=IFERROR(AVG(COLLECT({Score BA}, {Employee Email BA}, $Variable@row, {Date of Review BA}, ISDATE(@cell), {Date of Review BA}, YEAR(@cell) = $[Last Year]$102, {Date of Review BA}, MONTH(@cell) = [Last Year Feb]102), COLLECT({Archive Score}, {Archive Employee email}, $Variable@row, {Archive date of review}, ISDATE(@cell), {Archive date or review}, YEAR(@cell) = $[Last Year]$102, {Archive date of review}, MONTH(@cell) = [Last Year Feb]102))"")