Histogram

Histograms are useful visual graphs in looking at frequencies of given events. A histogram is set up as such where the groups of data being measured is separated into classes along the x-axis while the frequency amounts are lined up on the y axis. A histogram is extremely useful in providing a graphical summary to the shape of the distribution of the data. The graph below shows the length of time in weeks to receive a contraceptive and the frequency of the observed times.





http://cs.anu.edu.au/escience/lecture/cg/CGIntroduction/Data/histogram.gif