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edited body; edited title
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Michael Hardy
Michael Hardy
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$R^2$ $R^2 = 00$ in 5-th grade polynomial fit

I am now trying to fit a line to some data with Excel. I do this in order to estimate some values within the data range, e.g. X=16 .$X=16.$ As you can see, a 5-th grade polynomial fits very well.

However, when running the regression analysis in Minitab, this same 5-th grade polynomial model gives a PREDICTED $R^2$ = 0 .$R^2 = 0.$ According to Minitab, if this "pred $R^2$" is 0 ,$0,$ then the model has "no power of prediction, even for predictions inside the data range". But looking at the plot it looks like this line can predict very well inside the data range. Am I missing something?

enter image description here

$R^2$ = 0 in 5-th grade polynomial fit

I am now trying to fit a line to some data with Excel. I do this in order to estimate some values within the data range, e.g. X=16 . As you can see, a 5-th grade polynomial fits very well.

However, when running the regression analysis in Minitab, this same 5-th grade polynomial model gives a PREDICTED $R^2$ = 0 . According to Minitab, if this "pred $R^2$" is 0 , then the model has "no power of prediction, even for predictions inside the data range". But looking at the plot it looks like this line can predict very well inside the data range. Am I missing something?

enter image description here

$R^2 = 0$ in 5-th grade polynomial fit

I am now trying to fit a line to some data with Excel. I do this in order to estimate some values within the data range, e.g. $X=16.$ As you can see, a 5-th grade polynomial fits very well.

However, when running the regression analysis in Minitab, this same 5-th grade polynomial model gives a PREDICTED $R^2 = 0.$ According to Minitab, if this "pred $R^2$" is $0,$ then the model has "no power of prediction, even for predictions inside the data range". But looking at the plot it looks like this line can predict very well inside the data range. Am I missing something?

enter image description here

Adding the r-squared tag, changes in heading and body
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edit approved Apr 11, 2017 at 12:51
Ferdi
edit approved Apr 11, 2017 at 12:51
Ferdi
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R-squared $R^2$ = 0 in 5-th grade polynomial fit. Can i still use it?

I am now trying to fit a line to some data with Excel. I do this in order to estimate some values within the data range, e.g. X=16 . As you can see, a 5-th grade polynomial fits very well. 

However, when running the regression analysis in Minitab, this same 5-th grade polynomial model gives a PREDICTED R^2$R^2$ = 0 . According to Minitab, if this "pred R^2"$R^2$" is 0 , then the model has "no power of prediction, even for predictions inside the data range". But looking at the plot it looks like this line can predict very well inside the data range. Am I missing something? Thank you very much!!!

enter image description here

R-squared = 0 in 5-th grade polynomial fit. Can i still use it?

I am now trying to fit a line to some data with Excel. I do this in order to estimate some values within the data range, e.g. X=16 . As you can see, a 5-th grade polynomial fits very well. However, when running the regression analysis in Minitab, this same 5-th grade polynomial model gives a PREDICTED R^2 = 0 . According to Minitab, if this "pred R^2" is 0 , then the model has "no power of prediction, even for predictions inside the data range". But looking at the plot it looks like this line can predict very well inside the data range. Am I missing something? Thank you very much!!!

enter image description here

$R^2$ = 0 in 5-th grade polynomial fit

I am now trying to fit a line to some data with Excel. I do this in order to estimate some values within the data range, e.g. X=16 . As you can see, a 5-th grade polynomial fits very well. 

However, when running the regression analysis in Minitab, this same 5-th grade polynomial model gives a PREDICTED $R^2$ = 0 . According to Minitab, if this "pred $R^2$" is 0 , then the model has "no power of prediction, even for predictions inside the data range". But looking at the plot it looks like this line can predict very well inside the data range. Am I missing something?

enter image description here

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user331789
user331789
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R-squared = 0 in 5-th grade polynomial fit. Can i still use it?

I am now trying to fit a line to some data with Excel. I do this in order to estimate some values within the data range, e.g. X=16 . As you can see, a 5-th grade polynomial fits very well. However, when running the regression analysis in Minitab, this same 5-th grade polynomial model gives a PREDICTED R^2 = 0 . According to Minitab, if this "pred R^2" is 0 , then the model has "no power of prediction, even for predictions inside the data range". But looking at the plot it looks like this line can predict very well inside the data range. Am I missing something? Thank you very much!!!

enter image description here