How much explanation is enough?

Paul Nii-Aryee inquired:

Q. Is an adjusted R value of .25 a decent amount of variation explained? If not, what range of adjusted R does one need to attain before one can say that he has explained a good amount of his dependent variable by his independent variables? I know the paper is not getting graded on getting "fat" adjusted R's but big adjusted R's make the paper much easier to write.

A. Explaining 25% of the variance is quite respectable. But you are correct in understanding that your papers will be graded without reference to the amount of variance you explain or whether your findings are statisticall significant. They will be graded for evidence of understanding what you are doing.