OpenEpi, Version of December, 2003

Test Results for SSCohort Module

 

 

Dataset #

Confidence, Power (%)

Ratio, Outcome in Unexp, in Exp

Compared with

Result

S-1

95,90

1, 0.03%, 0.015%

Snedecor & Cochran, Statistical Methods, Iowa State University, 1980, p. 130. Salk Trial Example,

Agreement (210171 vs. 210000, assuming that Snedecor and Cochran rounded off)

S-2

95,90

2, 30%, RR>=4

Schlesselman, JJ, Case-Control Studies, Oxford Univ. Press, 1982

Agreement

S-9

95,80

1, 5%,10%

Pezzullo JavaStat website. Proportion Difference Power/Sample Size Calculation

http://members.aol.com/johnp71/proppowr.html

Agreement, with OpenEpi rounding up

S-8

99,80

1, 40%,60%

Pezzullo JavaStat website. Proportion Difference Power/Sample Size Calculation

http://members.aol.com/johnp71/proppowr.html

Agreement, with OpenEpi rounding up

S-7a

95,80

0.25, 5%,10%

Pezzullo JavaStat website. Proportion Difference Power/Sample Size Calculation

http://members.aol.com/johnp71/proppowr.html

1256 vs 1253

314 vs 313

S-7b

95,80

0.25, 5%,10%

Epi Info Statcalc

1256 vs 1253

314 vs 313

 

 

 

 

 

 

Testing by Andy Dean.  .

 

Conclusions: OpenEpi sample size programs round results UP rather than to the nearest integer, since it is difficult to find 0.1 person to participate in a study.  Agreement takes this into account. 

 

These results are sufficient to remove the BETA labels from the programs, although further testing and comparison of important results with those from other programs is always in order.  Please send us results of further testing so that we can add them to this list.