Your request seems bizarre to me. If you really want to ignore the actual time intervals, just do your analysis without the actual dates.

If you just want forward-looking time intervals, then put them in the correct index locations.

?diff

c(diff(DF$DATE),1)
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Geoffrey Smith <gps@asu.edu> wrote:

Hello, I have some unbalanced panel data that is measured on weekdays only (i.e., excluding Saturday and Sunday). I would like to get the number of days between dates such that the number of days between a Friday and a Monday is 1 (and not 3). Here is some code to illustrate my problem: library('Hmisc'); DATE <- as.Date(c('2011-05-18','2011-05-19','2011-05-20','2011-05-23','2011-05-24','2011-05-25'), '%Y-%m-%d'); TEMP <- c(100,105,110,95,90,95); DAYS <- weekdays(DATE); DF <- data.frame(DATE, TEMP, DAYS); DF; DF$DAYS.BETWEEN <- DF$DATE - Lag(DF$DATE); DF; Essentially, I want to get it so the variable DAYS.BETWEEN is equal to 1 for observation number 4. Any ideas? Thank you. Geoff 	[[alternative HTML version deleted]]_____________________________________________
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