Chapitre 12. R´ egression lin´ eaire simple et multiple
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--Signif. codes: 0 ‘ *** ’ 0.001 ‘ ** ’ 0.01 ‘ * ’ 0.05 ‘.’ 0.1 ‘ ’ 1
HT est la variable la plus significative.
> add1(lm(BWT∼UI+HT),BWT∼LWT+AGE+UI+SMOKE+HT+FVT1+PTL1,test="F")
Single term additions
Model:
BWT ∼ UI + HT
Df Sum of Sq
RSS
AIC F value
Pr(>F)

88725836 2474.2
LWT
1
3560080 85165756 2468.5 7.7333 0.005982 **
AGE
1
415275 88310561 2475.3 0.8700 0.352184
SMOKE
1
2828310 85897527 2470.1 6.0914 0.014492 *
FVT1
1
698035 88027801 2474.7 1.4670 0.227365
PTL1
1
2682800 86043036 2470.4 5.7683 0.017308 *
--Signif. codes: 0 ‘ *** ’ 0.001 ‘ ** ’ 0.01 ‘ * ’ 0.05 ‘.’ 0.1 ‘ ’ 1
LWT est la variable la plus significative.
> add1(lm(BWT∼UI+HT+LWT),BWT∼LWT+AGE+UI+SMOKE+HT+FVT1+PTL1,
+
test="F")
Single term additions
Model:
BWT ∼ UI + HT + LWT
Df Sum of Sq
RSS
AIC F value Pr(>F)

85165756 2468.5
AGE
1
94703 85071053 2470.3 0.2048 0.65138
SMOKE
1
2579898 82585858 2464.7 5.7480 0.01751 *
FVT1
1
509265 84656491 2469.3 1.1069 0.29414
PTL1
1
2127921 83037835 2465.7 4.7152 0.03118 *
--Signif. codes: 0 ‘ *** ’ 0.001 ‘ ** ’ 0.01 ‘ * ’ 0.05 ‘.’ 0.1 ‘ ’ 1
SMOKE est la variable la plus significative.
> add1(lm(BWT∼UI+HT+LWT+SMOKE),BWT∼LWT+AGE+UI+SMOKE+HT+FVT1+PTL1,
+
test="F")
Single term additions
Model:
BWT ∼ UI + HT + LWT + SMOKE
Df Sum of Sq
RSS
AIC F value Pr(>F)

82585858 2464.7
AGE
1
65305 82520553 2466.5 0.1448 0.70397
FVT1
1
275436 82310423 2466.0 0.6124 0.43491
PTL1
1
1434298 81151560 2463.3 3.2344 0.07375 .
--Signif. codes: 0 ‘ *** ’ 0.001 ‘ ** ’ 0.01 ‘ * ’ 0.05 ‘.’ 0.1 ‘ ’ 1