How to ... calculate a customized statistic calculation from the standard statistics (OpenLAB CDS Intelligent Reporting)

Version 2

    A customer had to use the following formula to calculate the "variance"  of his repeated injection:


    a = Peak area

                                    a(1)  -   a(2)

    Variance(custom) =  ---------------------  x  100



    The result can easily be calculated by multiplying the RSTDEV by  1.41421  and applying the % number format (which will multiply the result by 100)


    The attached document shows the proof of equivalence.


    (originally posted in OpenLAB Forum:

    2012 June 27  by betrich)