[Rasch] Rasch analysis of mixed format data using jMetrik

Charalambos Kollias chkollias at outlook.com
Wed Dec 15 03:02:29 AEDT 2021

Hi Yingchen,

As it is hard to ascertain where the issue is in jmetrik - let's take it step by step.

Let's begin by checking whether key has been inserted correctly.

"Transform" - "Advanced Item Scoring" -
Click on item 1
Click arrow ">" (item 1 should be in box on right side)
Set scoring as follows: (left had box)
Options          Score
4                            4
5                           5
6                            6
7                           7
8                           8
.                            .
.                            .
.                           .
19                      19

Press Submit

In "scoring syntax" text box you should have:
Options = (4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19), scores = (4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19), variables = (item1)

Press "OK"

Go to "variables" tab

"Refresh Data View"

Does item 1 in type column say "polytomous item"?

Has key been entered correctly?



From: Rasch <rasch-bounces at acer.edu.au> on behalf of Yingchen <2596011329 at qq.com>
Sent: Tuesday, December 14, 2021 2:52 PM
To: Yingchen  <2596011329 at qq.com>; rasch <rasch at acer.edu.au>
Subject: [Rasch] Rasch analysis of mixed format data using jMetrik

Hi, dear Rasch users:
   I used jMetrik to analyze the mixed data, a combination of binary items and polytomous item. The polytomous item is scored by human raters, ranging from 4 to 19. I tried to input the practical range (4-19) as well as the theoretical range (0-20). None of the efforts succeeded. Each time, the polytomous item was dropped from the analysis.

  Item formats are correct. Between 4 and 19, "5" is missing.

  I checked at jMetrik online instruction, but didn't find any solution. Google is not available in China.

  Would appreciate if anyone can help.

发件人:"Yingchen "<2596011329 at qq.com>
发送时间:2021年10月26日(星期二) 晚上10:53
收件人:"rasch"<rasch at acer.edu.au>;
主题:Questions about partial credit model
Hi, friends:
 Some simple questions.
 (1). What is the maximum number of categories that partial credit model can handle? I recall that some professor said 12. Not 100% positive.
 (2) What is the maximum number of categories that our current Rasch programs (Winsteps, jMetrik, conquest, etc) can handle?
 (3) If my memory is correct (12 as maximum number of categories) and that is the limit of our current programs, are there any ways to bypass this limit? Certainly, the purpose is to run a program on polytomous data with more categories.

 Thank you for your help.

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