TY  - BK
AU  - Cook, T.D.
AU  - Campbell,D.T.
TI  - Quasi-experimentation: design & analysis issues for field settings
SN  - 0-395-30790-2
U1  - 300.72 
PY  - 1979///
CY  - Boston (USA)
PB  - Houghton Mifflin, 
KW  - Social sciences
KW  - AGROVOC
KW  - Experimental design
KW  - Research
N2  - This 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
ER  -