My Math Forum Regression coefficient

 January 18th, 2017, 10:03 AM #1 Member   Joined: Jan 2017 From: California Posts: 80 Thanks: 8 Regression coefficient Hi everyone, First I ran a simple regression model. Second I ran a multiple regression model by introducing a new independent variable. Both $R^2$ and $Adjusted$ $R^2$ improved which was a good thing. The coefficient for the simple regression also improved. How can we explain why this coefficient improved? Thanks in advance
 January 18th, 2017, 02:06 PM #2 Member   Joined: Jan 2017 From: California Posts: 80 Thanks: 8 for more precision I meant coefficient of the independent variable
 January 18th, 2017, 02:07 PM #3 Senior Member     Joined: Sep 2015 From: USA Posts: 1,977 Thanks: 1026 some sort of systematic bias in your experiment? like temperature dependent noise or something like that
January 18th, 2017, 02:38 PM   #4
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Quote:
 Originally Posted by romsek some sort of systematic bias in your experiment? like temperature dependent noise or something like that
Nah nothing like that

January 18th, 2017, 02:49 PM   #5
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Quote:
 Originally Posted by dthiaw Nah nothing like that

was it $y = m x$ or $y = m x + b$ ?

January 18th, 2017, 02:55 PM   #6
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Quote:
 Originally Posted by romsek your simple regression was it $y = m x$ or $y = m x + b$ ?
$y=mx + b$

January 18th, 2017, 03:18 PM   #7
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 Originally Posted by dthiaw $y=mx + b$
got me then..

I can see why using 2 degrees of freedom would improve the overall fit but I can't see why that would improve your linear regression.

January 28th, 2017, 07:02 PM   #8
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Quote:
 Originally Posted by dthiaw Hi everyone, First I ran a simple regression model. Second I ran a multiple regression model by introducing a new independent variable. Both $R^2$ and $Adjusted$ $R^2$ improved which was a good thing. The coefficient for the simple regression also improved. How can we explain why this coefficient improved? Thanks in advance

Can you show us the data and/or the printouts?

Or were you actually looking at Pearson's correlation coefficient the second time, and the coefficient of determination the first??

Or maybe you're looking at the regression coefficient between the new independent variable and the dependent variable?

Last edited by 123qwerty; January 28th, 2017 at 07:06 PM.

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