Categorical variables are also known as qualitative (or discrete) variables. These categorical variables can be further classified as being nominal, dichotomous or ordinal variables. Each of these types of categorical variable (i.e., nominal, dichotomous and ordinal) has what are known as categories or levels. These categories or levels are the descriptions that you give a variable that help to explain how variables should be measured, manipulated and/or controlled.
BetimolÂ® (timolol ophthalmic solution), 0.25% and 0.5%, is a non-selective beta-adrenergic antagonist for ophthalmic use. The chemical name of the active ingredient is (S)-1-[(1,1-dimethylethyl)amino]-3-[(4-(4-morpholinyl)-1,2,5-thiadiazol-3-yl]oxy]-2-propanol. Timolol hemihydrate is the levo isomer.
GENERIC NAME: glipizide. BRAND NAME: Glipizide XL, Glucotrol, Glucotrol XL. DRUG CLASS AND MECHANISM: Glipizide is an oral drug that is used for treating patients with type 2 diabetes. It belongs to the sulfonylurea class of drugs which also includes glimepiride (Amaryl), glyburide (Diabeta, Glynase), tolbutamide and tolazamide.