Reference 14 gives the control lines of shewhart mean control chart for skewed population which is unknown based on scaled weighted variance method.

基于尺度赋权方差法给出总体分布有偏并假定总体分布未知情况下休哈特均值控制图的控制限。

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Among them was Mick Thompson, who created Where the People, a time-lapse visualization of zip codes where petitions are being signed, weighted for signatures by percentage of population.

WHITEHOUSE: Looking Back at the White House Hackathon