![SAS author's tip: variable criteria](https://blogs.sas.com/content/sastraining/files/2011/11/Svolbacover22011.jpg)
This week's SAS author's tip comes from Gerhard Svolba, author of Data Preparation for Analytics Using SAS and the upcoming book Data Quality for Analytics Using SAS. Gerhard is a product manager and pre-sales consultant at SAS in Austria. Gerhard wrote his first book on analytics about five years ago and