jamovi

Hello,

From a database where not all students have answered all the questions, I want to conduct a Polytomous Rasch Model. The software indicate:
Debug

Error in seq.default(min(c(theta, b)) - binwidth/2, max(c(theta, b)) + : 'from' must be a finite number

eval(ev)
eval(ev)
private$.wrightmapPlot(image, theme = t$theme, ggtheme = t$ggtheme, ...)
ShinyItemAnalysis::ggWrightMap(pmeasure, imeasure, color = "deepskyblue")
seq(min(c(theta, b)) - binwidth/2, max(c(theta, b)) + binwidth/2, binwidth/2)
seq.default(min(c(theta, b)) - binwidth/2, max(c(theta, b)) + binwidth/2, binwidth/2)
stop("'from' must be a finite number")


When I assign a random value to the missing data, it's ok.
Can you help me ?

Thomas

Hi thomas.herremans

Have you updated the newest version of snowIRT module? First, you will try it by using example file(Data Library> Item Response Theory folder). Example data is working with some missing values in my case.
Second, if not, could you attach a file that happens error message?
Best
Seol

Hi Seol,

Thank you for your reply. I installed the update and the program gives me another type of error. Most items are dichotomous, but there are also polytomous items. Do you have an explanation for me ?

I place a copy screenshot and a copy of the database.

Thomas

Hi Thomas.

If you have dichotomous items, you should analyze them with dichotomous model. you are using polytomous Rasch model with dichotomous items, which results in errors. or you can try it within Rasch analysis with snowRMM module.

Best Regards
Seol

Hello Seol,

Thank you for your reply. If I have to analyze dichotomous and polytomous items separately, I cannot put them on the same Rasch continuum. Is the "snowRMM module" a solution to my problem.

Best Regards

Thomas

Hi Thomas

I think your dataset doesn't seem to suitable for IRT, which results in error message. you can also try snowRMM module. but I am sure your dataset is running or not.

Best
Seol

Hi Seol,

Thank you for your message. I tried a "snowRMM module" analysis, it doesn't seem to work. Where can I find documentation on the subject? The ConQuest software is perhaps more appropriate in my ca.

Thomas