Sharp EL-5060, Руководство по эксплуатации

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– E-28 –
Statistical Calculation Formulas
In the statistical calculation formulas, an error will occur when:
Type Regression formula
Linear y = a + bx
Quadratic y = a + bx + cx
2
Exponential y = a • e
bx
Logarithmic y = a + b • ln x
Power y = a • x
b
Inverse y = a + b —
1
x
• The absolute value of the intermediate result or calculation
result is equal to or greater than 1 × 10
100
.
• The denominator is zero.
• An attempt is made to take the square root of a negative number.
• No solution exists in the quadratic regression calculation.
Normal Probability Calculations
• P( t ), Q( t ), and R( t ) will always take positive values, even
when t <0, because these functions follow the same principle
used when solving for an area.
Values for P(
t
), Q(
t
), and R(
t
) are given to six decimal places.
Σ
x = x
1
+ x
2
+ ··· + x
n
Σ
x 2 = x
1
2 + x
2
2 + ··· + x
n
2
x =
Σ
x
n
Σ
xy
=
x
1
y
1
+
x
2
y
2
+ ··· +
x
n
y
n
Σ
y
=
y
1
+
y
2
+ ··· +
y
n
Σ
y
2 =
y
1
2 +
y
2
2 + ··· +
y
n
2
y =
Σ
y
n
σ
y =
Σ
y 2 – ny 2
n
sy =
Σ
y 2 – ny 2
n – 1
sx =
Σ
x 2 – nx 2
n – 1
σ
x =
Σ
x
2
– nx
2
n
t
σ x
=
x – x
Standardization conversion formula
EL5060E_En0616.pm65 06/16/2004, 13:10 28