Is it possible to fetch old data from variables?

[haruki]

Is it possible to fetch old data from variables?

Example. A rabbit has a life of 7 years.

If 7 years has passed, is it possible to be able to go back and look at how many rabbits was born 7 years back (on year 1),
then remove that amount from the stock in the current year (in the outflow variable "deaths").

More detailed explanation
The current date is now year 7 and the amount of dead rabbits are the same as the amount of born rabbits from year 1, obviously as they were "born" that year.
So, I take the amount of rabbits that was born that year (data from year 1) from the variable "births" and remove that
amount from the population stock, the outflow "deaths".
Then in year 8 i check what the amount of births was in year 2 and remove that amount from the population stock, and so on...

Is this possible in Vensim? Im using Vensim PLE btw.

[Administrator]

I cannot remember what functions are in PLE, but try the delay functions (delay fixed etc).

Hope this helps.

Tony.

[haruki]

works, thnx!