# LN in Systat

#### mapletreemarty

##### New Member
Hi,

I'm trying to build a non linear model in SYSTAT, my model uses natural logs, so I use the LOG fct., however using the parameter estimates that I was given when I try to use them in the formula I get whacked out answers, and find that they only work when I use Log base 10 in my formula as opposed to LN... why is that?

Thanks

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