>>In Excel LOGEST() is used to perform exponential regression on a set of data points. If worst came to worst I could automate Excel, but I'd rather avoid it:
>>
>>- its accuracy is doubtful (www.npl.co.uk/npl/publications/news/ise/countingonit_issue9.pdf)
>>- Excel may not be available
>>
>>Has anyone implemented anything like this in VFP? Is there an external library/.DLL callable from VFP? I've started to look into BLAS and the Intel MKL but they look like vast overkill.
>>
>>TIA.
>
>If you know how to do a linear regression in VFP (I don't), you might be able to do something similar to the following:
>
>

Take the natural logarithm of every data item,
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Do the linear regression on the result,
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Take the anti-logarithm (exp()) of the result or result set.
>
>HTH, Hilmar.

Hmmm... an interesting approach, but I'm not sure they are mathematically equivalent.

Regards. Al

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