STAT 2510 Lecture Notes - Lecture 3: Frequency Distribution, Histogram
22 Jan 2017
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For quantitative you will need frequency or relative frequency distribution. Observations (1 individual measurement) grouped into classes or categories. *rule of thumb-5-20 class; no more than 20. Classes are treated as distinct values for constructing frequency and relative frequency distribution. Each observation has to belong to exactly one class each (no overlap) All classes need to be the same in width. Single value very few outcomes; discrete data and small number of distinct values. Limit grouping whole numbers; too many distinct values for single value grouping. Cutpoint grouping continuous data, usually expressed with decimals. Class width lower limit of lower and upper classes. *stem and leaf plot is the same shape as histogram if it was flipped sideways. Distribution of a data set values of observation and how often they occur. *to identify shape, a smooth curve is drawn to approximate the overall shape.
