Quantitative Measurement Flashcards
What is discrete data?
Describes the presence or absence of some characteristic or attribute
How can discrete data be gathered?
Nominal Scales!
What is a Nominal Scale?
A scale that classifies a variable into qualitatively different categories
Allows for classification of data (male or female)
Doesn’t allow for ordering (male greater than female)
A qualitative difference not quantitative
Nominal=name
How can a nominal scale be named by?
Words
How many categories does a nominal scale need to have?
At least two
What are the requirements of a nominal scale?
Must be mutually exclusive (box for person)
Must be equivalent (same range 5-10 11-20
Must be exhaustive (nothing in the scale is missing)
What is continuous level data?
Describes values and how they can differ in degree, amount or frequency, and how these differences can be ordered on a continuum. (Ordinal and Interval)
What is an ordinal scale?
An Ordinal scale not only classifies the variables into nominal categories, but also rank orders those categories along some dimension.
What is the order for an ordinal scale?
Logical order, but not necessarily meaningful differences between ranks/categories. (1st, 2nd, 3rd choices)
What is an example of an ordinal scale?
Rate your pain on a scale of one to ten with 10 being the worst pain you have ever felt…you can’t rank someone’s pain against another. the scale is different for everyone
What is an interval scale?
Establishes equal difference between adjacent points along the measurement scale.
An ordered, constant scale (1-2 is the same as 3-4)
Does an interval scale have meaningful scale points?
Yes the distance between points i s assured to be equal.
What are the two types of interval scales?
Likert Scales
Semantic Differential Scales
What is the difference between the likert and semantic scale?
The Likert Scale has numerical descriptors
What are the three reliability checks?
Coder Reliability
Test-Retest Reliability
Split-Half Reliability
