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Table 3

Coefficient estimates and fit statistics for the pooled OLS model, FEM and REM

ParameterPooled OLS model
FEM
REM
CoefficientStd. errorCoefficientStd. errorCoefficientStd. error
Constant 7.57 × 10−1 1.07 × 10−2   7.59 × 10−1 2.47 × 10−2 
PSize 2.01 × 10−4 4.96 × 10−6   2.01 × 10−4 1.13 × 10−5 
IReq 1.17 × 10−2 3.54 × 10−3 1.23 × 10−2 2.80 × 10−3 1.23 × 10−2 2.80 × 10−3 
PSize*IReq 8.37 × 10−5 1.64 × 10−6 8.40 × 10−5 1.29 × 10−6 8.40 × 10−5 1.29 × 10−6 
R2 0.250  0.074  0.084  
p-value 0.000  0.000  0.000  
F-test for individual effects   <0.000    
Lagrange multiplier test     <0.000  
Hausman test     0.068  
Theta     0.829  
ParameterPooled OLS model
FEM
REM
CoefficientStd. errorCoefficientStd. errorCoefficientStd. error
Constant 7.57 × 10−1 1.07 × 10−2   7.59 × 10−1 2.47 × 10−2 
PSize 2.01 × 10−4 4.96 × 10−6   2.01 × 10−4 1.13 × 10−5 
IReq 1.17 × 10−2 3.54 × 10−3 1.23 × 10−2 2.80 × 10−3 1.23 × 10−2 2.80 × 10−3 
PSize*IReq 8.37 × 10−5 1.64 × 10−6 8.40 × 10−5 1.29 × 10−6 8.40 × 10−5 1.29 × 10−6 
R2 0.250  0.074  0.084  
p-value 0.000  0.000  0.000  
F-test for individual effects   <0.000    
Lagrange multiplier test     <0.000  
Hausman test     0.068  
Theta     0.829  
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