What is first dot and last dot in SAS?

What is first dot and last dot in SAS?

VARIABLE assigns the value of 1 for the first observation in a BY group and the value of 0 for all other observations in the BY group. LAST. VARIABLE assigns the value of 1 for the last observation in a BY group and the value of 0 for all other observations in the BY group.

What does first mean in SAS?

When an observation is the first in a BY group, SAS sets the value of the FIRST. variable to 1. This happens when the value of the variable changes from the previous observation. For all other observations in the BY group, the value of FIRST.

What is the first variable?

FIRST. variable = 1 when an observation is the first observation in a BY group. FIRST. variable = 0 when an observation is not the first observation in a BY group.

What does the & mean in SAS?

SAS | How to read character using Ampersand(&) We can use ampersand (&) to notify SAS to read the variable until there are two or more spaces encounter as a delimiter. This technique is always useful when the variable contains two or more words.

What does the period mean in SAS?

In SAS Missing values for numeric variables (including date variables) appear as a period. SAS treats numeric nulls as equal to “the lowest possible number” (essentially negative infinity) when sorting a numeric field. SAS datasets will have a period as a value for missing data.

Can a variable start with a number SAS?

Variable names are just that: they are a name used to refer to a variable in a dataset. When naming a variable in SAS, there are a few rules you must follow: The name cannot contain more than 32 characters. The name can start with a letter or an underscore (_), but cannot start with a number.

How do I get the last observation in SAS?

RUN; The END= last option tells SAS to create a temporary numeric variable called last , which is initialized to 0 and set to 1 only when the SET statement reads the last observation in the input data set. Although we used the variable name last here, we could have used any valid SAS variable name.