RUMM2030 features from version RUMM2020

     Estimation procedures

1

optional null category adjustment in polytomous items.

2

optional unbiased [Warm’s weighted] or maximum likelihood estimates for the person parameters.

3

optional partitioning of items into subsets with different RATE Mode parameters in the different subsets.

4

an expanded ANCHOR routine to include the RATE mode option.

5

option for selecting single and multiple random samples of persons for successive analyses.

     Tools

1

a Wizard for creating and amending and editing Templates.

2

facility to split an original item to create a set of separate items for each level of a Person Factor for DIF.

3

recover original data file containing either the original or the scored responses.

4

recover the Data Format and Item Specification Templates from an existing Project.

5

write out person-by-item residuals for subsequent analyses [e.g. principal components].

New Displays 

1

threshold plots available with the Category Probability Curves.

2

optional plot of observed means on the ICC plots.

3

additional facilities for test equating moving from raw score to latent ability and visa versa.

4

improved Item Map display.

5

cut-and-paste facility using the clipboard for copying data from output tables, or parts of tables, directly to spreadsheets [e.g. EXCEL] or word processing Table objects.

6

tabular displays now in a grid format.

7

information function plots generalised to customised subset of items comprising a test.

Diagnostic Information 

1

additional test-of-fit statistic introduced for individual items.

2

frequency distribution of residuals test-of-fit statistic.

3

simultaneous analysis of general fit and DIF.