Computed statistics

One-variable

Statistic

Definition

 

 

NΣ

Number of data points.

TOTΣ

Sum of data values (with their

 

frequencies).

MEANΣ

Mean value of data set.

PVARΣ

Population variance of data set.

SVARΣ

Sample variance of data set.

PSDEV

Population standard deviation of

 

data set.

SSDEV

Sample standard deviation of data

 

set.

MINΣ

Minimum data value in data set.

Q1

First quartile: median of values to

 

left of median.

MEDIAN

Median value of data set.

Q3

Third quartile: median of values to

 

right of median.

MAXΣ

Maximum data value in data set.

When the data set contains an odd number of values, the data set’s median value is not used when calculating Q1 and Q3 in the table above. For example, for the following data set:

{3,5,7,8,15,16,17}

only the first three items, 3, 5, and 7 are used to calculate Q1, and only the last three terms, 15, 16, and 17 are used to calculate Q3.

10-14

Statistics aplet