Exploring Data Individuals and Variables Categorical and Quantitative Variables.

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Presentation transcript:

Exploring Data Individuals and Variables Categorical and Quantitative Variables

Variable vs Individual Fitness First Gym Database NameHeightWeightGenderOccupation Mario75’210lbsMPilot Lucy51’145lbsFChef Paul64’198lbsMArmy Mary73’237lbsFFamer Cory67’215lbsMreader Individual: are the objects being described by a set of data. They can be people, but they may also be animals or things Variables: are any characteristic of an individual. A variable can take different values for the different individuals.

Categorical VS. Quantitative Categorical: places an individual into one of several groups. Quantitative: takes numerical values for which arithmetic operations make sense Fitness First Gym Database NameHeightWeightGender Occupatio n Mario75’210lbsMPilot Lucy51’145lbsFChef Paul64’198lbsMArmy Mary73’237lbsFFamer Cory67’215lbsMreader

What do you need to ask yourself when you see a set of data? WHO: WHAT: WHY: What individuals do the data describe? How many individuals appear in the data? How many variables are there? What are the exact definition of the variables? What is the reason the data were gathered?