Cricket is a sport that generates a large volume of performance data and corresponding debate about the relative qualities of various players over their careers and in relation to their contemporaries. The cricinfo website has an extensive database of statistics for professional cricketers that can be searched to access the information in various formats. Read the rest of this entry »
Charting the performance of cricket all-rounders – IT Botham
August 16th, 2010R and Tolerance Intervals
April 19th, 2010Confidence intervals and prediction intervals are used by statisticians on a regular basis. Another useful interval is the tolerance interval that describes the range of values for a distribution with confidence limits calculated to a particular percentile of the distribution. The R package tolerance can be used to create a variety of tolerance intervals of interest. Read the rest of this entry »
Box and Whisker Plots for Summarising Data
August 11th, 2009We have considered using a histogram to summarise univariate data but there are other types of plot such as the box and whisker plot that can be used summarised univariate data. The box and whisker plot is a graphical method for summarising numerical data based on a five-number summary. These five numbers are the minimum, lower quartile, median, upper quartile and maximum value. Read the rest of this entry »
Using Histograms to Summarise Data
June 8th, 2009It is not only possible to use tabular displays to summarise a data set and we will often be interested in using a graphical display as this might be a more effective way to visualise our data rather than using statistics such as the mean or standard deviation. Read the rest of this entry »
Working with Probability Distributions
May 31st, 2009Probability distributions have a central role in Statistics and the R software has functions to work with a large range of distributions – the syntax has been selected to provide some consistency based on the type of information required about a distribution. Read the rest of this entry »
