What is Nodupkey SAS?
The NODUPKEY option removes duplicate observations where value of a variable listed in BY statement is repeated while NODUP option removes duplicate observations where values in all the variables are repeated (identical observations).
What is the use of proc sort in SAS?
PROC SORT first arranges the data set by the values in ascending order, by default, of the first BY variable. PROC SORT then arranges any observations that have the same value of the first BY variable by the values of the second BY variable in ascending order.
What is the difference between Nodup and Nodupkey?
The NODUP option in the SORT procedure eliminates observations that are exactly the same across all variables. The NODUPKEY option eliminates observations that are exactly the same across the BY variables.
How do you duplicate in SAS?
The Sort Procedure with the NODUPKEY option is the simplest and most common way of removing duplicate values in SAS. Simply specify the NODUPKEY option in the PROC SORT statement. In the BY statement, specify the variables by which you want to remove duplicates.
What is a proc sort?
PROC SORT replaces the original data set with a data set that is sorted by employee identification number. The following log shows the results from running this PROC SORT step. Observations Sorted by the Values of One Variable shows the results of the PROC PRINT step.
What is the difference between the nodupkey and noequals options?
Needless to say, the Noequals Option has no effect on single threaded processes. The Nouniquekey Option has the opposite effect of the Nodupkey Option. While the Nodupkey Option removes duplicate observations, the Nouniquekey Option removes any group which contains exactly one item. The effect of the option is best demonstrated with an example.
What is the difference between the nodupkey and the by statement?
While the Nodupkey considers only variabels in the By Statement, the Nodup Option considers entire observations. When Nodup is specified, the Sort Procedure compares the current observation to the previous observation. If the observations matches for all variables, the current observation is left out of the output data set.
What is the nodup option?
When Nodup is specified, the Sort Procedure compares the current observation to the previous observation. If the observations matches for all variables, the current observation is left out of the output data set. The Nodup Option is best demonstrated with an example.
How does the nodupkey option work in Proc sort?
When we examine the PROC SORT Documentation for the Nodupkey Option, we can see that: “The Nodupkey Option checks for and eliminates observations with duplicate BY values”. This means that the Sort Procedure considers only the variables in the By Statement and deletes any duplicate values.