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Natural experiment — A natural experiment is an observational study in which the assignment of treatments to subjects has been haphazard: That is, the assignment of treatments has been made by nature , but not by experimenters. Thus, a natural experiment is not a… … Wikipedia
Observational study — In epidemiology and statistics, an observational study draws inferences about the possible effect of a treatment on subjects, where the assignment of subjects into a treated group versus a control group is outside the control of the… … Wikipedia
List of mathematics articles (B) — NOTOC B B spline B* algebra B* search algorithm B,C,K,W system BA model Ba space Babuška Lax Milgram theorem Baby Monster group Baby step giant step Babylonian mathematics Babylonian numerals Bach tensor Bach s algorithm Bachmann–Howard ordinal… … Wikipedia
Paintball — Sport imagesize = 300px caption = Speedball players breaking out at the start of a game union = List of paintball leagues nickname = first = June 27, 1980, Henniker, New Hampshire registered = clubs = contact = No physical contact between players … Wikipedia
Anaerobic digestion — and regenerative thermal oxidiser component of Lübeck mechanical biological treatment plant in Germany, 2007 … Wikipedia
