Contingency Tables – Fisher’s Exact Test

March 6th, 2010

A contingency table is used in statistics to provide a tabular summary of categorical data and the cells in the table are the number of occassions that a particular combination of variables occur together in a set of data. The relationship between variables in a contingency table are often investigated using Chi-squared tests. Read the rest of this entry »

One and Two Sample Hypothesis Testing

June 26th, 2009

The t-test is regularly used in Classical Statistics to investigate one or two samples of data and to test a particular hypothesis. There are variants on the t-test that are all handled by the same function, t.test, in R. Read the rest of this entry »