QMS 102 Lecture Notes - Vilfredo Pareto, Pareto Chart, Pie Chart

• School: Ryerson University
• Department: Quantitative Methods
• Course: QMS 102
• Professor: Sheila Rosenberg

Document Summary

We cannot perform calculations of qualitative (nominal or ordinal) data, but . You can perform calculations on the number of responses in each category. To graphically present qualitative data we use: bar charts (horizontal or vertical, pie charts, pareto charts (look like bar charts, but with an additional piece of information) See example 2. 2, 2. 3 & 2. 4 on pg. In a bar chart, a bar shows each category, the length represents the amount, frequency or percentage of values falling into a category which come from the summary table of the variable. A pie chart is a circle broken into segments that represent categories. The size of each slice of the pie varies according to the percentage in each category. Named after the 19th century italian economist vilfredo pareto whose research discovered that. 80% of the wealth is owned by 20% of the population: generalized as the 80/20 rule.