2026-04-13T18:20:48Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/347592025-12-05T10:58:11Zcom_2072_1057col_2072_478917col_2072_478932

00925njm 22002777a 4500 dc Solanas Pérez, Antonio author Sierra, Vicenta author Quera, Vicenç (Quera Jordana) author Manolov, Rumen author 2013-04-22T10:28:19Z 2013-04-22T10:28:19Z 2008 2013-04-22T10:28:19Z The present study explores the statistical properties of a randomization test based on the random assignment of the intervention point in a two-phase (AB) single-case design. The focus is on randomization distributions constructed with the values of the test statistic for all possible random assignments and used to obtain p-values. The shape of those distributions is investigated for each specific data division defined by the moment in which the intervention is introduced. Another aim of the study consisted in testing the detection of inexistent effects (i.e., production of false alarms) in autocorrelated data series, in which the assumption of exchangeability between observations may be untenable. In this way, it was possible to compare nominal and empirical Type I error rates in order to obtain evidence on the statistical validity of the randomization test for each individual data division. The results suggest that when either of the two phases has considerably less measurement times, Type I errors may be too probable and, hence, the decision making process to be carried out by applied researchers may be jeopardized. Investigació de cas únic Mètodes estadístics Conducta (Psicologia) Single subject research Statistical methods Human behavior Random assignment of intervention points in two phase single-case designs: data-division-specific distributions