Problem in using mirtCAT() function

[Irshad Mujawar]

Hello Phil,

I am trying to use mirtCAT() by setting df = NULL, as I want to use it as offline without shiny questions. ( I am using dev version of mirtCAT i.e. 0.4.7 and and 1.9 of mirt package).

mod <- mirt(Science, 1)

CATdesign <- mirtCAT(df=NULL, mod, criteria = 'MI', design_elements = TRUE, local_pattern = c(1,1,1,1))

 
findNextItem(CATdesign)
[1] 1
Warning message:
In is.na(person$responses) :
  is.na() applied to non-(list or vector) of type 'NULL'


 CATdesign <- updateDesign(CATdesign, items = 1, responses = 1, Theta = 0.5)
Error in x$person$items_answered[pick:(length(responses) + pick - 1L)] <- as.integer(items) :
  negative length vectors are not allowed
In addition: Warning messages:
1: In is.na(x$person$items_answered) :
  is.na() applied to non-(list or vector) of type 'NULL'
2: In min(which(is.na(x$person$items_answered))) :
  no non-missing arguments to min; returning Inf

I am getting above error. Can you please help me out with this? Where am I going wrong?

Thanking you in advance,

Irshad.

[Phil Chalmers]

Hi Irshad,

Good catch, this was a bug introduced after rearranging some code for more portable user interfaces. It's been patched.

Phil

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[Irshad Mujawar]

Thank you very much Phil. It is working fine now.