Performed sample group averaging and fixed uncertainties for groups
Performed sample group averaging and fixed uncertainties for groups

Previously, measurements within a group were averaged along with
averaged uncertainties.

Uncertainties are now a standard error for the group. For a certain
isotope, it is the square root of the sum of squares divided by the
sample size. This provides a smaller uncertainty for a larger group.

yarocoder/radwatch-analysis,bearing/radwatch-analysis,bearing/radwatch-analysis