It indicates x values have a tendency to be lower than the y values. The x – quantiles are lower than the y – quantiles.Hence we can say that the distributions are not the same. Here you can see that most of the points are lying below the line and few points are above the line. It indicates y values have a tendency to be lower than x values.Īnd in practice it is not always possible to get 100 percent as shown above but the plot looks as shown below. The y – quantiles are lower than the x – quantiles.Here the points are lying nearly on the straight line.
It indicates that two samples have similar distributions.Īnd in practice it is always not possible to get such a 100 percent clear straight line but the plot looks like below.
qqplot (Quantile-Quantile Plot) in Python.ISRO CS Syllabus for Scientist/Engineer Exam.The QQ plot shows the expected distribution of association test statistics (X-axis) across the million SNPs compared to the observed values (Y-axis). ISRO CS Original Papers and Official Keys by the same method.One statistical tool, called the ‘QQ plot’ is a common way for GWAS to show that confounders aren’t at work.GATE CS Original Papers and Official Keys.