Stuart Douglas -
The exponential density function f(x) = lambda*EXP(-lambda*x),
or f(x) = EXPONDIST(x,lambda,FALSE).
The cumulative probability p = P(X<=x) = 1 - EXP(-lambda*x),
or p = P(X<=x) = EXPONDIST(x,lambda,TRUE).
For cumulative probability p = P(X<=x), the inverse cumulative is x
= -LN(1-p)/lambda.
- Mike Middleton
http://www.DecisionToolworks.com
Decision Analysis Add-ins for Excel
"Stuart Douglas" <Stuart
wrote in message
...
I am trying to calculate safety stock using an exponential distribution
need
to calculate the safety factor for a desired service level