tcut {survival} | R Documentation |
Attaches categories for person-year calculations to a variable without losing the underlying continuous representation
tcut(x, breaks, labels, scale=1)
x |
numeric/date variable |
breaks |
breaks between categories, which are right-continuous |
labels |
labels for categories |
scale |
Multiply x and breaks by this. |
An object of class tcut
temp1 <- mdy.date(6,6,36) temp2 <- mdy.date(6,6,55)# Now compare the results from person-years # temp.age <- tcut(temp2-temp1, floor(c(-1, (18:31 * 365.24))), labels=c('0-18', paste(18:30, 19:31, sep='-'))) temp.yr <- tcut(temp2, mdy.date(1,1,1954:1965), labels=1954:1964) temp.time <- 3700 #total days of fu py1 <- pyears(temp.time ~ temp.age + temp.yr, scale=1) #output in days py1