As per Maecker and Trotter...
...is defined as D/W, where D is the difference between positive and negative populations and W is equal to 2 SD of the negative population. And since FCS Express 3 does not offer SD*, we'll have to go commando, using Shapiro's instructions on page 235 of Practical Flow 4th Ed.
Staining Index = (geoMFI pos - geoMFI neg) / 2* (arithmetic mean*CV)
* which is completely fine and reasonable since Version 4 is available.
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