SAS : Transpose Multiple Variables

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This tutorial explains how to reshape data by converting multiple variables from long format to wide format. This tutorial explores 'Double Transpose' SAS method which is used to transpose multiple variables. It's a very handy technique to solve this challenge. Otherwise, it would be a very time consuming task. This post includes a sample data set which is used for demonstrating the method for transposing more than one variable.

Create a sample data set

The code below creates a data set named 'temp' which constitutes five variables - ID, TIME, X1, X2, X3.
data temp;
input ID time $ x1-x3;
1 Y1 85 85 86
1 Y2 80 79 70
1 Y3 78 77 87
2 Y1 79 79 79
2 Y2 83 83 85
SAS : Reshape Data

We want to see our output look like the table shown in the image below -
SAS : Transpose Variables
Solution :
proc sort data=temp;
by ID time;

proc transpose data=temp out=out1;
by ID time;
var x1-x3;
proc transpose data=out1 delimiter=_ out=new2(drop=_name_);
by ID;
var col1;
id _name_ time;
How it works :

1. First step, it is required to sort the variables 'ID' 'time' before using them in BY statement in PROC TRANSPOSE. It is done with PROC SORT.

2. In the first transpose of the above code, we are telling SAS to store information of all the variables in a single variable and the respective values in the another variable. And we do not want to transpose variables ID and Time. Hence, we have specified them in BY statement. See the following output generated in this step -

1 Y1 x1 85
1 Y1 x2 85
1 Y1 x3 86
1 Y2 x1 80
1 Y2 x2 79
1 Y2 x3 70
1 Y3 x1 78
1 Y3 x2 77
1 Y3 x3 87
2 Y1 x1 79
2 Y1 x2 79
2 Y1 x3 79
2 Y2 x1 83
2 Y2 x2 83
2 Y2 x3 85

3. Second transpose further reshapes the data from long to wide format. It generates the desired output. The delimiter= option is used to place a separator that separates values of two ID variables.
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