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May 24, 2011 5:55 PM
(529 views)

My question is: will the nonlinear regression algorithm in JMP 8.0.2 work properly with unequally spaced data?

I have used it for fitting some data and it works fairly well. However, it sometimes will not fit the data with the largest time interval very well. It seems to me that the shorter time intervals will effectively be weighted more than the long time intervals because there are more data points per unit time. So I have tried compensating for this by using a weighting function that is 1 for the first interval and then progressively gets larger in proportion to the time interval. This seems to give a better fit (although the SSE is larger) but I haven't analyzed much data yet this way. I am just wondering if I am on the right track?

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May 25, 2011 12:42 AM
(489 views)