>Hi all
>
>I have a few formulae that need to deviate from the values attained by a simple calculator, the deviation should be a wobble. Cause if it is a one sided deviation then the values over time will be totally out of whack, I want them back to around what the calcualtor would have other wise achieved but never tally with it.
>
>Any ideas?

If I understand correctly, what about something like yourresult=yourresult*(0.95 + (0.1*rand(-1))). This will give you a result which is max ±5% from the correct answer.