Learning Goal: I’m working on a statistics question and need the explanation and answer to help me learn.
Consider the following results from a five-question attitude scale. Dichotomize the answers and calculate the 1) Minimal Marginal Reproducibility; 2) Coefficient of Reproducibility; 3) % improvement; and 4) Coefficient of Scalability. Is this a Unidimensional Scale? (PDF Example of Guttman Scale attached)
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Q#1 |
Q#2 |
Q#3 |
Q#4 |
Q#5 |
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+A |
+A |
A |
+A |
+A |
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+A |
A+ |
A+ |
+A |
+A |
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+A |
+A |
A |
A |
+A |
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+A |
+A |
= |
+A |
A |
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+A |
A |
D |
A |
A |
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A |
A |
A |
= |
D |
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+A |
A |
A |
D |
D |
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A |
D |
A |
A |
D |
|
+A |
+A |
= |
D |
D |
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+A |
A |
D |
D |
D |
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A |
D |
D |
A |
D |
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+A |
D |
D |
D |
A |
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+A |
A |
D |
D |
+D |
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A |
A |
D |
D |
D |
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A |
D |
A |
D |
D |
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D |
A |
D |
D |
D |
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A |
D |
D |
D |
D |
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D |
A |
D |
D |
D |
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D |
D |
D |
+D |
+D |
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+D |
+D |
+D |
+D |
+D |
