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Biostatistics by P. Mariappan

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Chapter 6

Skewness, Moments and Kurtosis

Objectives

After completing this chapter, you can understand the following:

  • The definition, meaning and significance of skewness, moments and kurtosis.
  • The method of evaluation of skewness, moments and kurtosis.
  • How these measures can be used to make decisions related to biological studies?
6.1 INTRODUCTION

It refers to the lack of symmetry of a distribution. A symmetrical distribution has the property that the structure of the curve will look like a bell-shape. If a distribution is not symmetrical, it is called as a skewed one. The value of mean, median and mode will be exactly same for a symmetrical distribution. Any difference in the values of the three measures clearly spell out that the corresponding ...

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