STAT 2507 Lecture Notes - Lecture 2: Univariate, Statistical Unit, Unimodality
15 Sep 2015
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Stat 2507 chapter 1 lecture: describing data with graphs. Variable: characteristic that changes or varies over time &/or for diff individuals or objects under consideration. Examples: hair colour, white blood cell count, time to failure of computer component. Experimental unit: individual or object on which variable measured. Measurement: results when variable actually measured on experimental unit: set of measurements, called data, can be either sample or population. Population: set of all measurements of interest to investigator. Sample: subset of measurements selected from population of interest. Variable: hair colour: experimental unit: person, typical measurements: brown, black, blonde, etc. Variable: time until light bulb burns out: experimental unit: light bulb, typical measurements: 1500 hrs, 1535. 5 hrs, etc. Univariate data: 1 variable measured on single experimental unit. Bivariate data: 2 variables measured on single experimental unit. Multivariate data: more than 2 variables measured on single experimental unit. Data -> quantitative -> discrete or continuous. Measure quality or characteristic on each experimental unit: examples:
