PSYCH 240 Lecture Notes - Lecture 3: Unimodality, Multimodal Distribution, Bar Chart
28 Sep 2016
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Document Summary
Distribution: a description of the values that the variable has, and the frequency with which it has each of the values. Frequency - the number of times each value occurred is on the y-axis. Joint distribution - tells us how many individuals have each combination of values. A histogram is the most common type of graph. With bins, there is no right answer for bin sizes we just want bins that allow us to see the shape of the distribution. Skewed right - long tail is on the right. Skewed left - long tail is on the left. A value that is far away from the other values in the distribution. Just because it"s an outlier doesn"t mean it"s wrong (although sometimes it is) Half the observations are smaller and the other half are larger. The less symmetrical a distribution is, the more the mean and median will differ.
