Kurtosis means peakedness of a distribution. Measuring kurtosis means to examine the extent of peakedness of a distribution as compared with the normal or symmertical distribution. Normal curve is neither flat nor peak and is called Mesokurtic. The curves with greater peakedness than the normal curve are called Leptokurtic. The curves which are flatter than the normal curve are called Platykurtic. We can say that Kurtosis tells us about the middle portion of a frequency curve.
Kelly has given a measure of kurtosis based on percentiles. His formula is
Sk = (P75 - P25) / ( P90- P10)
If S k > .26315, the distribution is Platykurtic
S k < .26315, the distribution is Leptokurtic.
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