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#1
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Goodness of fit test
I am doing polynomial curve fitting in Excel (2003 and 2007). I have used the
r-squared function, but want the F-value, or F-statistic function. Can someone help? |
#2
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Goodness of fit test
stats4today -
One approach is to create the X^2, X^3, etc. values on your worksheet that has the Y and X data. Then use the Regression tool of the Analysis ToolPak, which provides ANOVA results with and F statistic. (For the Regression tool, the X, X^2, X^3, etc. values must be in adjacent columns.) - Mike http://www.MikeMiddleton.com "stats4today" wrote in message ... I am doing polynomial curve fitting in Excel (2003 and 2007). I have used the r-squared function, but want the F-value, or F-statistic function. Can someone help? |
#3
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Goodness of fit test
On Aug 13, 8:03*am, stats4today
wrote: I am doing polynomial curve fitting in Excel (2003 and 2007). I have used the r-squared function, but want the F-value, or F-statistic function. Can someone help? p = number of predictors = power in this case n = number of points R2 = r-squared value from Excel trendline F = R2/(1-R2)*(n-p-1)/p xt |
#4
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Goodness of fit test
Note that this tests whether the entire model fits better than just a simple
mean. It does not test whether there are too many or too few polynomial terms in the model. For that, see Mike's answer. Jerry "Xt" wrote: On Aug 13, 8:03 am, stats4today wrote: I am doing polynomial curve fitting in Excel (2003 and 2007). I have used the r-squared function, but want the F-value, or F-statistic function. Can someone help? p = number of predictors = power in this case n = number of points R2 = r-squared value from Excel trendline F = R2/(1-R2)*(n-p-1)/p xt |
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