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F-26
Le tableau suivant indique les opérations de touches
nécessaires pour rappeler les résultats dans le cas de
régression quadratique.
Pour rappeler ce type de valeur:
Effectuez cette opération de touches:
Σx
3
A U r r 1
Σx
2
y A U r r 2
Σx
4
A U r r 3
Coefficient de régression C
A X r r 3
m
1
A X r r r 1
m
2
A X r r r 2
n A X r r r 3
Les valeurs dans les tableaux ci-dessus peuvent être
utilisées à l’intérieur d’expressions au même titre que
les variables.
uRégression linéaire
La formule de régression linéaire est : y = A + Bx.
Exemple: Relation pression atmosphérique et
température.
Effectuez une régression
linéaire pour déterminer les
termes de la formule de
régression et le coefficient de
corrélation pour les données ci-
contre. Utilisez ensuite la
formule de régression pour
estimer la pression atmos-
phérique à 18°C et la tempé-
rature à 1000 hPa. Finalement,
calculez le coefficient de
détermination (
r
2
) et la
covariance de l’échantillon
.
Te m pérature
Pression
atmosphérique
10°C 1003 hPa
15°C 1005 hPa
20°C 1010 hPa
25°C 1011 hPa
30°C 1014 hPa
28


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