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kk
kk
k Graphe de régression de puissance
La régression de puissance exprime y comme proportion de la puissance de x. La formule
de régression de puissance standard est y = a × x
b
, et si l’on prend le logarithme des deux
côtés, on obtient ln y = ln a + b × ln x. Ensuite, si l’on suppose que X = ln x, Y = ln y et
A = ln a, la formule correspond à la formule de régression linéaire Y = A + bX.
1(CALC)6(g)4(Pwr)
6(DRAW)
Voici la formule du modèle de régression de puissance.
y = a
x
b
a ............. coefficient de régression
b ............. puissance de régression
r .............. coefficient de corrélation
r
2
............ coefficient de détermination
MSe ........ carrés des moyennes de erreurs
kk
kk
k Graphe de régression sinusoïdale
La régression sinusoïdale est idéale pour les données cycliques.
Voici la formule du modèle de régression sinusoïdale.
y = a·sin(bx + c) + d
Quand la liste de données statistiques est à l’écran, effectuez l’opération de touches
suivante.
1(CALC)6(g)5(Sin)
6(DRAW)
Lors de la représentation d’un graphe de régression sinusoïdale, l’unité d’angle se règle
automatiquement sur les radians (Rad). L’unité d’angle ne change pas quand vous
effectuez un calcul de régression sinusoïdale sans tracer de graphe.
• Le calcul de certains types de données peut durer assez longtemps. C’est normal.
6-3-9
Calcul et représentation graphique de données statistiques à variable double
294


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