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Moderated regression

Posted by tonishi@iupui.edu on Oct 23, 2012; 5:35am
URL: http://spssx-discussion.165.s1.nabble.com/Alpha-and-mean-inter-item-correlation-tp5715788p5715790.html

Hello, 

I am trying to run moderated regression, but am not confident if I am doing correct and did 2 different ways. My questions are (1) Could anybody let me know which one is correct or if neither is correct what I should do? And (2) which result of "Sig." should I report as related to the coefficients? 

I am attaching one example. Here, a research question is "how EO affects the relationship between DV (VPTOOL2) and affiliation with philanthropic associations."
Also, EO below is labeled as "centEO"[as this was centered] or "INTER_centEO" as part of a moderating (interaction) term, whereas affiliation with philanthropic associations, as "centAFFIL_PHIL".

Thanks much for your help! 


Example 1) 

Model

Unstandardized Coefficients

Standardized Coefficients

t

Sig.

95.0% Confidence Interval for B

Correlations

Collinearity Statistics

B

Std. Error

Beta

Lower Bound

Upper Bound

Zero-order

Partial

Part

Tolerance

VIF

1

(Constant)

9.342

.393

 

23.762

.000

8.560

10.123

 

 

 

 

 

centAFFIL_PHIL

-1.412

.259

-.508

-5.443

.000

-1.928

-.896

-.508

-.508

-.508

1.000

1.000

2

(Constant)

9.344

.396

 

23.597

.000

8.557

10.132

 

 

 

 

 

centAFFIL_PHIL

-1.410

.261

-.508

-5.401

.000

-1.930

-.891

-.508

-.508

-.507

.998

1.002

INTER_centEOxcentAFFIL_PHIL

.042

.311

.013

.134

.894

-.577

.661

.034

.015

.013

.998

1.002

a. Dependent Variable: VPTOOL2

 

Example 2) 

Model

Unstandardized Coefficients

Standardized Coefficients

t

Sig.

95.0% Confidence Interval for B

Correlations

Collinearity Statistics

B

Std. Error

Beta

Lower Bound

Upper Bound

Zero-order

Partial

Part

Tolerance

VIF

1

(Constant)

9.342

.395

 

23.622

.000

8.555

10.128

 

 

 

 

 

centEO

-.018

.457

-.004

-.040

.969

-.927

.891

.023

-.004

-.004

.997

1.003

centAFFIL_PHIL

-1.412

.261

-.509

-5.405

.000

-1.932

-.893

-.508

-.508

-.508

.997

1.003

2

(Constant)

9.345

.398

 

23.456

.000

8.552

10.137

 

 

 

 

 

centEO

-.023

.461

-.005

-.050

.960

-.941

.894

.023

-.006

-.005

.990

1.010

centAFFIL_PHIL

-1.411

.263

-.508

-5.365

.000

-1.934

-.888

-.508

-.507

-.507

.996

1.004

INTER_centEOxcentAFFIL_PHIL

.043

.314

.013

.137

.891

-.582

.668

.034

.015

.013

.991

1.009

a. Dependent Variable: VPTOOL2

 

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