Measurement: scales of measurement

What are the three ways to measure variables?

Self-report, observational, and physiological

What does it mean that measures should have converging evidence?

You should get the same pattern of results with these different kinds of measures

What are three things that you should consider when deciding what scale of measurement was used?

Magnitude, equal intervals, and true zero

What are the four scales of measurement?

C.O.I.R. Categorical, ordinal, interval, and ratio

What are two reasons why it is important to know what kind of scale was used?

Scales determine the kind of states used to analyze data and different scales give you different kinds of info

Pros of self-report

Easy to administer

Con of self-report

Social desirability and word effects

Pros of observational

Good face validity

Cons of observational

Reactivity

Pros of physiological

Measure things that cannot be directly observed

Cons of physiological

Invasive and expensive