Scripts - JackknifeSE

JackknifeSE command

JackknifeSE(procedure,tablename).

This procedure creates a table containing the jackknife estimates of bias and standard error.

The following statistical procedures are enabled for the JackknifeSE command (more will follow in coming MedCalc updates):

• MEANS
• CORRELATION, RANKCORRELATION, PARTIALCORRELATION, REGRESSION
• ONESAMPLETTEST, TTESTPAIRED
• SIGNEDRANKSUMTEST, WILCOXON
• RELATIVERISK, MCNEMAR
• BLANDALTMAN, PASSINGBABLOK, DEMING
• CVFROMDUPLICATES
• CONCORDANCE, KAPPA

Notes

• During execution, subgroups are ignored.
• During execution, bootstrap procedures in the statistical procedure itself are disabled.
• When logarithmic transformation (or Box-Cox transformation) is applied, the reported results are not back-transformed to their original scale.

Example

The following example calculates the Jackknife Standard Error for a correlation.

The example is based on a SAS help page.

// Jackknife Standard Error estimation
// example based on
// https://blogs.sas.com/content/iml/2017/06/21/jackknife-estimate-standard-error-sas.html
<data>
lsat gpa
653 3.12   
576 3.39   
635 3.30   
661 3.43   
605 3.13
578 3.03   
572 2.88   
545 2.76   
651 3.36   
555 3.00
580 3.07   
594 2.96   
666 3.44   
558 2.81   
575 2.74
</data>
$variablex="lsat";
$variabley="gpa";
JackknifeSE(correlation,res);
?res;

The results table is:

Statistic
Estimate
Mean Jackknife
estimate
Bias
Jackknife SE
Sample size
15

Correlation coefficient r
0.776374491
0.77591209
-0.006473623
0.14251861

See also

• Scripts
• Bootstrap
• Jackknife
• BootstrapCI and BootstrapBCaCI
• How to invoke a statistical procedures or graph
• System variables

External links

• Jackknife resampling on Wikipedia.