STATS: SCALE OF MEASUREMENT

	Nominal	Ordinal	Interval	Ratio
Type of data	Qualitative	Qualitative	Quantitative	Quantitative
Attribute	Names the attributes	Ranks the attributes	Ranks the attributes	Ranks the attributes
Absolute zero	meaningless	meaningless	meaningless	meaningful
Multiples	-	-	meaningless	meaningful
Frequency	Yes of categories	Yes of categories	Yes of  intervals /bins / class intervals	Yes of intervals / bins / class intervals
Percentage	Categories	Categories	Classes or intervals	Classes or intervals
Mode	Yes	Yes	Yes	Yes
Median	No	No	Yes	Yes
Mean	No	No	Yes	Yes
Graphical displays	Pie chart Bar chart	Pie charts Bar charts	Stem-and-leaf Cross tabulation	Histograms Scatter plots
Examples	Brands of toothpaste (Aquafresh, Colgate, Close up, Mcleans, Mentadent P, Sensodyne)	Size (XS, S, L, XL, XXL)	Temperature (Celsius - , Fahrenheit - )	Distance or weight – usually have some sort of measurement scale