SAS : Counting Missing and Non Missing Values Row-Wise

This article shows how to calculate the number of missing (blank) and non-missing (non-blank) values in each observation (row) in SAS.

This is a usual task for SAS programmers but it is mostly associated with finding out the number of rows or number of non-missing values across rows. Remember this SAS rule - use PROCs to aggregate a COLUMN. But use FUNCTIONs to aggregate a row.

Let's create a sample data for demonstration -

The program below creates a sample dataset which would be named as TEMP and it would be stored in WORK library.

data temp;
input x y z a b$;
cards;
1 23 24 50 AA
1 . 24 50 AC
1 13 . 50 AB
1 23 . 50 .
;
run;

The sample data looks like below -

Sample Data

Count Missing and Non-Missing NUMERIC Values

The SAS function N calculates the number of non-blank numeric values in each row. To count the number of missing numeric values, you can use NMISS function.

data outdata;
set temp;
nvalues = N(of x--a);
nmiss = nmiss(of x--a);
proc print;
run;

Output

Note - The N(of x--a) is equivalent to N(x, y, z, a). In this case, we are not using the variable b in the above program.

Count Total Missing and Non-Missing values

Suppose you need to calculate number of both character and numeric non-missing and missing values.

Since SAS has no inbuilt function to calculate the number of variables, we need to use PROC CONTENTS to calculate the number of variables. Later we are storing the number of variables information in a macro variable which is totvar.

CMISS Function

The function CMISS counts the number of missing values in each row. It considers missing values of both numeric and character variables.

proc contents data=temp out=cols noprint;
run;
data _null_;
 set cols nobs=total;
 call symputx('totvar', total);
run;
data outdata;
 set temp;
 totalvar=&totvar;
 totmiss=cmiss(of x--b);
 totnonmiss=totalvar- cmiss(of x--b);
proc print ;
run;

SAS : Output

Further Reading : Count Missing Values for Columns

Related Posts

SAS Tutorials : Top 100 SAS Tutorials

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About Author:

Deepanshu founded ListenData with a simple objective - Make analytics easy to understand and follow. He has over 10 years of experience in data science. During his tenure, he worked with global clients in various domains like Banking, Insurance, Private Equity, Telecom and HR.

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