

call symput (’n_obs’, hours);

if (_type_=’CORR’ and _name_=’hours’) then

call symput (’corr_all’, score);

run;

data ...