Minitab formulas regarding anova gage r&r


Hey everyone , im developing an excel macro to basically do the same thing minitab does with the anova gage r&r study but for alot more data.
However i need to know the formula that is used to calculate the NDC and the F part value (i only have one operator) and i for the life of me cannot find these formulas anywhere and yes i've looked through the minitab website but the formulas there are meant to be used if you have more than one operator.
Any kind of help would be appreciated,thank you.
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