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Microsoft Excel (MS Excel) control chart time series analysis may measure ‘abnormal’ customer behaviour. An MS Excel control chart compares purchases, calls or other measures to upper or lower ‘normal’ control limits. Behaviour is ‘not normal’ if outside an MS Excel control chart’s upper or lower control limits for at least three consecutive periods (eg. days, months). A “search Youtube for control chart excel” videos about doing a Microsoft Excel (MS Excel) control chart data … Read market research »