mqr.spc.XBarParams.

from_stddev

static XBarParams.from_stddev(centre, s_bar, nobs, nsigma=3)

Constructs XBarParams from an average sample stddev.

Parameters:

centrefloat

Process target mean.

s_barfloat

Average sample stddev from a reference in-control process.

nobsint

Size (fixed) of samples used to calculate (s_bar).

nsigmafloat

Number of stderr to set control limits.