Variables and data Flashcards
1
Q
Nominal data
A
- named categories
- if just two categories then this is binary data
2
Q
Ordinal data
A
- a set of ordered categories
- e.g answers to an item on questionnaire
3
Q
Discrete data
A
-values are whole numbers
4
Q
Continuous data
A
-values of the measurements can take any number in a range
5
Q
Interval data
A
-measurements where the difference between two values is meaningful e.g degree celsius
6
Q
Ratio data
A
-has a clear definition of a zero point so ratios are meaningful such as height and weight- weight can be halved
7
Q
Independent variable
A
- controlled by the experimenter, presumed to have a causal/antecedent effect on dependent variable
- more than one independent variable can affect a single dependent variable
8
Q
Dependent variable
A
- depends on the value of independent variable
- e.g smoking is independent variable, cancer is the dependent variable
9
Q
Mediator variable
A
- mediates the effects of A in causing B- C is the mediator variable
- statistical mediation
- if there is a partial mediator then when this is absent it reduces but does not eliminate the effect of A on B
- C cannot cause B
- analysed using regression tests
10
Q
Non-parametric tests
A
-nominal and ordinal data are analysed using nonparametric tests
11
Q
Parametric tests
A
-most measured variables are analysed using parametric tests
