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![The Other 27 SAS Numeric Missing Values](https://blogs.sas.com/content/sastraining/files/2017/02/SAS_Numeric_Missing_Values.jpg)
What?!? You mean a period (.) isn't the only SAS numeric missing value? Well, there are 27 others: .A .B, to .Z and ._ (period underscore). Your first question might be: "Why would you need more than one missing value?" One situation where multiple missing values are useful involves survey data. Suppose