Researchers cannot observe
* All people’s behavior
Researchers can observe
Goal of sampling
Use data from a sample to represent the population
* Sample must be similar to population
External Validity
*Extent to which a study’s findings may be used to describe people, settings, conditions beyond those used in the study.
Sampling Behavior
Two Methods of Sampling Behavior
* Situation sampling
Goal of Sampling Behavior
Obtain representative sample of behavior
Time Sampling
Situation Sampling
Naturalistic Observation
Goals of Naturalistic Observation
Direct Observation with Intervention
*Characterizes most psychological research
Gain control over observations
Three Methods in Natural Settings
Problem of Reactivity
Indirect (Unobstrusive) Observational Methods
- Nonreactive
Indirect (Unobtrusive) Observational Methods: Two types of methods
Possible problems in archival records
Unobtrusive Measures
Seek converging evidence using multimethod approach.
Recording Behavior
Nominal Measurement Scale
Categorize behaviors, events
*Sort stimuli into discrete categories
Ordinal Measurement Scale
Rank-order
*Rank-order stimuli on a single dimension
Interval Measurement Scale
Ratio Measurement Scale
Specify distance plus meaningful zero
*Specify the distance between stimuli on a given dimension and express ratios of scale values