| perstat | R Documentation | 
Calculates occurrence / exposure rates for time periods given by
period and for ages given by age.
perstat(surv, period, age = c(0, 200))
| surv | An (extended)  | 
| period | A vector of dates (in decimal form) | 
| age | A vector of length 2; lowest and highest age | 
A list with components
| events | No. of events in eavh time period. | 
| exposure | Exposure times in each period. | 
| intensity | 
 | 
Göran Broström
piecewise
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