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.
Brand vs. Generic. Dextroamphetamine is a generic drug that is sometimes used in combination with other substances to treat ADHD, narcolepsy, and other medical conditions. Its brand names include ProCentra and Dexedrine (NLM). Adderall is a brand name drug that contains both dextroamphetamine and amphetamine.It is used to treat the same types of conditions, as both drugs cause alertness, increased energy, and more focused concentration. Because Adderall is a brand name drug, it often has more name recognition with users.rand vs. Generic. Dextroamphetamine is a generic drug that is sometimes used in combination with other substances to treat ADHD, narcolepsy, and other medical conditions. Its brand names include ProCentra and Dexedrine (NLM). Adderall is a brand name drug that contains both dextroamphetamine and amphetamine.