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Levels of Measurement
Errors in Validity
Measures
100
The level of measurement that measures categories.
Nomial
100
This can cause an error in validity.
The measure does not capture the essential features of the concept.
100
The various types of measures.

Standardized

Observational

Individual Rating Scales

Client Logs

200
In this level of measurement, the distance between numbers has meaning.
Interval
200
This can happen to effect the validity of a measure.
When it measures something other than the concept it was supposed to measure.
200
Characteristics of good measures.

Reliable

Valid

Sensitive to change

Non-reactive

Direct

Easy to use

Accessible

Relevant to intervention planning

300
In this level of measurement, the attribute can be categorized in a certain order.
Ordinal