This repository stores the preregistration and supplementary material of the article titled "Assessing the Internal Consistency Reliability of Ecological Momentary Assessment Measures: Insights from the WARN-D Study." The repository is organized as follows and contains the following files and folders: - **DataID**: Folder that contains two `csv` files with the IDs and language of the participants included for the analyses of the EMA ($N=1167$) and weekly ($N=1127$) scales. All the participants considered for the analyses of the weekly measures were also considered for the analyses of the EMA measures. - **Lavaaan**: Three lavaan models as `txt` files, which were used to estimate person-specific reliability of PA and NA according to the PFA model. - **Mplus**: Input files for estimating the 2RDM and ME-TSO models in Mplus. This also includes models that did not converged such as the 2RDM model for NA and the English subsample and bidimensional 2RDM models that aimed to analyze PA and NA simultaneously per subsample. - **R**: Custom functions used for the analyses reported in this project. The goal of these functions was to easily read Mplus output into R and to compute the reliabilities based on the 2RDM and the ME-TSO. - *data_preprocessing.R*: Script to clean and separate the EMA and weekly data before performing the statistical analyses for this project. - *warn-d_rel_supp.pdf*: Supplementary material with a detailed description of the analyses and results, including the associated R code. - *Warn_D_Reliability_preregistration.pdf*: Preregistration of the statistical analyses performed for this project.