Univariate Descriptive Statistics

Start Here

Contents Title page Statistics is Four Things Descriptive and Inferencial statistics Descriptive statistics are simple Inferential statistics are more complicated Descriptive vs Inferencial statistics Univariate, Bivariate, Multivariate The Plan Univariate Descriptive Statistics: to describe a sample Statistics vs Parameters Central Tendency and Dispersion Levels of scaling and statistics Central Tendency: mode, median, mean The Mode The Median A picture showing median and quartiles When you use the median and why The Mean Summation notation and the mean When you use the median and why Dispersion The less spread out the values are, ... For Nominal data, you can only do Information-theoretic Uncertainty The Inter Quartile Range (IQR) Variance Deviation Scores and variability A picture showing deviation scores The mean deviation score Why the mean deviation score is always zero The mean of the squared deviation scores Mean Square, Sum of Squares, and Variance Sample or Population variance Standard Deviation and Variance Mean Square and Root Mean Square Four things about Standard Deviation Standard scores, aka "z-scores" How to calculate standard scores Examples of standard scores A positive z-score means that .... Calculating Standard Deviation Pros and Cons of the basic equation An example of the basic equation showing how it works more of the example in #42 The Computational Formula How the computational formula works The computational formula is less work and easier to do An example showing how the computational formula works How much work do you save? Why the computational formula is better Are you describing a sample or a population? The standard deviation and the mean z-scores and the normal distribution Scotland

Comments or Questions? Home page Information: Univariate Descriptive Statistics Last updated: May 29, 2006 Download presentation file (c) Copyright 2006 William D. Richards