GEOG 3222 Lecture Notes - Lecture 2: Weighted Arithmetic Mean, Modifiable Areal Unit Problem, Descriptive Statistics
26 Feb 2017
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Document Summary
Mode: value that occurs most frequently in a set of ungrouped data. Limitations: not appropriate in a large data sets with few or no tied observations. Modal class: category with the largest number of observations. Median: middle value from a set of ranked observations. Odd number data set vs. even number data set. Median is not effected by extreme outliers. Mean: sum of a set of values divided by the number of observations in the set. Range: difference between largest and smallest values in a data set. Interquartile range: the difference between the 25 value (the middle half of the data set) Boxplot: (or box and whiskers plot) graphic extension of the interquartile range percentile value and the 75 th th percentile. Standard deviation: a quantity calculated to indicate the extent of deviation for a group as a whole. Coefficient of variation: a standardized measure of dispersion of a probability distribution or frequency distribution.
