Posted by: lootekukur December 11, 2007
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hahahaha...
bibas and geico,
i feel that the question is not fully self-explanatory and after some thought to it, i am still adamant with my analysis. i feel it this way:
1) the F-stat should decrease if the independent variable is non-significant (from null-hypothesis) to the overall predictor...coz of the things i have already explained. bibas, the explanatory power doesn't come into play in this case.
2) if it is significant, then according to what geico put forth, it can lead to both increase or decrease to F-stat...but since we choose lesser MSreg model so again, we are looking at decreasing SSreg (which means decrease in MSreg and since MSerror is also decreasing), again the net effect to F-stat is decrement.
and bibas, where does your formula come from? hahaha i strongly suggest you to go back and check your stat book of UG years...i am sure you had taken the course. you have already mentioned in one of your earlier posts, that "Addition of independent variables will cost degrees of freedom but will also have added explanatory power and thus, increasing the ESS and decreasing the RSS."
you do your own math now provided if you know the formula for F-stat
and also let it be known that no one (at least till now) is expert in here ... my study doesn't relate to stat at all...what i am explaining is based on what i studied during my sophomore years which is a good 6 years ago...and on another note, last i heard of you in sajha somewhere, you were an aspiring economist/analyst or sth?
bibas and geico,
i feel that the question is not fully self-explanatory and after some thought to it, i am still adamant with my analysis. i feel it this way:
1) the F-stat should decrease if the independent variable is non-significant (from null-hypothesis) to the overall predictor...coz of the things i have already explained. bibas, the explanatory power doesn't come into play in this case.
2) if it is significant, then according to what geico put forth, it can lead to both increase or decrease to F-stat...but since we choose lesser MSreg model so again, we are looking at decreasing SSreg (which means decrease in MSreg and since MSerror is also decreasing), again the net effect to F-stat is decrement.
and bibas, where does your formula come from? hahaha i strongly suggest you to go back and check your stat book of UG years...i am sure you had taken the course. you have already mentioned in one of your earlier posts, that "Addition of independent variables will cost degrees of freedom but will also have added explanatory power and thus, increasing the ESS and decreasing the RSS."
you do your own math now provided if you know the formula for F-stat
and also let it be known that no one (at least till now) is expert in here ... my study doesn't relate to stat at all...what i am explaining is based on what i studied during my sophomore years which is a good 6 years ago...and on another note, last i heard of you in sajha somewhere, you were an aspiring economist/analyst or sth?