Statistics using R programming - Normal Quantile-Quantile Plot with R

A quantile of a sample, q(f), is a value for which a specified fraction f of the data values is less than or equal to q(f).
If letting i is the order of the observations when they are ranked from low to high, the fraction can be computed as

f = (i -3/8) / (n + 1/4)

from this f , a normal distribution quantile value can be calculated.
The normal quantile-quantile plot is a plot of y(i) (ordered observations) against quantile value from a standard normal distribution.

A nearly straight-line relationship suggests that the data came from a normal distribution.

A nearly straight-line relationship suggests that the data came from a normal distribution.

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