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Chapter 7: List Features
7 stdDv(
stdDv(list [, frequency list])
Returns the standard deviation of the specified list items.
Example
• Calculate the standard
deviation using the list items of
list L2.
Note: If relative frequencies or
probabilities are stored in the
frequency list, please use P_stdDv.
8 varian(
varian(list [, frequency list])
Returns the variance of the specified list items.
Example
• Calculate the variance using
the list items of list L2.
9 P_stdDv(
P_stdDv(list [, frequency list])
Returns the population standard deviation of the specified list items.
Example
• Calculate the population
standard deviation using the
list items of list L2.
Standard deviation and variance
Standard deviation: s =
(Estimation)
Variance =
(Estimation)
Population standard deviation: σ=
(Variance in case of complete survey)
where n = number of list items
142
Variance
n
Σ
–
(l
m)
2
k
k = 1
–
1
n
= list item value
l
k
m = mean value of the list
n
Σ
–
(l
m)
2
k
k = 1
n
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