输入1个日期时计算3个月利润的平均值

Question

我有一张不同供应商的利润表，其日期范围为2017年10月至2018年8月。目的是输入一个月并返回前三个月和随后三个月的平均利润。 （例如，输入FEB 2018，平均收益为2017年DEC 2017，JAN 2019，FEB 2018，也平均收益为FEB，MAR，APR 2018）。尝试过hlookup，但似乎不适用于这种情况。请指教。

    OCT 2017    NOV 2017    DEC 2017    JAN 2018    FEB 2018    MAR 2018    APR 2018    MAY 2018    JUN 2018    JUL 2018    AUG 2018                            
Autozone    " $4,653 "  " $5,584 "  " $8,277 "  " $7,564 "  " $7,321 "  " $6,420 "  " $7,568 "  " $3,546 "  " $9,954 "  " $8,849 "  " $2,325 "                          
Walmart " $9,838 "  " $9,979 "  " $2,655 "  " $4,795 "  " $9,811 "  " $8,179 "  " $7,896 "  " $1,689 "  " $7,244 "  " $8,969 "  " $1,189 "                          
Target  " $8,359 "  " $7,683 "  " $4,607 "  " $4,224 "  " $6,221 "  " $8,519 "  " $5,058 "  " $9,184 "  " $9,699 "  " $1,292 "  " $1,080 "                          
Advanced Auto Parts " $3,674 "  " $4,619 "  " $3,817 "  " $8,741 "  " $9,118 "  " $5,542 "  " $1,578 "  " $9,853 "  " $8,153 "  " $4,710 "  " $4,519 "                  

Answer 1

前提：

=AVERAGE(INDEX($2:$5,0,MATCH(H8,1:1,0)):INDEX($2:$5,0,MATCH(H8,1:1,0)-2))

帖子：

=AVERAGE(INDEX($2:$5,0,MATCH(H8,1:1,0)):INDEX($2:$5,0,MATCH(H8,1:1,0)+2))