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libaiyi
Junior

China,
2018-06-28 11:47

Posting: # 18988
Views: 722
 

 How to calculate the sample size when we have 3 treatments? [Software]

Dear all,

I want to know how to calculate the sample size when there exists R, T1, T2 under 3*3 or 6*3 design?
Is there any software or R package available for statistical analysis of william design or 3*3 design when there exists R, T1, T2?

Thanks in advance.:-D
Helmut
Hero
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Homepage
Vienna, Austria,
2018-06-28 12:57

@ libaiyi
Posting: # 18989
Views: 634
 

 Sample size estimation: PowerTOST

Hi libaiyi,

» Is there any R package available for statistical analysis of william design or 3*3 design when there exists R, T1, T2?

The function sampleN.TOST() of package PowerTOST. After installing/attaching in the R-console or the command window of R Studio type known.designs() to see what is covered. In sampleN.TOST() use the argument design (i.e., design="3x6x3" for the six-sequence Williams’ design or design="3x3" for the Latin Square).
For low to moderate CVs sample sizes will be identical.

Cheers,
Helmut Schütz
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d_labes
Hero

Berlin, Germany,
2018-06-28 13:30

@ libaiyi
Posting: # 18990
Views: 622
 

 Sample size for 3 treatments

Dear libaiyi,

additional to what Helmut has recommended:
Calling sampleN.TOST() with argument design="3x6x3" is appropriate if you aim for analyzing the data according to the "all at once" strategy.

If you analyze according to the "two at a time" strategy use design="2x2", the default for that argument.

Regards,

Detlew
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