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I-31
•I valori nella tabella sopraindicata possono essere
utilizzati all’interno di espressioni, alla stessa maniera
dell’uso di variabili.
uRegressione lineare
La formula di regressione per la regressione lineare è:
y = A + Bx.
Esempio: Relazione tra pressione atmosferica e
temperatura
Eseguire la regressione lineare
per determinare i termini della
formula di regressione ed il
coefficiente di correlazione, per
i dati indicati qui accanto. Di
seguito, utilizzare la formula di
regressione per stimare la
pressione atmosferica a 18°C e
la temperatura a 1000 hPa.
Infine, calcolare il coefficiente
di determinazione (
r
2
) e la
covarianza del campione
.
Nel modo REG:
1
(Lin)
A B 1
(Scl) =
(Stat clear)
Temperatura
Pressione
atmosferica
10°C 1003 hPa
15°C 1005 hPa
20°C 1010 hPa
25°C 1011 hPa
30°C 1014 hPa
La seguente tabella mostra le operazioni con i tasti che
si devono usare per richiamare i risultati, nel caso di
regressione quadratica.
Per richiamare questo tipo di valore:
Eseguire questa operazione con i tasti:
Σx
3
A U r r 1
Σx
2
y A U r r 2
Σx
4
A U r r 3
Coefficiente C di regressione
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
33


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