Other variable.functions: age,
animal, answer,
area, car,
children, coin,
color, date_stamp,
death, dice,
dna, dob,
dummy, education,
employment, eye,
grade_level, grade,
group, hair,
height, income,
internet_browser, iq,
language, level,
likert, lorem_ipsum,
marital, military,
month, name,
normal, political,
race, religion,
sat, sentence,
sex_inclusive, sex,
smokes, speed,
state, string,
upper, valid,
zip_code