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Messages - dan_c

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1
Questions and Answers / Re: Asking about facet model with SPSS datafile
« on: September 06, 2019, 12:03:52 AM »
Hi Lan Anh,

You can specify a facet mode using an SPSS like this (based on your cqc file attached):

Code: [Select]
datafile  Obs.sav !
    filetype=spss, responses=A1 to C6, keeps = ObsID;

...


model item+step+item*step+ObsID;

This will give you a partial credit with a main effect for rater (ObsID) harshness. You will need to carefully think about model identification if you want to fit more complex models, like then in your attached cqc file - I don't think you will have an observation of every rater using every response category for every item in order to include the item*step*ObsID interaction.

2
The next iteration of Understanding Rasch Measurement Theory starts on Monday 15 July 2019.  This is a 100% online, 10 week, part-time, masters level course.
 
Led by world-renowned researcher and psychometrician Professor Geoff Masters, this masters level course will unlock the practical understanding you need to get the most from Rasch.
 
Find out more about enrolments, course outline and contents, and what to expect from an ACER online course below.
 
https://www.acer.org/au/professional-learning/postgraduate/rasch

3
check out:

Adams, R. J., Wilson, M., & Wang, W. (1997). The Multidimensional Random Coefficients Multinomial Logit Model. Applied Psychological Measurement, 21(1), 1–23. https://doi.org/10.1177/0146621697211001

4
This is a known bug in ConQuest:Version: 4.15.0.

There are two workaround:

1. remove pid form your format statement:
Code: [Select]
format responses 8-169 (a2);
2. Contact ACER sales to be issued a beta build of ACER ConQuest - see details in your earlier post https://conquest-forums.acer.edu.au/index.php?topic=1287.msg1640#msg1640

See attached your run from the beta build

5
All the notes and tutorials can be downloaded from:

https://www.acer.org/au/conquest/notes-tutorials

I will follow up with the broken link on the shop page.

6
Questions and Answers / Small font size in ConQuest GUI on Windows 10
« on: April 23, 2019, 01:53:53 AM »
Some users have reported the font size in ConQuest GUI on Windows 10 is very small.

see example attached.

The workaround is to disable high DPI scaling behaviour.

1. Open ConQuest GUI
2. Right click the icon in the taskbar and click "properties"
3. Go to the Compatibility tab, enable “Override High DPI scaling behavior” and set the Scaling Behaviour to “System.”
4. click okay

See attached image.

7
by ".prn" files, do you mean exported item parameters, created using the "export" command?

https://conquestcommandref.netlify.com/commands.html#export

If so, yes, you can read in item parameters and use them as starting values or anchors using the "import" command. See:

https://conquestcommandref.netlify.com/commands.html#import

Remember that the item parameters exported are only those that are estimated. If you use the item constraint to identify your model, you're exported parameters will exclude the last item (which is the negative sum of the other items).

Another approach is to save the current state of conquest in a system file using the command "put". If you estimate a model, then write a system file, you can later read that system file back in and you won't need to re-estimate the model/calculate fit/gereate case estimates etc.

https://conquestcommandref.netlify.com/commands.html#put
https://conquestcommandref.netlify.com/commands.html#get

If you write a system file and also use R, you can read it into R using the conquestr library:

https://cran.r-project.org/package=conquestr

8
Questions and Answers / Re: Analysis contentwise result
« on: April 18, 2019, 01:34:35 AM »
One option would be to fit a multidimensional model.

See the Command Reference, the command is "score"

Quote
To fit multidimensional models, multiple score lists are provided. Here, the score statement has three score lists after the codes list, so the model that is fitted will be three-dimensional. Items 1 through 8 and item 12 are on dimension one; items 9, 13 through 16 and 18 are on dimension two; and items 10, 11 and 17 are on dimension three. Because each item is assigned to one dimension only (as indicated by the zeros in all but one of the score lists for each score statement), we call the model that will be fitted when the above score statements are used is a between-item multidimensional model.

Code: [Select]
score (1 2 3) (0 1 2) (0 0 0) (0 0 0) ! items (1-8,12);
score (1 2 3) (0 0 0) (0 1 2) (0 0 0) ! items (9,13-16,18);
score (1 2 3) (0 0 0) (0 0 0) (0 1 2) ! items (10,11,17);

https://conquestcommandref.netlify.com/commands.html#score

You will have to provide some more information - how many items in each sub-domain etc?

Uploading you data and syntax may also help.

9
Questions and Answers / Re: kidmap command in Mac version
« on: April 09, 2019, 08:21:29 AM »
There is a bug in ConQuest Mac that prevents it drawing kidmaps.

Users can contact sales@acer.org with their current key if they need support to fix this.

The bug will be fixed in the next public release > 4.15

11
General Discussion / MOVED: Error Message
« on: April 07, 2019, 11:13:05 PM »

12
Questions and Answers / Re: softkey
« on: April 07, 2019, 06:18:09 AM »
You only need to set your licence key once. You can only use a key once - if you set the key, then try to re-use it, ConQuest will report an error.

I think you are using the mac version, right? Are you running conquest from the dmg installer? If you are, check out the installation instructions - you should drag the ConQuest folder to your Applications folder.

13
Questions and Answers / Re: kidmap command in Mac version
« on: April 07, 2019, 06:15:46 AM »
yes, kidmap is available for the mac version.

what happens when you try and run kidmap with one of the examples in the notes and tutorials? e.g.,

https://www.acer.org/files/Conquest-Tutorial-1-RASCHModelMultipleChoiceTest.pdf

14
Questions and Answers / Re: Error Message
« on: April 07, 2019, 06:13:10 AM »
You'll need t provide a bit more information for us to help.

If you require specific advice about a model, please upload your data and syntax, or alternatively provide a minimum working example:

https://conquest-forums.acer.edu.au/index.php?topic=1239.0


15
Questions and Answers / Re: item parameter
« on: March 31, 2019, 02:33:38 AM »
if you require specific advice about a model, please upload your data and syntax, or alternatively provide a minimum working example:

https://conquest-forums.acer.edu.au/index.php?topic=1239.0

For a model to be identified, every response category for each item needs to have at least one valid response. Creating a frequency table for each item will show you how many responses are within each response category.

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