﻿ TCCFILE= Test Characteristic Curve and Test Information Function

# TCCFILE= Test Characteristic Curve (TCC) and Test Information Function (TIF)

TCCFILE= specifies the file  to hold the coordinates for the Test Characteristic Curve and the Test Information Function. See Test Characteristic Curve  and the Test Information Function in the Graph Window, also Table 20.

 ; TCC + TIF CURVES FOR LIKING FOR SCIENCE MEASURE  SCORE   INFO    SEM   -8.00    .05    .05   4.31   -7.98    .06    .05   4.27   -7.97    .06    .06   4.24   -7.95    .06    .06   4.20   -7.94    .06    .06   4.17   -7.92    .06    .06   4.14   -7.90    .06    .06   4.11 The contents of the TCCFILE= MEASURE The person ability measure (theta in logits or user-scaled USCALE= units) SCORE Test Characteristic Curve, TCC: the expected score on the test for the MEASURE INFO Test Information Function, TIF: the statistical information in the score SEM Standard Error of Measurement for the MEASURE when estimated from the SCORE = 1 / √ INFO

Example: www.rasch.org/memo1.htm  Figure 2 shows the TCC for two person groups on the same plot. How can I do this?

These needs two analyses, but only one control file and data file. Put the group code in column 1 of the person label. Then, here is the procedure with Example0.txt - since item 19 is extreme for one group, it is omitted with IDELETE=19 from both groups

analysis 1: at the Extra Specification prompt, type the person group code for the first group:

PSELECT=F

do the analysis, then

Ouput TCCFILE= to Excel temporary file

analysis 2: at the Extra Specification prompt, type the person group code for the second group:

PSELECT=M

do the analysis, then

Ouput TCCFILE= to Excel

Excel plot:

copy the first two columns of both Excel files into one worksheet.

scatterplot the MEASURE columns against the matching SCORE columns

Here is what I see:

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