13Fskewness

= 13F Skewness =


 * When comparing sets of data, one comparison to make is the distribution within the data sets
 * This concept is easiest to see with frequency histograms


 * Normal Distribution **


 * graph is symmetrical
 * mode is in the centre
 * majority of values are in the middle


 * a normal distribution will rarely be as perfectly symmetrical as this but look for this general shape


 * Note that a graph can be symmetrical without being normal distributed


 * Negatively Skewed **


 * graph has a long tail pointing towards the negative numbers on the x-axis
 * mode is to the right of the centre
 * majority of the values are to the right of the centre


 * Positively Skewed **

.
 * graph has a long tail pointing towards the larger positive numbers on the x-axis
 * mode is to the left of the centre
 * majority of the values are to the left of the centre