There are also two great video lessons made by Khan Academy, which explain variance in a very easy to follow and entertaining way.
Basics: Dispersion (Variability) of data: Deviation, Variance, Standard Deviation. With video!9/12/2012 Previously, I talked about the mean, median, mode and outliers which described our data in terms of its central tendency. Today I will cover the idea of Variability, or Dispersion. There are three concepts which allow us to determine it: Deviation, Variance and Standard Deviation. There is also such thing as a Standard Deviation, which I will cover in the next post. There are also two great video lessons made by Khan Academy, which explain variance in a very easy to follow and entertaining way.
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In descriptive statistics, there are three concepts which help us describe our data: central tendency (how typical it is), dispersion (how varied it is) and distribution (how data is distributed). In this post I will talk about the central tendency, in other words, determining the AVERAGE of your data. I will discuss three main concepts here: mean, median and mode. I will also discuss the mild and extreme outliers and explain the tricky procedure of identifying them. They actually describe dispersion of data, but because finding them involves some operations with the mean, I decided to show it in this post. |
AuthorI am a 21 years old Psychology undergraduate in Edinburgh University. The idea behind this site is to provide some help to fellow students, to make studying psychology (including stats...) as much fun as possible and motivate me not to skip those 9am lectures! Archive
February 2013
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