arulesSequences (version 0.2-31)

timeFrequency-methods: Count Event Times

Description

timeFrequency counts the number of occurrences of event times, of the time gaps between the events of a sequence, the minimum or maximum gap of a sequence, or the span of a sequence.

timeTable cross-tabulates the above statistics for items or itemsets. For items the sequences are reduced to the events containing the item.

firstOrder computes a first order model, i.e. a table of counts of state changes among a collection of timed sequences, where the elements or the times can be the states.

Usage

# S4 method for timedsequences
timeFrequency(x, type = c("times", "gaps", "mingap", "maxgap",
                          "span"))
# S4 method for timedsequences
timeTable(x, type = c("times","gaps", "mingap", "maxgap", "span"),
	  itemsets = FALSE)
# S4 method for timedsequences
firstOrder(x, times = FALSE)

Value

For timeFrequency returns a vector of counts corresponding with the set of distinct event times, the set of gaps or spans as indicated by the names attribute.

For timeTable returns a table of counts with the rownames corresponding with the reference set of distinct items or itemsets.

For firstOrder a matrix of counts corresponding with the set of distinct itemsets or event times.

Arguments

x

an object.

type, itemsets, times

a string (logical) value specifying the type of count.

Author

Christian Buchta

See Also

Class sequences, timedsequences, method size, times, itemFrequency.

Examples

## continue example
example("timedsequences-class")

## totals
timeFrequency(z)
timeFrequency(z, "gaps")
timeFrequency(z, "span")

## default items
timeTable(z)
timeTable(z, "gaps")
timeTable(z, "span")

## beware of large data sets
timeTable(z, itemsets = TRUE)


## first order models
firstOrder(z)
firstOrder(z, times = TRUE)