The DIF functions, DIF1, DIF2, ..., DIF100, return the first differences between the argument and its nth lag. DIF1 can also be written as DIF. DIFn is defined as DIFn(x)=x-LAGn(x).

For details about storing and returning values from the LAGn queue, see the LAG function.

Some language elements are supported in SAS but not in CAS. An example is the DATALINES statement. Some examples in this document use DATALINES in SAS to create a data set using the CAS engine. For more information, see Functions in SAS and CAS.

Comparisons

The function DIF2(X) is not equivalent to the second difference DIF(DIF(X)).

Example

This example demonstrates the difference between the LAG and DIF functions.

data two;
   input X @@;
   Z=lag(x);
   D=dif(x);
   datalines;
1 2 6 4 7
;
proc print data=two;
run;

Difference between the DIF and LAG Functions

DIF Function

Syntax

Required Argument

argument

Optional Argument

n

Details

Comparisons

Example

See Also