R variable aliases for commonly used vector and values.
dlm_ll
dlm_grades
dlm_complexityAn object of class character of length 7.
An object of class character of length 16.
An object of class character of length 4.
dlm_ll contains all linkage level names for ELA, mathematics, and science.
dlm_grades contains all DLM grade levels.
dlm_complexity contains all complexity band names for ELA, mathematics,
science, writing, and communication.