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**What is R - Bar Chart?**

This is also one type of control chart that is more suitable to use in the variable of interest in quantitative measures. The measuring of this line is that the chart with help us to see any deviation from any desired limits within a process of quality. And the effect of this is to allow the firms to make the necessary adjustment in the firm to improve quality. The process of constructing it is given below to understand it in proper manners.

The followings are the construction steps:

First of all, select the successive subgroup for the data.

Then find the range of each subgroup, and this can be calculated by less the small value from the biggest value.

Then find the central line for the r chart and that is denoted by r.

Then find the upper control limit and lower control limit for the chart and plot them on the chart. And do not eliminate the subgroup with the points that are out of range.

After plotting the r chart, then we can consider the r bar as a reliable consideration estimated of the range.