Monday, August 23, 2010

Drawing quantile-quantile qq plots with R

Quantile-quantile plots gives the most visually appealing method to view the extent of normality of a vector or a two-column matrix of data. Data is either a single column (Y) or two column (X, Y). If nvars is 1, will display qqnorm(y). Otherwise, if nvars is 2, will display qqplot(x,y). Data is always read row wise(byrow=TRUE).

Optionally, line passing thru Q1 and Q3 is drawn if Line? is TRUE. If data on X axis is TRUE, data values will be shown in X-axis otherwise on the Y-axis.


A qq plot may be generated by our solver at /solvers/rplotpage/qq

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