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The value of R square would not decrease when more variables are added to the model. As a result, there is always a temptation to add more variables in the model, because of which problem can arise therefore in that case Adjusted R2 is used as a measure.
A rule of thumb for small values of R-squared: If R-squared is small (say 25% or less), then the fraction by which the standard deviation of the errors is less than the standard deviation of the dependent variable is approximately one-half of R-squared, as shown in the table above.