Other variable.functions: age,
animal, answer,
area, car,
children, coin,
color, date_stamp,
death, 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, year,
zip_code