Category Archives: SAS

Uniqueness in data

The SAS-macro below will tell you if a variable in a dataset is unique.

 

SAS crashes when you connect with RDP

If your SAS-session crashes when you connect with RDP to a server the root-cause could be a check that SAS does for available printers.

To avoid these crashes it is possible to set a parameter in the config-file for SAS. The main config-file for SAS is called SASv9.cfg and in SAS 9.2 it’s usually located in C:\Program Files\SAS\SASFoundation\9.2\nls\en.

The parameter you have to add to the config-file is:
-noqueryports

Quote macrovariables e.g. for an IN SQL-statement

The code below lets you qoute the contant of a macrovariables e.g. to be used in an IN SQL-statement.

The macrovariable InStatement will contain ‘age’,’height’,’weight’. And can then be used in an IN SQL-statement.

Getting information about your SAS-installation

Below is a couple of commands that can be used to get information about your SAS-installation.

The Setinit-command will give you information about the SAS-products that your SAS-installation is licensed for.

The Product_status-command will give you information about the SAS-products installed on your system.
Keep in mind that there could be a difference between what’s licensed on your system and what’s actually installed.
The commands above will only give you information about the products installed for base-SAS. If you want information about what other SAS-products is installed on you system, then you can get this SAS-program from SAS and run it on your system.

SAS Encode Password

The code below lets you encode a password in SAS, based on the methods for encoding passwords available in SAS.
You can see a description of the methods for encoding below. Be aware that a password encoded with base64 (sas001) can be very easily discovered.

SASPWEncode

Encoding vs. encryption
PROC PWENCODE uses encoding to disguise passwords. With encoding, one character set is translated to another character set through some form of table lookup. Encryption, by contrast, involves the transformation of data from one form to another through the use of mathematical operations and, usually, a “key” value. Encryption is generally more difficult to break than encoding. PROC PWENCODE is intended to prevent casual, non-malicious viewing of passwords. You should not depend on PROC PWENCODE for all your data security needs; a determined and knowledgeable attacker can decode the encoded passwords.

Encoding is a process of converting one set of meaningful characters into another set. By converting into a different set the characters become unreadable and the meanings of the characters are disguised from the public.
Encryption is a method to transform data from plain text to cipher text through the use of a mathematical algorithmic scheme. Any plain text through encryption process becomes cipher text and is illegible to anyone without a special key.
Though both processes involve converting data from one format to another, encoding process is designed for disguising the data to be revealed casually. Encoding and decoding processes do not require a special key. On the other hand, encryption method is used to protect data from to be revealed to anyone other than the intended recipient. In order to read the encrypted text both the encryption key and the mathematical algorithm are required.
Encoding is intended to disguise data from to be revealed in public. For our purpose, it works well to prevent casual, non-malicious viewing of password in the SAS programs. Because of the special key and mathematical algorithm involved encryption is generally more difficult to break. It is designed for maintaining data confidentiality. Encoding and encryption are developed for different purposes. One should not replace another.

The code below saves a file to  drive containing a %let statement with the encoded password.

 

Reading data from api.statbank.dk into SAS

The code below lets you read data from api.statbank.dk into SAS. api.statbank.dk is an api provided by Statistics Denmark (Danmarks Statistik) for reading their public data.

The code below gets it’s data from the table FOLK1. You can get a list of avaliable tables from this url – http://api.statbank.dk/v1/tables?format=CSV. The code also sets some filters on the tables, some of the information used in this post comes from here.

 

Reading multiple sheets from Excel in SAS

The code below let’s you import the sheets found in an Excel-file to SAS datasets.