Probability Plot Correlation Coefficient. We focus on understanding what says about a scatterplot. Each member of the dataset gets plotted as a point whose x-y coordinates relates to its values for the two variables.
Jun 20 2008 The probability plot correlation coefficient PPCC test has been known as a powerful but easy-to-use goodness-of-fit test. The proposed test statistic is conceptnally simple is compntationally convenient and is readily extendible to testing non-normal distributional hypotheses. This technique is appropriate for families such as the Weibull that are defined by a single shape parameter and location and scale parameters and it is not appropriate for distributions such as.
The correlation coefficient of the points on the normal probability plot can be compared to a table of critical values to provide a formal test of the hypothesis that the data come from a normal distribution.
An empirical power strldy shows that the normal probability plot correlation coefficient compares favorably with 7 other normal test statistics. Another procedure for constructing a test statistic from a probability plot was proposed by Shapiro and Wilk 1965. This question hasnt been answered yet Ask an expert. Goodness-of-fit tests are constructed.
