mst@fyi:~$ calculate true_value_probability

Specification probability from method R.

Estimate how likely the true value is inside specification after one analysis result, using method reproducibility R as the measurement precision input.

OIV validation protocol NIST TN 1816 default: R = 2.8 x sR

Inputs

same units

Analysis result Method precision input Interpret precision input as Number of independent results averaged

Lower spec limit Upper spec limit

Assumption: the result is unbiased and normally distributed around the true value. The calculator estimates the posterior probability of the true value using a flat prior. Method bias, sampling error, and non-normal tails are not included.

Result

one-sided upper spec

Probability true value is in spec -- --

Effective standard uncertainty -- --

Distance to nearest limit -- --

Probability out of spec -- --

Enter a result, method R, and at least one spec limit.