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La tabla siguiente muestra las operaciones de tecla que
debe usar para llamar los resultados en el caso de una
regresión cuadrática.
Para llamar este tipo de valor:
Realice esta operación de tecla:
Σx
3
A U r r 1
Σx
2
y A U r r 2
Σx
4
A U r r 3
Coeficiente de regresión C
A X r r 3
m
1
A X r r r 1
m2 A X r r r 2
n
A X r r r 3
Los valores en las tablas anteriores pueden usarse
dentro de las expresiones de la misma manera que se
usan las variables.
uRegresión lineal
La fórmula de regresión para la regresión lineal es:
y = A + Bx.
Ejemplo: Presión atmosférica vs. temperatura
Realice la regresión lineal para
determinar los términos de la
fórmula de la regresión lineal y
coeficiente de correlación para los
datos anteriores. Luego, utilice
la fórmula de regresión para
estimar la presión atmosférica a
18°C y temperatura a 1000 hPa.
Finalmente, calcule el
coeficiente de determinación
(
r
2
) y covarianza de muestra
.
Temperatura
Presión
atmosférica
10°C 1003 hPa
15°C 1005 hPa
20°C 1010 hPa
25°C 1011 hPa
30°C 1014 hPa
En el modo REG:
1
(Lin)
A B 1
(Scl) =
(Stat clear)
10
P1003 S
1.
n=
REG
33


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