## What is the lag function in SAS?

A LAG n function stores a value in a queue and returns a value stored previously in that queue. Each occurrence of a LAG n function in a program generates its own queue of values.

### Is there a lead function in SAS?

SAS does not offer a lead function. As a result many SAS programmers sort a data set in descending order and then apply lag functions to create lead values. Often the data are sorted a second time, back to original order, before any analysis is done. For large data sets, this is a costly three-step process.

**How do you use lead in SAS?**

Calculating Lead in SAS Create a sequence of numbers and then sort the sequence by descending order. Then we calculate lag of the variable for which we need to calculate lead. At last, we sort the data by sequence ID.

**What is the opposite of lag function in SAS?**

Though there are some tasks for which SAS does not have functions readily available for use. One such task is to read next record while working on the current record and at the first thought one can imagine an exact opposite processing of data to LAG function, which can be named as LEAD function.

## What is recognition lag?

Recognition lag is the time delay between when an economic shock, such as a sudden boom or bust, occurs and when economists, central bankers, and the government realized that it has occurred.

### What is Intck function in SAS?

Returns the number of interval boundaries of a given kind that lie between two dates, times, or datetime values.

**Why We Use retain in SAS?**

The RETAIN statement simply copies retaining values by telling the SAS not to reset the variables to missing at the beginning of each iteration of the DATA step. If you would not use retain statement then SAS would return missing at the beginning of each iteration. The retain statement keeps the value once assigned.

**What are the 4 policy lags?**

The Lags are: 1. Data lag 2. Recognition lag 3. Legislative lag 4.