Dustin K MacDonald

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Category: Math and Statistics

Statistical Coding and Classification

Posted on July 11, 2016November 25, 2018 by Dustin

Introduction to Classification Oftentimes when performing research or intelligence analysis, the first step is to classify the available data. Classification provides a number of benefits that make later analysis easier. For one, they allow you to infer other qualities based on all items in a class sharing similar properties. For instance, knowing that mammals have…

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Predicting Your Helpline Call Answer Rate

Posted on January 29, 2015November 25, 2018 by Dustin

One role of helpline managers is to manage their workers so that they can answer the most calls possible within the available resources. Even helplines that run 24-hours and have 100% coverage can’t answer 100% of the calls that come in if they have more callers calling in than workers available. Using a system like Chronicall…

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Least-Squares Regression

Posted on January 26, 2015November 25, 2018 by Dustin

Regression is a technique used to predict future values based on known values. For instance, linear regression allows us to predict what an unknown Y value will be, given a series of known X and Y’s, and a given X value. Given the following, it’s easy to see the pattern. But assuming no obvious pattern…

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Correlation (Calculating Pearson’s r)

Posted on January 25, 2015December 20, 2018 by Dustin

Correlation refers to the idea that two variables (x and y) impact each other. For instance, the grades in a statistics class may be related to, or correlated with the amount of time those students study. As study time goes up, grades go up. This would be a positive correlation. On the other hand, as…

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Z-Scores

Posted on January 24, 2015November 25, 2018 by Dustin

Z Scores were a concept I had trouble with in University. It’s actually not as difficult as they’re made out to be. I’ll spare you the complicated introduction (as I’m sure you got one from both your textbook and your Professor), but remember that z-scores show you the distance between your score and the mean,…

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