timeFrequency-methods {arulesSequences} | R Documentation |
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.
## S4 method for signature 'timedsequences' timeFrequency(x, type = c("times", "gaps", "mingap", "maxgap", "span")) ## S4 method for signature 'timedsequences' timeTable(x, type = c("times","gaps", "mingap", "maxgap", "span"), itemsets = FALSE) ## S4 method for signature 'timedsequences' firstOrder(x, times = FALSE)
x |
an object. |
type, itemsets, times |
a string (logical) value specifying the type of count. |
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.
Undefined values are not included in the counts, e.g. the mingap
of a sequence with one element only. Thus, except for times
and
gaps
the counts (per item or itemset) always add up to less than
or equal the number of sequences, i.e. length(x)
.
Christian Buchta
Class
sequences
,
timedsequences
,
method
size
,
times
,
itemFrequency
.
## 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)