Are your covariates under control? How normalization can re-introduce covariate effects

Genome-Wide Association Analyses in 128,266 Individuals Identifies New Morningness and Sleep Duration Loci

(2016) Samuel E. Jones et al.   PLoS Genetics

Genetic studies of body mass index yield new insights for obesity biology

(2015) Adam E. Locke et al.   NATURE

Novel insights into the genetics of smoking behaviour, lung function, and chronic obstructive pulmonary disease (UK BiLEVE): a genetic association study in UK Biobank

(2015) Louise V Wain et al.   Lancet Respiratory Medicine

Characterization of Psychotic Experiences in Adolescence Using the Specific Psychotic Experiences Questionnaire: Findings From a Study of 5000 16-Year-Old Twins

(2013) Angelica Ronald et al.   SCHIZOPHRENIA BULLETIN

Twins Early Development Study (TEDS): A Genetically Sensitive Investigation of Cognitive and Behavioral Development From Childhood to Young Adulthood

(2012) Claire M. A. Haworth et al.   Twin Research and Human Genetics

Rank-Based Inverse Normal Transformations are Increasingly Used, But are They Merited?

(2009) T. Mark Beasley et al.   BEHAVIOR GENETICS