Description Usage Arguments Details Value References
To assess the unidimensionality of a set of items from alpha coefficient. License :GPL (>= 2) Extracted from CMC_1.0 package
1 | alpha.c(test)
|
test |
a Dataframe that holds the test response data |
To construct the curve takes the next step by step: 1. The first step uses all items to compute alpha. 2. One item is removed from the scale. The removed item is that which leaves the scale with its maximum alpha value. If we remove a bad item, the alpha coefficient will increase, whereas if we remove a good item alpha must decrease. 3. This procedure is repeated until only two items remain.
The number of items used to calculate the coefficient.
The maximum value of the alpha coefficient calculated at each step.
The item removed at each step.
Tue Cronbach-Mesbah curve plot.
Cameletti, M. & Caviezel, V. (2010). Checking the unidimensionality in R using the Cronbach-Mesbah curve.
Mesbah, M. (2010). Statistical quality of life. In "Method and Applications of Statistics in the Life and Health Sciences", N. BalakrishnanEd., Wiley, pp. 839-864.
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