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</o:shapelayout></xml><![endif]--></head><body lang=DE link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-family:"Times New Roman",serif'>Dear all,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'>I am currently working on a three-level meta-regression and I am a bit unsure about how to properly/adequately report heterogeneity in such mixed-effect models (whereas it is pretty clear cut for regular „two-level“ meta-regressions e.g. the recent best practice recommendations of Gonzalez-Mule & Aguinis 2017 (<a href="http://journals.sagepub.com/doi/abs/10.1177/0149206317710723">http://journals.sagepub.com/doi/abs/10.1177/0149206317710723</a>)<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'>Currently the metafor rma.mv function provides us with variance estimates for both levels and a Q-test on residual heterogeneity. Moreover, we are provided with code on how to calculate I2 in multilevel models, which I did (<a href="http://www.metafor-project.org/doku.php/tips:i2_multilevel_multivariate#multilevel_models">http://www.metafor-project.org/doku.php/tips:i2_multilevel_multivariate#multilevel_models</a>).<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'>Turning towards the metaSEM package of Cheung, he reports variance estimates (no predictors vs. predictors) for both levels and R2 (<a href="https://courses.nus.edu.sg/course/psycwlm/internet/metasem/3level.html#model-1-type-as-a-covariate">https://courses.nus.edu.sg/course/psycwlm/internet/metasem/3level.html#model-1-type-as-a-covariate</a>). However, not I2. In his book (Cheung 2015) reports, on page 186, some formulas on how to calculate I2 and ICC in three-level models but ends with a cautionary note that we lack further insight in order to make reliable statements on that matter.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'>Hence, I am a bit left in the dark in terms of what is currently appropriate (or how to defend such choices) and would like to pick your brains on that issue.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'>Best regards<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Times New Roman",serif'>Jens<o:p></o:p></span></p></div></body></html>