Re: [R] in R when I get negative adjusted R^2 using lm, what might be the problem?

2008-11-11 Thread Peter Dalgaard
Tom Backer Johnsen wrote: Greg Snow wrote: No problem, adjusted R-squared can be negative. If there truly is no relationship, then the adjusted R-squared should average to 0, so sometimes it must be negative. All of your R-squared and adjusted R-squared values suggest that there is not much

Re: [R] in R when I get negative adjusted R^2 using lm, what might be the problem?

2008-11-10 Thread Greg Snow
] in R when I get negative adjusted R^2 using lm, what might be the problem? This is a linear regression of Y onto factors... If I take log of Y, and regress onto the factors, I got: Multiple R-squared: 0.4023, Adjusted R-squared: 0.2731 If I don't take log of Y, and directly regress Y

Re: [R] in R when I get negative adjusted R^2 using lm, what might be the problem?

2008-11-10 Thread Tom Backer Johnsen
Greg Snow wrote: No problem, adjusted R-squared can be negative. If there truly is no relationship, then the adjusted R-squared should average to 0, so sometimes it must be negative. All of your R-squared and adjusted R-squared values suggest that there is not much of a relationship (less

[R] in R when I get negative adjusted R^2 using lm, what might be the problem?

2008-11-09 Thread Michael
This is a linear regression of Y onto factors... If I take log of Y, and regress onto the factors, I got: Multiple R-squared: 0.4023, Adjusted R-squared: 0.2731 If I don't take log of Y, and directly regress Y onto the factors, I got: Multiple R-squared: 0.1807, Adjusted R-squared:

Re: [R] in R when I get negative adjusted R^2 using lm, what might be the problem?

2008-11-09 Thread Michael
And in the non-log case, all the previously significant coefficients now became insignificant... On Sun, Nov 9, 2008 at 5:36 PM, Michael [EMAIL PROTECTED] wrote: This is a linear regression of Y onto factors... If I take log of Y, and regress onto the factors, I got: Multiple R-squared: