In 2002, the No Child Left Behind Act (NCLB) called for "highly qualified" teachers in every classroom in order to increase student outcome and provide equitable learning opportunities to all students including poor and minority students. content and pedagogical knowledge before they come into the classrooms. However, research evidence…

This paper is based on previous studies in applying propensity score methods to study multiple treatment variables to examine the causal moderator effect. The propensity score methods will be demonstrated in a case study to examine the causal moderator effect, where the moderators are categorical and continuous variables. Moderation analysis is an…

Many educational Randomized Controlled Trials (RCTs) collect baseline versions of outcome measures (pretests) to be used in the estimation of impacts at posttest. Although pretest measures are not necessary for unbiased impact estimates in well executed experimental studies, using them increases the precision of impact estimates and reduces sample…