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stats[describe,variance] - Variance of a Statistical list

Calling Sequence

stats[describe, variance](data)

stats[describe, variance[Nconstraints]](data)

describe[variance](data)

describe[variance[Nconstraints]](data)

Parameters

data

-

statistical list

Nconstraint

-

(optional, default=0) Number of constraints, 1 for sample, 0 for full population

Description

• 

Important: The stats package has been deprecated. Use the superseding package Statistics instead.

• 

The variance command ( variance ) of the stats[describe, ...] subpackage computes the variance of the given data.

• 

The variance is defined to be the square  of the standard deviation.

• 

Classes are assumed to be represented by the class mark, for example 10..12 has the value 11. Missing data are ignored.

• 

The definition of standard deviation varies according to whether it is computed for the whole population, or only for a sample. The parameter Nconstraint provides for this. For more information on the subject, refer to describe[standarddeviation].

• 

The command with(stats[describe],variance) allows the use of the abbreviated form of this command.

Examples

Important: The stats package has been deprecated. Use the superseding package Statistics instead.

withstats:

data1:=1,3,5

data1:=1,3,5

(1)

data2:=2,3,5

data2:=2,3,5

(2)

the first list of data is more dispersed that the second one. Accordingly, its variance is larger

describevariancedata1,describevariancedata2:evalf

2.,3.,5.

(3)

If these were random samples in a larger population, one would use

describevariance1data1,describevariance1data2:evalf

2.,3.,5.

(4)

See Also

describe(deprecated)[coefficientofvariation], describe(deprecated)[mean], describe(deprecated)[standarddeviation], Statistics, Statistics[Variance], transform(deprecated)[classmark]


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