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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
.
Température
Pression
atmosphérique
10°C 1003 hPa
15°C 1005 hPa
20°C 1010 hPa
25°C 1011 hPa
30°C 1014 hPa
Dans le mode REG:
1
(Lin)
A B 1
(Scl) =
(Stat clear)
10
P1003 S
Chaque fois que vous appuyez sur S pour
enregistrer la valeur, le nombre de
données saisies jusqu’à ce point est indiqué à
l’écran (valeur n).
15 P 1005 S
20 P1010 S 25 P 1011 S
30 P 1014 S
Coefficient de régression A =
997,4
A X r r 1 =
Coefficient de régression B =
0,56
A X r r 2 =
Coefficient de corrélation r =
0,982607368
A X r r 3 =
Pression atmosphérique à 18°C =
1007,48
18 A X r r r 2 =
Te mpérature à 1000 hPa =
4,642857143
1000 A X r r r 1 =
1.
n=
REG
33


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