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2016
It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.
The authors presents a propensity score matching (PSM) technique - an effective method to control the effect of confounding factors in observational studies. PSM has been shown to be as efficient as linear regression analysis, but can be performed using smaller samples. This article presents the basic principles of PSM and its practical application using STATA 13 software for the studies with continuous dependent variable.