This function computes the process standard deviation and is used internally by the function precision.grubbs.ncb.od.

1 | ```
process.sd(x)
``` |

`x` |
A matrix or numeric data.frame consisting of an n (no. of items) by N (no. of methods) matrix of measuremnts. |

The process standard deviation is the standard deviation of the true values uncontaminated by measurement error. See Jaech, p. 185.

A scalar containing the method of moments estimate of the process standard deviation.

Richard A. Bilonick

Jaech, J. L. (1985) *Statistical Analysis of Measurement Errors*. New York: Wiley.

1 2 | ```
data(pm2.5)
process.sd(pm2.5) # estimate of the sd of the "true values using the method of moments")
``` |

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