Forecasting; Simple Moving Average; Seasonal Variation Factors Based On A Centered Moving Average; Gompertz Curve Trend Analysis - HP 12c Platinum Reference Manual
Hp 12c platinum: reference guide
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Appendix B
Forecasting
Simple Moving Average
x =
moving
=
m
number
+
x
1
=
x
1
+
x
2
=
x
2
etc.
Seasonal Variation Factors Based on a Centered Moving Average
=
x
centered
c
m = number of elements in the centered moving average.
x
1
+
2
=
x
c
SV = Seasonal variation factor.
x
= value of the ith data point.
i
=
x
centered
i
x
SV =
i
x
i
Gompertz Curve Trend Analysis
( )
x
b
y =
ca
where x, y, a, b, and c are positive.
−
S
3
=
b
−
S
2
=
c
exp
=
a
exp
where S
, S
1
average.
of
elements
in
moving
+
+
+
x
x
...
x
2
3
m
m
+
+
+
x
x
...
x
−
3
4
m 1
m
moving
average
(
)
+
+
+
x
x
...
x
2
3
m
m
moving
average
/ 1
n
S
2
S
1
2
−
1
S
S
S
1
3
2
+
−
n
S
S
2
S
1
3
2
(
)(
)
−
−
b
1
S
S
2
1
(
)
2
n
−
b
b
1
, and S
are:
2
3
average.
x
+
m
1
+
2
of
the
i
th
data
point.
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