01:830:200 Lecture Notes - Lecture 1: Random Assignment, Sample (Statistics), Voting Age
9 Oct 2018
School
Department
Course
Professor
Document Summary
Reliability - the results should be consistent with subject of measure. Is necessary to ensure validity, but alone is not a guarantee of validity. Nominal (categorical) : discrete, mutually exclusive categories (can be in only one) Allows for counts/percentages only ( how many males/females are there? ) Variable is only a label, so greater/less than do not apply, and no math operations apply ( male can"t be greater than female, etc. ) Ordinal : elements can be arranged in a hierarchical sequence (rank order) Indicates relative position so greater/less than do apply, but intervals between positions are unknown ( can"t figure out how much 1st place beat. Interval/ratio (scale/continuous variables) : values represent true quantities. Intervals between each value are equal, so all math operations can be carried out (constant) Ratio values have true 0 value - represents the absence of the property ( ex.
