Lab #6
Collinearity example

dep. var. = IM; DF for t = 23
R?SQ. = 0.6728
               b           se           t
constant   67.718264    24.806802    2.729826
pc gdp     -0.002028     0.001303   -1.556324   .10 < p < .20
1 Tel per   0.116216     0.061211    1.898616   .05 < p < .10
1 HB per    0.003556     0.009209    0.386124   p > .20
urban      -0.333347     0.444469   -0.749989   p > .20

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      correlations among indep. vars.
             gdp    tel    hb     urb
pc gdp       1     -0.439 -0.431  0.755
1 tel per   -0.439  1      0.767 -0.728
1 hb per    -0.431  0.767  1     -0.656
urban        0.755 -0.728 -0.656  1

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dep. var. = IM; DF for t = 25
R?SQ. = 0.6611
                b           se          t
constant    52.429829    8.137885    6.442685
pc gdp      -0.002787    0.000900   -3.098355   .001 < p < .01
1 Tel per    0.157393    0.036905    4.264788   p < .001

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dep. var. = IM; DF for t = 25
R?SQ. = 0.5716
                b           se          t
constant    53.224448   10.042609    5.299862
pc gdp      -0.003157    0.0010072  -3.134392   .001 < p < .01
1 hb per     0.021207    0.0070058   3.027116   .001 < p < .01
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