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Description: Here, we provide you with additional materials (including data and R codes) to the following article: Humberg, S., Dufner, M., Schönbrodt, F. D., Geukes, K., Hutteman, R., Küfner, A. C. P., van Zalk, M. H. W., Denissen, J. J. A., Nestler, S., & Back, M. D. (2019). Is accurate, positive, or inflated self-perception most advantageous for psychological adjustment? A competitive test of key hypotheses. Journal of Personality and Social Psychology, 116(5), 835–859. doi:10.1037/pspp0000204 The folder "Additional OSF materials" contains - detailed result tables for the model comparison analyses (OSF Material 1), - detailed description of the assessment of all variables of interest in the five studies (OSF Material 2), - descriptive statistics of all variables used in the analyses and internal consistencies of the outcome categories (OSF Material 3), - the description of additional analyses for achievement outcomes (OSF Material 4), - information on the nesting of the models in the initial model set (OSF Material 5), - the results of model comparison analyses conducted within the single studies (OSF Material 6), - the parameter estimates and graphs of the full polynomial models for all analyses (OSF Material 7), - a comparison of the results obtained with AIC model evaluation to respective analyses using BIC (OSF Material 8; additional analysis due to a reviewer's question), - a comparison of results obtained with the strict information-theoretic approach to analyses using AIC confidence intervals (OSF Material 9; additional analysis due to a reviewer's question), - and the results of model comparison analyses applying a more conservative outlier treatment (OSF Material 10; additional analysis due to a reviewer's question). The folder "Open data, open code, research transparency" contains - all data and R code needed to reproduce the analyses reported in the manuscript; Researchers interested in reproducing our results are adviced to first consider the file "0_README_Rcode.txt", which contains an overview of the data and R code files. - additional information on the five studies that were used; Researchers interested in additional information on the studies or in information required for the 21 word solution are adviced to start with the file "0_Open_Science_Table.xlsx".