Comparison of OpenEpi confidence intervals for a sample mean to other public software programs.

 

 

Mean, Std Deviation, (sample size) while population size (N=999,999,999) and 95% confidence intervals are held constant

 

150, 27.36

(n=268)

10.89, 3.76

(n=20)

1.56, 8.56

(n=100)

1.56, 8.56

(n=30)

 

95% CI based on z-statistics

 

Confidence limits

 

Confidence limits

 

Confidence limits

 

Confidence limits

OpenEpi

 

146.725, 153.275

9.34, 12.54*

-0.1176, 3.2376

-1.503, 4.6229

EpiInfo6@

(DOS version)

 

 

146.72, 153.28

9.34, 12.54*

-0.12, 3.24

-1.5-4.62

 

95% CI based on t-statistics

 

 

 

 

OpenEpi

 

146.709, 153.291

9.1362, 12.6438

-0.1385, 3.2585

-1.6364, 4.7564

PEPI$

 

146.709, 153.291

9.1303, 12.6497

-0.1385, 3.2585

-1.6364, 4.7564

@ t-statistics is not available

$  z-value is not available.

*  Normal approximation method not recommended due to small sample size.

 

PEPI: Abramson JH and Gahlinger PM (2001). Computer program for epidemiologists: PEPI version 4.0. Sagebrush Press, Salt Lake City. Used CONFINT.EXE version 4.0.

EpiInfo6 (DOS version). Epidemiology program office, CDC. (EpiInfo software downloaded from ‘www.cdc.gov’).