Bond & Fox (2001) Applying the Rasch Model ...

Chapter 5: The PRTIII Test

You will need to read the text of the book to understand these examples. Official authors' website: Bond & Fox
Winsteps numerical results may differ somewhat from those in Bond & Fox due to differences in estimation procedures.

B&F PRTIII data p. 53

The entire dataset is obtained from www.jcu.edu.au/~edtgb.

Piagetian Reasoning Test - III data.

The original data set contains 13 items, and the same 150 children who took the BLOT test. Ministep will process the first 75 children.

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Title = "B&F PRTIII data: 13  items"
Item1 = 5        ; Response to first item is in column 5
NI    = 13       ; All 13 items used.
Name1 = 1        ; Person identifier starts in column 1
Namelength = 3   ; Person identifier is 3 columns wide
Xwide = 1        ; Each observation is 1 columns wide
Codes = 10       ; valid codes are "1" and "0"
Total = Yes      ; show total raw scores
Chart = Yes      ; produce across-pathway picture
Mnsq  = No       ; use Standardized fit statistics
Uimean= 0        ; Item mean difficulty at 0.
Stbias= Yes      ; Adjust for estimation bias
&End
1                ; Item labels are original PRTIII item numbers
2                ; Please use item text, where possible!
3
4
5
6
7
8
9
10
11
12
13
END NAMES
001 1001101111110
002 1111111101111
003 1011101110011
004 1011101111110
005 1110010111111
006 1001001100000
007 1001101100010
008 1011111111110
009 1011111101010
010 1111111111111
011 1001111101010
012 1010001100000
013 1011101110010
014 1000000101110
015 1010001100000
016 1011111111010
017 1001101111110
018 1000000101010
019 1001101111111
020 1000000101110
021 1001101111110
022 1110010101000
023 1000111111111
024 1000010000000
025 1110011101111
026 1001111110000
027 1001101111100
028 1001111111111
029 1011111000010
030 1001101000000
031 1010011111110
032 1010011111110
033 0011101100000
034 1001111101111
035 1001111101110
036 1010011111110
037 1000000100000
038 1001101110000
039 1000000100000
040 1011111100000
041 1010000101010
042 1010010100000
043 1001101100000
044 1010100101010
045 1000001101010
046 1001101101010
047 1001000111100
048 1110011110010
049 1001101111110
050 1010000101010
051 1011111111000
052 0000000110000
054 1001101111110
055 1111111001111
056 1001110111110
057 1011101111100
058 1001101101110
059 1001101111110
060 1011101101000
061 1000010100000
062 1001001111111
063 0000101000000
064 1011111101010
065 1001101111010
066 1011101100010
067 0000000000000
068 1000000100000
070 1000001100000
072 1001111101110
073 1000000101010
074 1011101111010
075 1000000100000
076 1011101111111
077 1001000100010
078 1011001111000
079 1000000001100
080 1001110100010
081 1011101111000
082 1011101110000
083 1001111101110
084 1011101111110
086 1001111001100
087 1000001100000
088 1000000111110
090 1001100111000
091 1010101101110
092 0001101101010
093 1001001100000
094 1001011101010
095 1000001101010
096 1001111100000
097 1000001001110
098 0000000110000
099 0000000000000
100 1001100001000
101 1011101111110
102 1001100101110
103 1010000100000
104 0001111110000
105 1001000100000
106 1001101110000
107 0000100001110
108 0011000100000
109 0000000101110
110 1001001111110
111 1000000100000
112 1000000101010
113 1000100100000
114 0000001101010
115 1001101100000
116 1000000001000
117 1000101110000
118 1000000100000
119 1000000100000
120 1000110100000
121 1000000001010
122 0000000000000
123 1000100001000
124 1001011000000
125 1000000100000
126 1000000000000
127 1001000111100
128 1001000100010
129 1000000100000
130 0000000100010
132 1001101101100
133 1000000001010
131 1000000000000
134 0001100110000
135 1001000100000
136 0001001100000
137 1000000100000
138 1000000000000
139 0000000000000
140 1000000101001
141 1000000001010
143 1000000000000
144 1000000000000
145 1000000101000
146 0000000000000
147 0000000101000
149 1000010110000
150 1000011101000
151 1000000110000
152 1000000100000
153 0011101100000
154 0000000100000
155 1001111101010
156 0000000000000
158 1011100101010

Start Ministep.
Do not answer the "Control File Name?" question.
Go immediately to "Edit" pull-down menu.
Click on "Edit/Create File with WordPad"
WordPad screen opens.
"Paste Special" as "Unformatted Text" what you just copied above.

It should look exactly like the block above.

"Save as"
Go to the C:\WINSTEPS directory
File Name: bond5.txt
Save as type: Text document
"Save"
"You are about to save the document in a Text-Only format ..."
Click "Yes"

Click on Ministep or Winsteps on the bottom of your screen
"Control File Name?" displays.
Press the Enter key
Find bond5.txt in the file list.
Click on it.
Click "Open"

"Report output file name ..."
Press the Enter key

"Extra specifications ..."
Press the Enter key

Ministep runs.
Ministep reports "Measures constructed"

B&F Figure 5.1 paralled p. 55

Click on the "Output Tables" pull-down menu
Click on "13. ITEM Measure". The Table displays.
Scroll down to Table 13.2. This approximates Fig. 5.1
The items are in measure order along the pathway, see the left-hand column.
They spread across the pathway in the Infit Standardized central column.

B&F Table 5.1 p. 56

Click on the "Output Tables" pull-down menu
Click on "14. ITEM Measure". The Table displays.
Table 14.1 matches B&F Table 5.1.
The mean difficulty of the items is ".00".

B&F Figure 5.2 p. 56

To cross-plot the person measures:
Write a PFILE= from the BLOT data.
In a PRTIII analysis, use the "Plots" pull-down menu, then "Compare statistics". Compare measures, and specify the BLOT PFILE=

B&F Table 5.2 p. 56

Click on the "Output Tables" pull-down menu
Click on "18. PERSON entry". The Table displays.
Table 18.1 matches B&F Table 5.2.

For the BLOT results,
Click on "Files" pull-down menu
Click on "Start another MINSTEP"
Press Enter and select BLOT.txt
Run MINISTEP and produce Table 18.
Adjust the two Table 18 windows on your screen to obtain the complete B&F Table 5.2.

Note: The Winsteps instructions on p. 61 are conceptual.

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