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Unformatted text preview: • Last day, looked at a variety of plots • For categorical variables, most useful plots were bar charts and pie charts • Looked at time plots for quantitative variables • Key thing is to be able to quickly make a point using graphical techniques • Recall: – A distribution of a variable tells us what values it takes on and how often it takes these values. • Similar to a bar chart, would like to display main features of an empirical distribution (or data set) • Histogram – Essentially a bar chart of values of data – Usually grouped to reduce “jitteriness” of picture – Groups are sometimes called “bins” • Uses rectangles to show number (or percentage) of values in intervals • Yaxis usually displays counts or percentages • XAxis usually shows intervals • Rectangles are all the same width • In a study of productivity, a large number of authors were classified according to the number of articles they published during a particular period of time. • Experiment was conducted to investigate the muzzle velocity of a antipersonnel weapon (King, 1992) • Sample of size 16 was taken and the muzzle velocity (MPH) recorded • Find minimum and maximum values of the data • Divide range of data into nonoverlapping intervals of equal length • Count number of observations in each interval...
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This note was uploaded on 03/10/2011 for the course STAT 100 taught by Professor D during the Spring '11 term at Simon Fraser.
 Spring '11
 D

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