@article{BrunnerKellerWengeretal.2017,
  author    = {Brunner, Martin and Keller, Ulrich and Wenger, Marina and Fischbach, Antoine and L{\"u}dtke, Oliver},
  title     = {Between-School Variation in Students' Achievement, Motivation, Affect, and Learning Strategies},
  series = {Journal of research on educational effectiveness / Society for Research on Educational Effectiveness (SREE)},
  volume    = {11},
  journal   = {Journal of research on educational effectiveness / Society for Research on Educational Effectiveness (SREE)},
  number    = {3},
  publisher = {Routledge, Taylor \& Francis Group},
  address   = {Abingdon},
  issn      = {1934-5747},
  doi       = {10.1080/19345747.2017.1375584},
  pages     = {452 -- 478},
  year      = {2017},
  abstract  = {To plan group-randomized trials where treatment conditions are assigned to schools, researchers need design parameters that provide information about between-school differences in outcomes as well as the amount of variance that can be explained by covariates at the student (L1) and school (L2) levels. Most previous research has offered these parameters for U.S. samples and for achievement as the outcome. This paper and the online supplementary materials provide design parameters for 81 countries in three broad outcome categories (achievement, affect and motivation, and learning strategies) for domain-general and domain-specific (mathematics, reading, and science) measures. Sociodemographic characteristics were used as covariates. Data from representative samples of 15-year-old students stemmed from five cycles of the Programme for International Student Assessment (PISA; total number of students/schools: 1,905,147/70,098). Between-school differences as well as the amount of variance explained at L1 and L2 varied widely across countries and educational outcomes, demonstrating the limited generalizability of design parameters across these dimensions. The use of the design parameters to plan group-randomized trials is illustrated.},
  language  = {en}
}
@article{KretschmannVockLuedtkeetal.2019,
  author    = {Kretschmann, Julia and Vock, Miriam and L{\"u}dtke, Oliver and Jansen, Malte and Gronostaj, Anna},
  title     = {Effects of grade retention on students' motivation: A longitudinal study over 3 years of secondary school},
  series = {The journal of educational psychology},
  volume    = {111},
  journal   = {The journal of educational psychology},
  number    = {8},
  publisher = {American Psychological Association},
  address   = {Washington},
  issn      = {0022-0663},
  doi       = {10.1037/edu0000353},
  pages     = {1432 -- 1446},
  year      = {2019},
  abstract  = {Despite the fact that grade retention is now seen as controversial in many quarters, it remains common practice in numerous countries. Previous research on the effects of grade retention on student development has, however, generated ambiguous results, particularly in terms of motivational outcomes. This ambiguity has been attributed in part to a lack of high-quality studies including a longitudinal design, a suitable comparison group, and adequate statistical control of preretention differences. Based on longitudinal data of N = 3,288 German students over 3 years of secondary school, we examined differences in their academic self-concept, scholarly interests, learning motivation, and achievement motivation between those being retained in the 6th grade (n = 61) and those of the same age being promoted annually. To account for confounding variables, we applied full propensity score matching on baseline measures of the dependent variables, as well as various other covariates that have been found to be associated with the risk of retention (e.g., cognitive ability, academic performance, and family background variables). Results reveal a steep decline in students' academic self-concept, interests, and learning motivation during the last months spent in the original class, just before retention. For those measures that were available, negative effects were still partly significant after 1 year, but had diminished 2 years after grade retention. Contrary to predictions suggested by the big-fish-little-pond effect, we found no positive effects of retention on students' academic self-concept.},
  language  = {en}
}