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Construct
 the thing that's being measured;
 can be abstract
 or tangible

Indicator
 a construct that gives information about another construct
 used when researchers can't get to a construct directly
 eg; skin response to indicate nervousness

Operationalization
Indicators that give us access to to some aspect of the realworld manifestation of their respective constructs

Artifacts
Other unwanted factors that impact on a result

Valid
an indicator that is not contaminated by artifact or error

Reliable
an indicator that produces the same result every time

Variable
 an operationalization of a construct that can change
 there are no universal variables
 can be btwn people or over time

Discrete variables
 variables can only take certain values and no others
 accurately measurable in principle
 eg categorical or numerical

Continuous
 variables which theoretically could take any value over their
 range
 only ever measured aproximately

Nominal measurement
a variable has categories or states that differ in kind but not in any order or degree

Ordinal measurement
a variable has categories or ranks that are ordered but whose differences are not quantifiable

Interval measurement
 a variable has values on a scale whose differences are quantifiable but which lacks a true zero point
 therefore cannot make comparisons because you need a true zero point

Ratio measurement
 A variable has a scale with quantifiable differences and a true zero
 is therefore comparable