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

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