How to STDEV on different ranges using Excel formulas?
Consider an Excel file in which we have different group of numbers and we want to calculate STDEV for each rang using a formula. The process is as follow,

=IF(A1="",STDEVA(INDIRECT(CELL("address",A2)&":A"&SMALL(IF(A2:A200="",ROW(A2:A200),""),1)-1)),"")
Note: This is an array formula and should be inserted with Ctrl+Shift+Enter
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