Statistical Sciences 2244A/B Chapter Notes - Chapter 1-2: Exploratory Data Analysis, Unimodality, Box Plot
15 Jan 2017
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Document Summary
Individuals are objects described by a set of data. Nominal (unordered) vs ordinal (can be ranked - but intervals between ranks are usually not identical, not quantitative) Quantitative: numerical value (usually recorded in a unit of measurement) Interval (20 is 5 more than 15) vs ratio (20 is twice as big as 10) Continous (any real number) vs discrete (limited to a set of finite values) What values it takes and how often. For a categorical variable, how many individual in each category is recorded. More flexible, can compare any set of categories. Good at pointing out order and importance. A graphical distribution of a single quantitative variable. Usually groups values together if there are more than a few data points. Must include all the categories that make up a whole. Can"t use of the categories are not the same size. Used to emphasize a category"s size relative to the whole. Sensitive to changes in small portion of the population.
