![]() QQ PlotĪ PP plot ( point-point plot) is simply a scatter plot comparing two samples of the same size. See Histograms for how to choose the correct bin size. Caution should be exercised when using a histogram to test for normality since the choice of bin sizes may have a dramatic effect on the result. Choosing bins from -2 to 2 standard deviations, we create a histogram as described in Histograms.Īs you can see from Figure 1, the histogram doesn’t look particularly normal in shape. the formula in cell C4 is =STANDARDIZE(B4,$B$24,$B$25). To make sure that the intervals in the histogram are equal and consistent, we first standardize the data points (in column C) as described in Expectation. This test consists of looking at the histogram and discerning whether it approximates the bell curve shape of a normal distribution.Įxample 1: Determine whether the data in column B of Figure 1 are normally distributed using a histogram.įigure 1 – Testing for normality using a histogram A histogram can be used to determine whether data is normally distributed.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |