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Statistical Application Development with R and Python - Second Edition by Prabhanjan Narayanachar Tattar

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Techniques for exploratory analysis

We will be studying the following techniques:

  • The stem-and-leaf plot
  • Letter values
  • Data re-expression
  • Bagplot—a bivariate boxplot
  • Resistant line
  • Smoothing data
  • Median polish

The stem-and-leaf plot

The stem-and-leaf plot is considered as one of the seven important tools of Statistical Process Control (SPC); refer to Montgomery (2005). It is a bit similar in nature to the histogram plot.

The stem-and-leaf plot is an effective method of displaying data in a (partial) tree form. Here, each datum is split into two parts: the stem part and the leaf part. In general, the last digit of a datum forms the leaf part; the rest form the stem. Now, consider a datum 235. If the split criteria is the units place, the stem and leaf parts ...

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