itemFrequencyPlot | R Documentation |
Provides the generic function itemFrequencyPlot()
and the method to
create an item frequency bar plot for inspecting the item frequency
distribution for objects based on itemMatrix (e.g.,
transactions, or items in itemsets
and rules).
itemFrequencyPlot(x, ...)
## S4 method for signature 'itemMatrix'
itemFrequencyPlot(
x,
type = c("relative", "absolute"),
weighted = FALSE,
support = NULL,
topN = NULL,
population = NULL,
popCol = "black",
popLwd = 1,
lift = FALSE,
horiz = FALSE,
names = TRUE,
cex.names = graphics::par("cex.axis"),
xlab = NULL,
ylab = NULL,
mai = NULL,
...
)
x |
the object to be plotted. |
... |
further arguments are passed on (see
|
type |
a character string indicating whether item frequencies should be displayed relative of absolute. |
weighted |
should support be weighted by transactions weights stored as
column |
support |
a numeric value. Only display items which have a support of
at least |
topN |
a integer value. Only plot the |
population |
object of same class as |
popCol |
plotting color for population. |
popLwd |
line width for population. |
lift |
a logical indicating whether to plot the lift ratio between
instead of frequencies. The lift ratio is gives how many times an item is
more frequent in |
horiz |
a logical. If |
names |
a logical indicating if the names (bar labels) should be displayed? |
cex.names |
a numeric value for the expansion factor for axis names (bar labels). |
xlab |
a character string with the label for the x axis (use an empty string to force no label). |
ylab |
a character string with the label for the y axis (see xlab). |
mai |
a numerical vector giving the plots margin sizes in inches (see ‘? par’). |
A numeric vector with the midpoints of the drawn bars; useful for adding to the graph.
Michael Hahsler
itemFrequency()
Other itemMatrix and transactions functions:
abbreviate()
,
c()
,
crossTable()
,
duplicated()
,
extract
,
hierarchy
,
image()
,
inspect()
,
is.superset()
,
itemFrequency()
,
itemMatrix-class
,
match()
,
merge()
,
random.transactions()
,
sample()
,
sets
,
size()
,
supportingTransactions()
,
tidLists-class
,
transactions-class
,
unique()
data(Adult)
## the following example compares the item frequencies
## of people with a large income (boxes) with the average in the data set
Adult.largeIncome <- Adult[Adult %in% "income=large"]
## simple plot
itemFrequencyPlot(Adult.largeIncome)
## plot with the averages of the population plotted as a line
## (for first 72 variables/items)
itemFrequencyPlot(Adult.largeIncome[, 1:72],
population = Adult[, 1:72])
## plot lift ratio (frequency in x / frequency in population)
## for items with a support of 20% in the population
itemFrequencyPlot(Adult.largeIncome,
population = Adult, support = 0.2,
lift = TRUE, horiz = TRUE)
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