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d_2: range factors

d_2: range factors
In CC: Control Charts

Description Usage Arguments Value Author(s) References See Also Examples

Description

The sample range R is a biased estimator for the population standard deviation. For a normally distributed sample of size n, R/d2(n) is unbiased.

Usage

1
d_2(n)

Arguments

n

the sample size

Value

a numeric value representing the multiplier to render R unbiased

Author(s)

W.J. Braun

References

Montgomery, D.C. (2000) Introduction to Statistical Quality Control, Wiley

See Also

d_3

Examples

1
2
3
x <- rnorm(10, sd = 3)
R <- diff(range(x))
R/d_2(10)   # expected value of this is 3

CC documentation built on Aug. 27, 2019, 9:02 a.m.

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