PSYC 3000 Midterm: Cheat Sheet (Midterm #1)
13 Jan 2016
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Document Summary
Show all the data in a dataset sequentially. Reveals unusual relationships between variables rather than unusual values. Histograms: do not show all data, only processed data. Boxplots: the upper quartile is the upper hinge and q3. The lower quartile is the lower hinge and q1. **note that fences are not necessarily marked by the end of the wiskers** Dots are outliers while * is an extreme outlier. About 99% of all data lies between the fences. The width of the box indicates dispersion while the placement of q1,2, and 3 indicates the symmetry. However, you can never asume the shape of a distribution based on the shape of a boxplot. Mathematically easy to use but is strongly affected by extreme scores. Resistant to extreme scores but not easy to use for analyses. Useful for even categorical data but is strongly affected by sampling fluctuations. Easy to use for analyses but affected by extreme scores.
