xmpl | R Documentation |
Data to illustrate the usage of patt.design for rating scale (Likert type) items
.
xmpl
A data frame with 100 observations on 5 numeric variables.
The first three variables (I1
, I2
, I3
) are the rating scale (Likert type) items with 5 response categories, ranging from 1 (strong agreement) to 5 (strong disagreement).
I1
response to item 1
I2
response to item 2
I3
response to item 3
SEX
(1) male, (2) female
EDU
(1) low education, (2) high education
Datasets in data files or Data frames used in patt.design
require the following structure:
All values must be numeric.
The item responses must be in the leftmost columns (such as I1
to I3
above).
Categorical subject covariates follow the item responses (rightmost columns) and their levels must be specified as consecutive integers.
If in a used datafile or dataframe these are defined as R factors they will be converted to integers.
This is not possible if characters are used as factor levels and, consequently, patt.design
will produce an error.
des <- patt.design(xmpl, nitems = 3, resptype = "rating", cov.sel = "SEX")
head(des)
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