What do you do with missing values in SAS?
The MISSING function enables you to check for either a character or numeric missing value, as in: if missing(var) then do; In each case, SAS checks whether the value of the variable in the current observation satisfies the condition specified. If it does, SAS executes the DO group .
How do you omit observations in SAS?
To remove observations in SAS, you can use the IF statement in a DATA step. Suppose you want to exclude all observations whose scores are greater than 100.
How do I exclude missing values in R?
First, if we want to exclude missing values from mathematical operations use the na. rm = TRUE argument. If you do not exclude these values most functions will return an NA . We may also desire to subset our data to obtain complete observations, those observations (rows) in our data that contain no missing data.
IS NOT null in SAS SQL?
You can use the following basic syntax to select observations in a dataset in SAS where a certain column value is not null: /*select only rows where var1 is not null*/ proc sql; select * from my_data1 where not missing(var1); quit; The following example shows how to use this syntax in practice.
How do I delete missing observations in SAS?
To remove records that have a missing value for a particular character variable, you simply need to use an IF statement to check for blanks, followed by a THEN DELETE statement.
How do you exclude a variable in SAS?
You cannot use the DROP statement in SAS procedure steps. The DROP statement applies to all output data sets that are named in the DATA statement. To exclude variables from some data sets but not from others, use the DROP= data set option in the DATA statement.
Should I use listwise or pairwise deletion?
In listwise deletion a case is dropped from an analysis because it has a missing value in at least one of the specified variables. The analysis is only run on cases which have a complete set of data. Pairwise deletion occurs when the statistical procedure uses cases that contain some missing data.