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020			_a0-395-30790-2
040			_aMX-TxCIM
041			_aeng
082			_a300.72 _bCOO
100			_927836 _aCook, T.D.
245	1	0	_aQuasi-experimentation : _bdesign & analysis issues for field settings
260			_bHoughton Mifflin, _c1979. _aBoston (USA) :
300			_axii, 405 pages
520			_aThis book presents some quasi-experimental designs and design features that can be used in many social research settings. The designs serve to probe causal hypotheses about a wide variety of substantive issues in both basic and applied research. Each design is assessed in terms of four types of validity, with special stress on internal validity. Although general conclusions are drawn about the strengths and limitations of each design, emphasis is also placed on the fact that the relevant threats to valid inference are specific to each research setting. Consequently, a threat that is usually associated with a particular design need not invariably be associated with that design.
546			_aText in English
650		7	_aSocial sciences _2AGROVOC _916574
650		7	_aExperimental design _2AGROVOC _94741
650		7	_aResearch _2AGROVOC _99142
700	1		_927837 _aCampbell, D.T.
942			_cBK _n0 _2ddc
999			_c65402 _d65394