Statistical Sciences 1024A/B Lecture Notes - Lecture 9: Cadency, Dependent And Independent Variables
16 May 2016
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Chapter 9: observational study: observes individual, measures variable. Purpose is to describe some group or situation: experiment: deliberately imposes some treatment on individuals in order to observe their responses. Purpose is to study whether the treatment causes a chance in response: methodology in experiments: Divide experimental units into groups (corresponding to the number of treatments to be tested) Measure the units to see if there are any differenced in the treatments: treatments: made up of one or more factors, factors: explanatory variables in the sample (dependent variables) Factors/treatments are explanatory variables and the measured response to the treatments is the response variable. Example: if the experiment involves giving two different doses of a drug, we say that we are testing two levels of the factor: comparative experiments: experimental units treatments measurement of a response. Experimental units are similar to one another. Experimental units are divided at random into several groups corresponding to the number of factors and levels.
