Functions to get the names and type of the time scales of a
Lexis object.
timeScales(x)
timeSince(x)
tsNA20( x, all.scales=FALSE )timeScales returns a character vector containing the names of
the variables in x that represent the time scales. Extracted
from the time.scales attribute of the object.
timeSince returns a named character vector, the names being the
names of the timescales and the content being the names of the states
to which the corresponding timescale is defined as time since
entry. For those time scales that are not defined as such an empty
string is used. Hence, if none of the timescales are defined as time
since entry to a state timeSince will return a vector of empty
strings.
an object of class Lexis.
Should NAs in all timescales be replaced by 0? If
FALSE (the default) only timescales defined as time since
entry to a state get NAs replaced by 0s
Martyn Plummer, Bendix Carstensen
Lexis, splitLexis