What is the syntax of PROC sort?

PROC SORT DATA=auto OUT=auto3 ; BY DESCENDING foreign ; RUN ; PROC PRINT DATA=auto3 ; RUN ; You can see in the proc print below that the data are now ordered by foreign, but highest to lowest. It is also possible to sort on more than one variable at a time.

Table of Contents

How does proc sort work in SAS?

What Does the SORT Procedure Do? The SORT procedure orders SAS data set observations by the values of one or more character or numeric variables. The SORT procedure either replaces the original data set or creates a new data set. PROC SORT produces only an output data set.

How do you sort the data in SAS?

If you list just one variable, then SAS will sort the observations in the dataset based on ascending values of that variable.
You can sort in descending order by placing the keyword DESCENDING before the variable name that you want the dataset to be sorted on.
You can sort by as many variables as are in the dataset.

How do you sort data in a proc report?

There are two “ORDER” options in PROC REPORT that direct how PROC REPORT output is sorted. These are the ORDER usage, and the ORDER= options. It is important to understand the function of each option, and how the ORDER and ORDER= options work together, to ensure expected results.

How do I sort a table in SAS?

Sort a Table

To sort by a variable, select the variable in the Variables list and click .
To remove a variable from the Sort by list, select the variable and click .
To change the variable’s ascending or descending sort status, select the variable in the Sort by list and click Ascending or Descending.

How do you proc sort ascending?

ASCENDING is the default sort order. In a PROC SORT KEY statement, the ASCENDING option modifies all the variables that it follows. The option must follow the / . In the following example, the x1 variable in the input data set is sorted in ascending order.

Does Proc sort produce a report?

Procedure Output

PROC SORT produces only an output data set. To see the output data set, you can use PROC PRINT, PROC REPORT, or another of the many available methods of printing in SAS.

How do I create an order in SAS?

Method 1 : Proc Format to define Sort Order
The $rank format is created to define custom sort order. The keyword $ is used to tell SAS the values are character. Later, put function is used to apply the manual sort order and ORDER BY is used to sort the variable.

Can you use where in Proc sort?

There are times when it is necessary to subset your data and the SORT procedure allows you to do this by using the WHERE= option or WHERE STATEMENT. Both of these work similarly by selecting observations that meet the condition specified in the WHERE expression before SAS brings them into the PROC SORT for processing.

Can you sort by ascending in SAS?

Sorting in SAS is a process of a simple arrangement where data arranges in ascending or descending sort order. The default order of sorting is ascending (SAS Sort in ascending).

How does proc sort Nodupkey work?

The NODUPKEY option checks for and eliminates observations with duplicate BY variable values. If you specify this option, PROC SORT compares all BY variable values for each observation to those for the previous observation written to the output data set.

How do I remove duplicates in Proc sort?

In PROC SORT, there are two options by which we can remove duplicates. 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 difference between Nodupkey and Noduprecs?

They work similarly in that they both can eliminate unwanted observations, but NODUPRECS compares all the variables in your data set while NODUPKEY compares just the BY variables.

How do you delete duplicates in SAS?

You can use proc sort in SAS to quickly remove duplicate rows from a dataset. This procedure uses the following basic syntax: proc sort data=original_data out=no_dups_data nodupkey; by _all_; run; Note that the by argument specifies which columns to analyze when removing duplicates.

What is Dupout in SAS?

The DUPOUT= option is used with either the NODUPKEYS or NODUPRECS option to name a data set that will contain duplicate keys or duplicate observations. The DUPOUT= option is generally used when the data set is too large for visual inspection. In the next code example, the DUPOUT= and NODUPKEY options are specified.

How do I remove duplicates in a table in SAS?

What is Proc Freq?

Proc FREQ is a procedure that is used to give descriptive statistics about a particular data set. Proc FREQ is used to create frequency and cross-tabulation tables. It enables analysis at various levels. Associations between variables and responses can be tested and computed.

How many ways we can remove duplicates in SAS?

The SORT procedure supports three options for the removal of duplicates: DUPOUT=, NODUPRECS, and NODUPKEYS. PROC SORT’s DUPOUT= option can be used to identify duplicate observations before actually removing them from a data set.

What is Nlevels SAS?

NLEVELS. displays the “Number of Variable Levels” table, which provides the number of levels for each variable named in the TABLES statements. For more information, see the section Number of Variable Levels Table.

What is proc transpose in SAS?

Creates an output data set by restructuring the values in a SAS data set, transposing selected variables into observations. Tip: You can use data set options with the DATA= and OUT= options. For more information, see Statements with the Same Function in Multiple Procedures.

Does Nodupkey keep first record?

The NODUPKEY option instructs the SORT procedure to write only the first observation of each BY group to the output data set and discard any additional observations contained within that BY group.

What is Proc FREQ?

How can you clean invalid data?

How to clean data

Step 1: Remove duplicate or irrelevant observations. Remove unwanted observations from your dataset, including duplicate observations or irrelevant observations.
Step 2: Fix structural errors.
Step 3: Filter unwanted outliers.
Step 4: Handle missing data.
Step 5: Validate and QA.

How do I reorder columns in SAS?

So, how do you reorder variables in a SAS dataset? You change the position of a variable in a SAS dataset with a DATA Step and the RETAIN statement. The RETAIN statement must be placed before the SET statement and is followed by the column names in the desired order.

What is _name_ in SAS?

SAS automatic variable _NAME_ contains the name of the variable being transposed.