Research library.
Choose a concept. Read the definition, explore an example and test your understanding.
48 concepts
Survey design2 min read
Closed-ended question
Collect answers from predefined choices.
Beginner
Survey design2 min read
Double-barrelled question
Ask for one answer to two separate judgments.
Beginner
Survey design2 min read
Questionnaire pretesting
Check how questions work before launch.
Beginner
Qualitative research2 min read
Focus group
Explore experiences through group interaction.
Beginner
Qualitative research2 min read
Qualitative coding
Mark meaningful features of data with concise labels.
Beginner
Statistics2 min read
Standard deviation
Summarize spread around the mean.
Beginner
Statistics2 min read
Outlier
An observation far from the overall pattern.
Beginner
Statistics2 min read
p-value
Assess incompatibility with a null hypothesis.
Intermediate
Statistics2 min read
Type I error
Reject a null hypothesis that is actually true.
Intermediate
Research design2 min read
Cross-sectional study
Examine a population during a defined period.
Beginner
Research design2 min read
Longitudinal study
Track change through repeated measurements.
Beginner
Research design2 min read
Random assignment
Use chance to allocate experimental conditions.
Beginner