is.likert(x)
as.likert(x, ...)
"as.likert"(x, ...)
"as.likert"(x, ...)
"as.likert"(x, ...) ## doesn't work yet
"as.likert"(x, ...)
"as.likert"(x, ...)
"as.likert"(x, ReferenceZero=NULL, ..., rowlabel=NULL, collabel=NULL, xlimEqualLeftRight=FALSE, xTickLabelsPositive=TRUE, padding=FALSE, reverse.left=TRUE)
"as.likert"(x, ...)
"as.likert"(x, ...)
"rev"(x)
is.likertCapable(x, ...)
as.likert
methods, a numeric object stored as a vector, matrix,
two-dimensional table, two-dimensional ftable,
two-dimensional structable (as defined in the vcd
package),
or list of named matrices.
For functions is.likert
and is.likertCapable
, any object.
This is the only required argument.names(dimnames(x))
, where x
is
the argument to the as.likert
functions.
These will become the xlab
and ylab
of the likert plot.as.likert
method.likert
.FALSE
. If
TRUE
, then the left and right x limits are set to negative
and positive of the larger of the absolute value of the original x limits.TRUE
.
If TRUE
, then the tick labels on the negative side are
displayed as positive values.padding
is FALSE
for
likert
and TRUE
for likertMosaic
.
reverse.left
is TRUE
for likert
and FALSE
for likertMosaic
. likert
is based on
barchart
and requires that the sequencing of negative values be reversed. likertMosiac
is
based on mosaic
and needs padding on left and right
to fill the rectangle implied by the convex hull of the plot.
as.likert
methods, a likert
object, which is
a matrix with additional attributes that are needed to make the
barchart
method used by the plot.likert
methods
work with the data. Columns for respondents who
disagree have negated values.
The column of the original data for respondents who
neither agree nor disagree is split into two columns, each containing
halved values---one positive and one negative.
Negative columns come first in the sequence of "No Opinion"(negative)--"Strongly
Disagree",
followed by "No Opinion"(positive)--"Strongly Agree".
There are four
attributes:
"even.col"
indicating whether there were originally an even
number of columns, "n.levels"
the original number of levels,
"levels"
the original levels in the original order, "positive.order"
The sequence in which to display the rows in order to make the right
hand sides progress with high values on top.is.likert
returns a TRUE
or FALSE
value.is.likertCapable
returns a TRUE
or FALSE
value
if the argument can used as an argument to one of the plot.likert
methods.likert
for information on the plot for which
as.likert
prepares the data.
Naomi Robbins
Naomi B. Robbins and Richard M. Heiberger (2011). Plotting Likert and Other Rating Scales. In JSM Proceedings, Section on Survey Research Methods. Alexandria, VA: American Statistical Association.
Luo, Amy and Tim Keyes (2005). "Second Set of Results in from the Career Track Member Survey," Amstat News. Arlington, VA: American Statistical Association.
likert
## Please see ?likert to see these functions used in context.
tmp2 <- array(1:12, dim=c(3,4), dimnames=list(B=LETTERS[3:5], C=letters[6:9]))
as.likert(tmp2) ## even number of levels.
is.likert(tmp2)
is.likert(as.likert(tmp2))
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