survival bias

Is the database designed to prevent survival bias? And is the data all "as of" to avoid look-ahead bias? Thanks.

Richard

Yes, it is. It is guilty of

Yes, it is. It is guilty of some look-ahead bias related to the fact that the fields like PE etc. use Friday closing prices and trades are done using the same prices, but other than that it should be clean.

Survival bias

Are the dead companies (e.g., Enron, Worldcom, etc) included in the database?