Linear Regression Halp
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Topic: Linear Regression Halp
Posted By: Hysteria
Subject: Linear Regression Halp
Date Posted: 30 April 2010 at 6:51pm
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Well, it seems I missed the class on transformations or they were never taught to us, so I need a bit of help. 1) Is there any limit to how many different types of transformations can be used in one regression? For instance, I was messing around and log-transformed some variables, left some alone, squared another variable and used the Fisher transformation on yet another. My R squared was like .95, but it seemed like I was cheating a bit. 2) Upon getting the results of the transformed regression, must you do anything to the coefficients or anything before interpreting them, or can you just leave them as is? |
Replies:
Posted By: ParielIsBack
Date Posted: 30 April 2010 at 8:55pm
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I don't know anything about this! CAPITAL LETTERS ------------- BU Engineering 2012 |
Posted By: WGP guy2
Date Posted: 30 April 2010 at 10:02pm
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It sounds like you're in statistics. In that case, my advise is to take a real math class. I don't what the hell you're talking about, but this is how we do linear regressions in real math classes (Numerical Methods): Using the model:  we find:  note ybar is the average value for y and xbar is the average value for x. Edit: Forgot the error calculation:  |
Posted By: usafpilot07
Date Posted: 30 April 2010 at 10:25pm
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We get it, you virgin.
------------- Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo |
Posted By: mbro
Date Posted: 01 May 2010 at 12:24am
 ------------- 
Don't blame me, I voted for Kodos. |
Posted By: Rofl_Mao
Date Posted: 01 May 2010 at 12:32am
We have a WINNAR! |
usafpilot07 wrote:Posted By: Linus
Date Posted: 01 May 2010 at 1:03am
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What the hell? My god I have trouble with college algebra.
I'll just stick with medicine, which ironically, is so much easier for me. ------------- 
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Posted By: Hysteria
Date Posted: 01 May 2010 at 3:24am
Not statistics, econometrics. Yes, I know how to take a real linear regression like you describe. However, if the data are not quite linear (or for many other reasons), you can use real regression technique called http://en.wikipedia.org/wiki/Data_transformation_%28statistics%29 - data http://en.wikipedia.org/wiki/Data_transformation_%28statistics%29 - transformation . |
Posted By: ammolord
Date Posted: 01 May 2010 at 4:36am
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Wow.... Math stopped beaing math when the letters start flying...... ------------- PSN Tag: AmmoLord XBL: xXAmmoLordXx ~Minister of Tinkering With Things That Go "BOOM!"(AKA Minister of Munitions)~ |
Posted By: ParielIsBack
Date Posted: 01 May 2010 at 8:27am
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Pfft, economics. The only reason economists use math is because other people stop listening when the words get too long. ------------- BU Engineering 2012 |
Posted By: WGP guy2
Date Posted: 01 May 2010 at 9:14am
Ah, I see. We touched on that but never went in depth. Of course, you could just use Newton, Lagrange, or natrual spline interp and have essentially 0 error. Damn economists.  |
Posted By: procarbinefreak
Date Posted: 01 May 2010 at 11:30am
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lol at wgp's holier than thou attitude with math. statistics have their place in the world. they're used every day where I work... and are rather important. |
Posted By: WGP guy2
Date Posted: 01 May 2010 at 12:30pm
Oh I didn't say it wasn't important. It's just not real math. |
Posted By: ParielIsBack
Date Posted: 01 May 2010 at 12:36pm
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Newton and Lagrange both suck. I will most certainly be pursuing a career which requires my use of neither. ------------- BU Engineering 2012 |
Posted By: Mack
Date Posted: 01 May 2010 at 3:41pm
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^^^ In that case . . . . . . I do want fries with that.  ------------- 
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Posted By: brihard
Date Posted: 01 May 2010 at 4:35pm
Zzzzzzzing! ------------- "Abortion is not "choice" in America. It is forced and the democrats are behind it, with the goal of eugenics at its foundation." -FreeEnterprise, 21 April 2011. Yup, he actually said that. |