Author Archives: Matthew Nagie
Confidence interval for two independent means
A confidence interval for two independent means is a method of statistical inference to determine if there is a difference between the mean values of two populations, or what the value of the difference may be. Since it compares two populations, there must be a (binary) categorical variable involved in the global population by which to […]
Coefficient of Determination
The coefficient of determination, denoted as R2, is a measure of strength of a given correlation. The value will fall between 0 and 1, with a larger number representing a stronger correlation. There are three ways to calculate the coefficient of determination, though each is not guaranteed to produce the same value. In the scope of […]
Clustered Bar Graphs
A clustered bar graph, also called a grouped bar graph, is visually very similar to a “regular” bar graph, with one important difference in the data being presented: a second categorical variable is used to further break down the existing categories, thus aiding in the representation of data. A simple example of a clustered bar […]
Intro to Statistical Methods 
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