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S-27
u Regresión cuadrática
La fórmula de regresión para la regresión cuadrática es:
y = A + Bx + Cx
2
.
Ejemplo:
Realice la regresión cuadrática para
determinar los términos de la fórmula
de regresión para los datos
proporcionados. Luego, utilice la
fórmula de regresión para estimar los
valores para n (valor estimado de y)
para
xi=16 y m (valor estimado de x)
para
yi=20.
En el modo REG:
r
3
(Quad)
A B 1
(Scl) = (Stat clear)
29
P 1.6 S 50 P 23.5 S
74 P 38.0 S 103 P 46.4 S
118 P 48.0 S
Coeficiente de regresión A =
–35,59856934
A X r r 1 =
Coeficiente de regresión B =
1,495939413
A X r r 2 =
Coeficiente de regresión C =
6,71629667
i
10
–3
A X r r 3 =
n cuando xi es 16 =
–13,38291067
16 A X r r r 3 =
m1 cuando yi es 20 =
47,14556728
20 A X r r r 1 =
m2 cuando yi es 20 =
175,5872105
20 A X r r r 2 =
Precauciones con el ingreso de datos
S S ingresa dos veces el mismo dato.
•También puede ingresar múltiples veces el mismo dato
usando A G. Para ingresar cinco veces los datos “20
y 30” por ejemplo, presione 20
P30 A G 5 S.
Los resultados anteriores pueden obtenerse en cualquier
orden, y no necesariamente como se ha mostrado.
Las precauciones cuando edita el ingreso de datos para
la desviación estándar, también se aplican a los cálculos
de regresión.
No utilice las variables A hasta F, X o Y para almacenar
los datos cuando se realizan cálculos estadísticos. Estas
variables se usan para la memoria temporaria de cálculo,
de manera que cualquier dato que pueda haber asignado
x
i
y
i
29 1,6
50 23,5
74 38,0
103 46,4
118 48,0
29


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