Variables

1. Types of Variables

1.1. Numerical

1.1.1. Continuous

1.1.2. Discrete

1.2. Categorical

1.2.1. Ordinal

1.2.2. Nominal

1.2.3. Dichotomous

1.2.4. Polychotomous

1.3. Experimental

1.3.1. Independent

1.3.2. Dependent

1.3.3. Controlled

1.3.4. Confounding

1.3.5. Intervening

1.4. Non-Experimental

1.4.1. Predictor

1.4.2. Criterion

2. Nature of Variables

2.1. Ratio

2.2. Interval

2.3. Nominal

2.4. Ordinal