User Manual

Simple Moving Average
•
= moving average.
•
m = number of elements in moving average.
•
1
=
x
1
+ x
2
+ x
3
+ ...x
m
m
•
2
=
x
2
+ x
3
+ x
4
+ ...x
m
+ 1
m
•
etc.
Seasonal Variation Factors Based on a Centered Moving Average
•
c
= centered moving average
•
m = number of elements in the centered moving average.
•
c
=
x
1
2
+ (x
2
+ x
3
+ ...x
m
) +
x
m
+ 1
2
m
•
SV = Seasonal variation factor.
•
x
i
= value of the ith data point.
•
i
= centered moving average of the ith data point.
•
SV =
x
i
i
Gompertz Curve Trend Analysis
•
y = ca
(bx)
•
where x, y, a, b, and c are positive.
•
b =
S
3
- S
2
S
2
- S
1
1/n