Question

Which of these variables are ordinal variables?
Age
Gender
Reported calcium level (mmol/L) for each patient
Reported phosphorus level (mmol/L) for each patient
Reported alkaline phosphatase level (IU/L) for each patient
Six laboratories (coded as 1 to 6 in the dataset).
One to five age groups (65-69, 70- 74, 75-79, 80-84, 85-89)

Answer 1

One to five age groups is the only ordinal variable.

Age- it is a continuous variable

Gender- it is a categorical variable but not ordinal

Reported calcium level- Continuous variable

Reported alkaline phosphate level - Continuous variable

Six laboratories - Categorical variable, but not ordinal. It is a nominal variable.