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The basic evaluation model
Validity in social research
The regression discontinuity design
The nonequivalent control group design
The postonly correlational design
absence of treatment analysis of covariance analysis of variance ANCOVA applied research applied social research assess assignment variable assumed assumption autoregressive process causal effects change score analysis comparison condition comparison group conclusion errors conclusion validity construct validity control group design cutting point day-care center dummy coding estimate of treatment evaluation example independent variables instance instrumental variables interaction internal validity linear measurement error mediational ment moving-average process multiple regression nonequivalent control group nonindependence observations omitted variable operationalized outcome measure outcome variable partial autocorrelations post-only correlational design pre-treatment measure predictor pretest difference problem procedure random assignment rule randomized experiments randomly regression adjustment regression coefficient regression discontinuity design regression equation reliability research designs residual sample serial dependency source of bias statistical Table tion transformed treated subjects treatment conditions treatment effects treatment groups treatment variable Type I errors uncorrelated unmeasured untreated variation zero