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re: Excel help
Posted on 9/15/15 at 11:23 am to Sigma
Posted on 9/15/15 at 11:23 am to Sigma
Interesting association.
I'm sure you're aware of R-squared, residual plots, etc - check those.
If you're trying to make a prediction, I'd steer away from using high degree polynomials. I don't know if this is something that is common in your line of work but high degree polynomials are pretty misleading.
I'm sure you're aware of R-squared, residual plots, etc - check those.
If you're trying to make a prediction, I'd steer away from using high degree polynomials. I don't know if this is something that is common in your line of work but high degree polynomials are pretty misleading.
1
Posted on 9/15/15 at 12:50 pm to NoFlexZone
quote:
I get 68,167 using an exponential function. Just using the "Add trend line" in XLS. The equation is 5E+10e^-2.154x R Sq = 0.9991
This was part of my problem. Several other types of regressions would work, just the calculation using the 4th order fit was crazy.
quote:
If you're trying to make a prediction, I'd steer away from using high degree polynomials. I don't know if this is something that is common in your line of work but high degree polynomials are pretty misleading.
My knowledge of statistics is admittedly poor, but the plotted data are very smooth. I can read off the Y value using the given X value and be within 5%. I was just looking to understand the math I suppose. Thanks for your help.
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