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Re: [ferret_users] R-square problem

Title: Re: [ferret_users] R-square problem
Hi Ansley,

Yes the values of Rsquare are larger than 1:

yes? stat rsquare
 Total # of data points: 1512 (72*21*1*1)
 # flagged as bad  data: 0
 Minimum value: 0.34722
Maximum value: 1.2
Mean    value: 0.89056 (unweighted average)
 Standard deviation: 0.10312

Any ideas??



On 20/10/09 2:16 AM, "Ansley Manke" <Ansley.B.Manke@xxxxxxxx> wrote:

Hi Ana,
Yes, the values of rsquare should be between 0 and 1.   If you look at the result of

yes? STAT rsquare

are the values really larger than 1?  I wonder if the automatically chosen color fill levels in the FILL command are making the color bar extend higher than 1 even though the values of the data field are not actually larger than 1.

Another possibility is that the accuracy of numeric calculations is putting values slightly larger than 1.  Here too the STAT command might tell us more.


Ana Redondo wrote:
R-square problem Hi,
I am doing a linear regression between two independent variables in order to find out the R-square. This is how I am doing it:
  yes? Let P=var_1
  yes? Let Q=var_2
  yes? Go regresst
  yes? show var
  yes? fill rsquare
But when filling the R-square (and I also list some values to test) I realized that some values are greater than 1!!!!!!!!  Isn’t it R-square the coefficient of determination? If so it should be 0<R^2<1, what I am doing wrong???

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