TY  - JOUR
A1  - Matuschek, Hannes
A1  - Kliegl, Reinhold
A1  - Vasishth, Shravan
A1  - Baayen, Harald R.
A1  - Bates, Douglas
T1  - Balancing Type I error and power in linear mixed models
JF  - Journal of memory and language
N2  - Linear mixed-effects models have increasingly replaced mixed-model analyses of variance for statistical inference in factorial psycholinguistic experiments. Although LMMs have many advantages over ANOVA, like ANOVAs, setting them up for data analysis also requires some care. One simple option, when numerically possible, is to fit the full variance covariance structure of random effects (the maximal model; Barr, Levy, Scheepers & Tily, 2013), presumably to keep Type I error down to the nominal a in the presence of random effects. Although it is true that fitting a model with only random intercepts may lead to higher Type I error, fitting a maximal model also has a cost: it can lead to a significant loss of power. We demonstrate this with simulations and suggest that for typical psychological and psycholinguistic data, higher power is achieved without inflating Type I error rate if a model selection criterion is used to select a random effect structure that is supported by the data. (C) 2017 The Authors. Published by Elsevier Inc.
KW  - Power
KW  - Linear mixed effect model
KW  - Hypothesis testing
Y1  - 2017
U6  - https://doi.org/10.1016/j.jml.2017.01.001
SN  - 0749-596X
SN  - 1096-0821
VL  - 94
SP  - 305
EP  - 315
PB  - Elsevier
CY  - San Diego
ER  - 
TY  - JOUR
A1  - Baayen, Harald R.
A1  - Vasishth, Shravan
A1  - Kliegl, Reinhold
A1  - Bates, Douglas
T1  - The cave of shadows: Addressing the human factor with generalized additive mixed models
JF  - Journal of memory and language
KW  - Generalized additive mixed models
KW  - Within-experiment adaptation
KW  - Autocorrelation
KW  - Experimental time series
KW  - Confirmatory versus exploratory data analysis
KW  - Model selection
Y1  - 2017
U6  - https://doi.org/10.1016/j.jml.2016.11.006
SN  - 0749-596X
SN  - 1096-0821
VL  - 94
SP  - 206
EP  - 234
PB  - Elsevier
CY  - San Diego
ER  -