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HP 12C - Section 12: Real Estate and Lending

HP 12C
165 pages
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155
Simple Moving Average
X = moving average.
m = number of elements in moving average.
•etc.
Seasonal Variation Factors Based on a Centered Moving Average
X
c
= centered moving average
m = number of elements in the centered moving average.
SV = Seasonal variation factor.
x
i
= value of the ith data point.
i = centered moving average of the ith data point.
Gompertz Curve Trend Analysis
y = ca
(bx)
•where x, y, a, b, and c are positive.
X
1
X
1
X
2
X
3
X+
nmm
++
m
-------------------------------------------------------=
...x
m
X
2
X
1
X
2
X
3
X+
nmm
1++ +
m
-----------------------------------------------------------------=
...x
m
X
c
X
1
2
------ X
2
X
3
X
MM
++()
X
m
1+
2
-----------------++
m
---------------------------------------------------------------------------------------=
...x
m
SV
X
i
X
i
-----=
b
S
3
S
2
S
2
S
1
-------------------


1
n
---
=
D
t
S
t
1a()
α
----------------- T
t
+=

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