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I-29
•I valori nella tabella sopraindicata possono essere utilizzati all’interno di
espressioni, alla stessa maniera dell’uso di variabili.
u Regressione 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
. .
Temperatura
Pressione
atmosferica
10°C 1003 hPa
15°C 1005 hPa
20°C 1010 hPa
25°C 1011 hPa
30°C 1014 hPa
Per richiamare questo Eseguire questa
tipo di valore: operazione con i tasti:
p
A
X r 1
yσ
n
A X r 2
yσ
n
-1 A X r 3
Coefficiente di regressione A A X r r 1
Coefficiente di regressione B A X r r 2
Solo regressione non quadratica
Coefficiente di correlazione r A X r r 3
m
A X r r r 1
n
A
X r r r 2
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 Eseguire questa
tipo di valore: 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 di regressione C 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
31


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