A meta-analysis [ 19] examined personality correlates of marijuana use categorizing traits into "negative affect" (e.g., depression, anxiety), "emotionality" (e.g., extraversion, social disinhibition), and "unconventionality" (e.g., tolerance of deviance, non-religiosity).
Following Mousseau and Roff (1987), we then categorized each trait into one of the following trait classes: (i) behavior, (ii) life history, (iii) morphological, and (iv) physiological.
On the basis of the measurement method used to operationalize them, EI constructs can be categorized into trait EI (emotion-related self-perceived abilities and behavioral tendencies measured through self-report tests) and ability EI (emotion-related cognitive abilities that should be assessed via maximum-performance tests) [ 8].
However, many phenotype measures are intrinsically quantitative and categorizing continuous traits may not always be straightforward and meaningful.
Traits in Gramene are identified by the Trait Ontology [ 43] and are categorized according to trait categories, which are assigned by agronomic importance (anatomy, abiotic stress, biochemical, biotic stress, development, quality, sterility or fertility, vigor, yield).
Like living species, extinct species are categorized according to traits that they share in exclusion to other groups of species.
Due to the difficulties of imputing these "99x" codes into exact ages, these two variables were categorized into binary traits.
An analysis tool based on these characteristics might help researchers see and compare the genomic positions of QTLs categorized into different trait categories and inform them of QTL clusters or co-localized regions on the rice genome map.
These QTL are categorized into nine trait categories (TCs) encompassing 237 characters as subordinate categories.
