RelativeResourceManager-5

RelativeResourceManager-5 - Graphing PSY 2801 Summer 2010...

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Unformatted text preview: Graphing PSY 2801: Summer 2010 Graphing Jeff Jones University of Minnesota Jeff Jones Lecture 2 Graphing CH 3 Why Plot? Our eyes don’t see patterns in a lot of random numbers So, to make sense of a lot of data, the best thing to do is to first visualize it in some way Jeff Jones Lecture 2 Graphing CH 3 Why Plot? Our eyes don’t see patterns in a lot of random numbers So, to make sense of a lot of data, the best thing to do is to first visualize it in some way This is never ending advice → always (always ) plot first Even when you’re doing advanced statistics, if you can plot -- it will help make sure you are choosing the correct procedure Jeff Jones Lecture 2 Notes Notes Notes Graphing CH 3 Bar Graph Suppose we have a discrete measure (nominal or ordinal), and we want to display the “amount of stuff” that belongs to each class of the discrete measure Our Discreet Measure: Country Our “Amount of Stuff”: % of people who do blah 1 USA: 32.2% 2 England: 45.5% 3 Canada: 22.2% 4 France: .1% How would we graph this? Jeff Jones Lecture 2 Graphing CH 3 Bar Graph USA England Canada France Country % of people who do blah 10 20 30 40 50 The best graphing technique would be one for discrete data Thus we could use a bar graph, a line graph, or a pie chart For nominal variables, a line graph is deceiving (why?) Jeff Jones Lecture 2 Graphing CH 3 ● ● ● ● 10 20 30 40 50 Country % of people who do blah USA England Canada France Line graphs give the illusion that there is a trend. There is not a trend for two reasons: (1) we are plotting only one variable, and (2) there is not a set order to the bars. England could come after France, and we would not lose any information Jeff Jones Lecture 2 Notes Notes Notes Graphing CH 3 Bar Graph USA England Canada France Country % of people who do blah 10 20 30 40 50 You should notice several things about a bar graph: 1 Bars are separated from one another 2 Appropriate labeling on the side of the graph 3 Appropriate labeling of the bars 4 Make sure the graph is clear!!!graph is clear!...
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RelativeResourceManager-5 - Graphing PSY 2801 Summer 2010...

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