Excel Magic Trick 371: Average Time Between Customer Orders AVERAGEIF & AVERAGE IF

Описание

Download Files:
https://people.highline.edu/mgirvin/YouTubeExcelIsFun/EMT371-376.xls

See how to calculate the average time between orders for individual customers by adding a new column to the data set with an IF function formula, then use IFERROR and AVERAGEIF (Excel 2007 functions) or AVERAGE and IF function array formula (Excel 2003 formula).
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