STAT 263 Lecture Notes - Lecture 1: Confounding, Level Of Measurement, Categorical Variable
6 May 2017
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Document Summary
Lurking variable (confounding variable): variable that has an important effect on the relationship among the variables in a study, but is not included. In a study of the correlation between exercise and brain function a lurking variable may be eating habits, genetics, or stress of those studied. Population: a set of data consisting of all possible (or hypothetically possible) observations of a given phenomenon. Inferential statistics (if sample looks like what can we say about the population?) Descriptive statistics: the use of numerical and graphical methods to summarize the information revealed in the data, and present it in a convenient form. Inferential statistics: involves making estimates, decisions, predications and other generalizations about a population based on the study of a subset of the population. Nominal data: a type of categorical data that gives a name or a number to individual or mutually exclusive categories. A, b, and c are mutually exclusive if only one is valid at one time.
