Bioequivalence and Bioavailability Forum • Tracking down error: stringsAsFactors

Tracking down error: stringsAsFactors [Power / Sample Size]

posted by d_labes – Berlin, Germany, 2020-05-13 13:34 (1438 d 02:56 ago) – Posting: # 21431
Views: 6,885

Dear Helmut, dear Alyssa!

❝ ❝ Then i continued with the following command but it appeared error: […]

❝ Let’s try to figure it out. Execute this code:

❝ ...

❝ res <- data.frame(design = rep(designs, each = length(target)),

❝ target = target, n = NA, power = NA)

This line is the casus knacktus!
The error
Error in match.arg(design) : 'arg' must be NULL or a character vector
means that the design argument in the call of sampleN.scABEL() is not character.
Reason:
Before R4.0.0 the optional argument stringsAsFactors in the call of data.frame() was TRUE. Changed in R4.0.0 to FALSE.
Check this in your installation via
default.stringsAsFactors()
If you get TRUE as answer change

res     <- data.frame(design = rep(designs, each = length(target)),

                      target = target, n = NA, power = NA,

                      stringsAsFactors = FALSE)

and than I'm sure that it works.

All the best

—
Regards,

Detlew

Complete thread:

Sample size calculation (Pilot study result vs literature) Alyssa 2020-05-04 04:35 [Power / Sample Size]
- Sample size calculation (Pilot study result vs literature) Dr_Dan 2020-05-04 08:46
  - Sample size calculation (Pilot study result vs literature) Alyssa 2020-05-04 09:26
- Estimation of CVw and/or CVwR Helmut 2020-05-04 12:07
  - Estimation of CVw and/or CVwR ElMaestro 2020-05-04 12:14
    - Mea culpa! Helmut 2020-05-04 12:40
      - It must be Myco ElMaestro 2020-05-04 13:46
        
        It is, it is! Helmut 2020-05-04 14:07
        
        It is.... Alyssa 2020-05-05 05:00
        
        Tutorial Helmut 2020-05-05 12:45
        
        Tutorial Alyssa 2020-05-08 06:48
        
        library d_labes 2020-05-08 11:16
        Tutorial (from the start) Helmut 2020-05-08 13:08
        
        Tutorial (from the start) Alyssa 2020-05-12 04:05
        
        Tracking down error Helmut 2020-05-12 11:49
        
        Tracking down error: stringsAsFactorsd_labes 2020-05-13 11:34
        
        R <4.0.0 Helmut 2020-05-13 12:07
        
        R <4.0.0 ElMaestro 2020-05-13 14:18
        
        R <4.0.0? Helmut 2020-05-13 14:21
        
        PowerTOST’s functions with as.character(design) d_labes 2020-05-13 18:50
        
        PowerTOST’s functions with as.character(design) Helmut 2020-05-13 18:55
        
        Tracking down error Alyssa 2020-05-15 05:08
        
        All’s well that ends well. Helmut 2020-05-15 10:52