For those of us working with real data, data validation/cleansing is the most time consuming part of the work. Data validation is an important part of any statistical modeling since invalid data results in invalid models no matter how superior your modeling techniques are. Many of us rely on their own codes to go through the data and validate it. My question is: Has anyone come across a software package that can help in data validation. I do realize that a general rule based package can be utilized to do so, but is there something specifically for data validation?