Scales of Measurement →
Measurement →
→
→
Scale →
Continuous Scale
Ratio Scale
→
Discontinuous Scale
→
Discontinuous Continuous
Nominal Ordinal Interval Ratio
Error
Categorizes & labels variables ✓ ✓ ✓ ✓
Ranks categories in order ✓ ✓ ✓
Has equal intervals/differences ✓ ✓
Has a true or meaningful zero ✓
FOUR LEVELS OF MEASUREMENT
Describing Data
Nominal Scales
Distribution
→ Categorical Scale/Variable
→ Raw Scores
→ Standardized Scores
Ordinal Scales
FREQUENCY DISTRIBUTION
→
Frequency Distribution
→
Simple/Ungrouped FQ
→
Grouped FQ
→
Interval Scales
, Upper Limits MEASURES OF VARIABLITY
Lower Limits
Measure of Variability
Graph
→
Histogram
→
Abscissa (X-axis)
Ordinate (Y-axis)
Bar Graph Range
→ outlier
→
→
→
Frequency Polygon
Interquartile & Semi-quartile Ranges
MEASURES OF CENTRAL TENDENCY → Quartile
Measures of Central Tendency
→ Quarters
Mean
→ median/midpoint
→ quarter-points.
Median
→
→
Mode
→
Interquartile Range
→
Semi-interquartile Range
→
Measurement →
→
→
Scale →
Continuous Scale
Ratio Scale
→
Discontinuous Scale
→
Discontinuous Continuous
Nominal Ordinal Interval Ratio
Error
Categorizes & labels variables ✓ ✓ ✓ ✓
Ranks categories in order ✓ ✓ ✓
Has equal intervals/differences ✓ ✓
Has a true or meaningful zero ✓
FOUR LEVELS OF MEASUREMENT
Describing Data
Nominal Scales
Distribution
→ Categorical Scale/Variable
→ Raw Scores
→ Standardized Scores
Ordinal Scales
FREQUENCY DISTRIBUTION
→
Frequency Distribution
→
Simple/Ungrouped FQ
→
Grouped FQ
→
Interval Scales
, Upper Limits MEASURES OF VARIABLITY
Lower Limits
Measure of Variability
Graph
→
Histogram
→
Abscissa (X-axis)
Ordinate (Y-axis)
Bar Graph Range
→ outlier
→
→
→
Frequency Polygon
Interquartile & Semi-quartile Ranges
MEASURES OF CENTRAL TENDENCY → Quartile
Measures of Central Tendency
→ Quarters
Mean
→ median/midpoint
→ quarter-points.
Median
→
→
Mode
→
Interquartile Range
→
Semi-interquartile Range
→
