I was hoping to be able to use a conditional array (possibly) to get a slope formula to work. I did something similar with the STDEV.S formula... IFERROR(STDEV.S(IF($B2=Sheet2!$B$5:$B$13479,Sheet2!$E$5:$E$13479)),"NO DATA")
but can't get the slope one to work. I have a column of symbols in...