likert | R Documentation |
This function will provide various statistics about a set of likert items. The resulting object will have the following items:
likert(items, summary, grouping = NULL, factors = NULL, importance, nlevels)
items |
data frame containing the likert based items. The variables in the data frame should be factors. |
summary |
a pre-summarized data frame. The first column must be the items and the remaining columns are the levels (e.g. strongly disagree, disagree, etc). |
grouping |
(optional) should the results be summarized by the given grouping variable. |
factors |
a vector with |
importance |
a data frame of the same dimensions as items containing an importance rating for each item. The order of columns should match and the names from items will be used. |
nlevels |
number of possible levels. Only necessary if there are missing levels. |
results
- this data frame will contain a column 'Item', 'Group' (if a
grouping variable was specified, and a column for each level of the
items (e.g. agree, disagree, etc.). The value within each cell corresponds
to the percentage of responses for that level and group.
items
- a copy of the original items data frame.
grouping
- a copy of the original grouping vector.
nlevels
- the number of levels used in the calculations.
a likert class with the following elements: results, items, grouping, nlevels, and summary.
plot.likert
summary.likert
data(pisaitems) items29 <- pisaitems[,substr(names(pisaitems), 1,5) == 'ST25Q'] names(items29) <- c("Magazines", "Comic books", "Fiction", "Non-fiction books", "Newspapers") l29 <- likert(items29) summary(l29) plot(l29)
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