"Reliable data" refers to information that you can trust and depend on because it is accurate, correct, and collected in a consistent and trustworthy manner. Full definition
In addition, schools need to develop clear standards, which can check the effectiveness of the teaching and learning process, as well as provide reliable data on student progress. (blog.foxspecialedlaw.com)
We've got a single sample of reliable data showing rapid warming: late 20th century. (johnquiggin.com)
This collection of properties will be the most reliable data for determining the probable sale price of a similar property in the current market. (ourvalleyhomes.net)