add1.item.scale | R Documentation |
This allows you to take an item.scale and iteratively add new items. It recalculates the scale and also calculates new Cronbach's alpha for each new scale.
## S3 method for class 'item.scale'
add1(x, scope)
x |
An |
scope |
A character vector containing the list of items that will be added. Items must be present either in the original data from of x or in the environment. |
This is useful during exploratory analysis in determining which items are needed in a scale.
Each item in scope
will be added separately in the order they are given and a
new scale/alpha will be computed.
An n
by 3 matrix where n
is the number of items to be added.
Includes the mean, standard deviation, and alpha of each new scale as items are added.
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