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Analysis of covariance --- Analyse de la covariance

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Estimation of average treatment effects in observational, or non-experimental in pre-treatment variables. If the number of pre-treatment variables is large, and their distribution varies substantially with treatment status, standard adjustment methods such as covariance adjustment are often inadequate. Rosenbaum and Rubin (1983) propose an alternative method for adjusting for pre-treatment variables based on the propensity score conditional probability of receiving the treatment given pre-treatment variables. They demonstrate that adjusting solely for the propensity score removes all the bias associated with differences in pre-treatment variables between treatment and control groups. The Rosenbaum-Rubin proposals deal exclusively with the case where treatment takes on only two values. In this paper an extension of this methodology is proposed that allows for estimation of average causal effects with multi-valued treatments while maintaining the advantages of the propensity score approach.

Analysis of covariance. --- Therapeutics

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Analysis of covariance --- Analysis of covariance. --- Statistique mathématique --- Mathematical statistics --- Analyse de covariance --- Statistique mathématique

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Analysis of variance. --- Analysis of covariance.

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Professor Herschel Knapp offers an analysis approach to use when a potentially confounding variable mixes with the data set. This 8th chapter of the nursing statistics series focuses on how to run an ANCOVA test in SPSS.

Nursing --- Analysis of covariance. --- Research --- Statistical methods.