Hi, I'm trying to filter missing values from an excel spreadsheet that I've imported. Initially the missing value was a period (.) and then I changed it to a "na" in the spreadsheet. I've tried to DeleteCases with the command DeleteCases[data,"na"] but this had no effect. I've tried various other approaches based on what I've read on missing value options in documentation. Any suggestions would be much appreaciated. Best, Pat