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Is birthday a categorical variable?
No, date of birth is an ordinal variable. Ordinal variables are similar to categorical variables except that an ordering of the values is possible. With date of birth there are obviously many possible day/month/year "categories" but they are discrete and can clearly be ordered from highest to lowest or vice versa.A categorical variable might be something like animal type. Each animal type fits into a class, but there's no intrinsic ordering of cow, sheep, pig for example.Date of birth itself is not an interval variable either. It doesn't make a lot of sense to talk about "average date of birth" for example. But of course, date of birth can be convertedto an interval variable (i.e. age) simply by subtracting it from another date (e.g. today's date).
Why does adding birth year to age in current year equal current year?
Sometime in the next calendar year after your birth year, you will have your first birthday. Birth year + 1 = the next year Birth year + 2 = the year after that This pattern will remain for the rest of your life. The year of your 20th birthday will be 20 years after your birth. Repeat, as necessary, until one of the years is the current one.
What is your year of birth?
the year you were born in
How old would Jesus Christ have been today 25 December 2009?
The exact date and year of his birth is not known.The exact date and year of his birth is not known.The exact date and year of his birth is not known.The exact date and year of his birth is not known.
What is the year of birth of an 85-year-old?
1925
