How do you interpret skewness and kurtosis in statistics?
For skewness, if the value is greater than + 1.0, the distribution is right skewed. If the value is less than -1.0, the distribution is left skewed. For kurtosis, if the value is greater than + 1.0, the distribution is leptokurtik. If the value is less than -1.0, the distribution is platykurtik.
What does a kurtosis of 1.8 mean?
A kurtosis less than 3 means the tails are lighter than the normal distribution like the Uniform distribution with a kurtosis of 1.8 shown below: A kurtosis value of 4 and above or 2 and below represents a sizable departure from normality.
What is a good kurtosis value?
A standard normal distribution has kurtosis of 3 and is recognized as mesokurtic. An increased kurtosis (>3) can be visualized as a thin “bell” with a high peak whereas a decreased kurtosis corresponds to a broadening of the peak and “thickening” of the tails. Kurtosis >3 is recognized as leptokurtic and <3.
How do you interpret kurtosis in SPSS?
A kurtosis value near zero indicates a shape close to normal. A negative value indicates a distribution which is more peaked than normal, and a positive kurtosis indicates a shape flatter than normal.
How do you describe kurtosis?
Kurtosis is a measure of whether the data are heavy-tailed or light-tailed relative to a normal distribution. That is, data sets with high kurtosis tend to have heavy tails, or outliers. Data sets with low kurtosis tend to have light tails, or lack of outliers.
How do you explain kurtosis?
Kurtosis is a measure of the combined weight of a distribution’s tails relative to the center of the distribution. When a set of approximately normal data is graphed via a histogram, it shows a bell peak and most data within three standard deviations (plus or minus) of the mean.
What does kurtosis represent?
How do you report kurtosis?
For kurtosis, if the value is greater than + 1.0, the distribution is leptokurtic. If the value is less than -1.0, the distribution is platykurtic. +1 and -1 are the limits for both. Greater than 1 means skewed to the right, less than -1 means skewed to the left and therefore deviates significantly from normal.
What does kurtosis indicate?
Kurtosis is a measure of whether the data are heavy-tailed or light-tailed relative to a normal distribution. That is, data sets with high kurtosis tend to have heavy tails, or outliers. Data sets with low kurtosis tend to have light tails, or lack of outliers. A uniform distribution would be the extreme case.
What does negative kurtosis value indicates for a data?
Negative excess values of kurtosis (<3) indicate that a distribution is flat and has thin tails. Platykurtic distributions have negative kurtosis values. A platykurtic distribution is flatter (less peaked) when compared with the normal distribution, with fewer values in its shorter (i.e. lighter and thinner) tails.
How to calculate kurtosis?
Example of Kurtosis Formula (With Excel Template) Let’s take an example to understand the calculation of Kurtosis in a better manner.
How to calculate kurtosis example?
subtract every number in your sample minus the mean, take it to the fourth power and add them up, then divide by the standard deviation to the fourth power then divide by n. Thus you get: ((6-8)^4+(7-8)^4+(8-8)^4+(9-8)^4+(10-8)^4)/(1.41^4 * 5)
Is high kurtosis good or bad?
Kurtosis is only useful when used in conjunction with standard deviation. It is possible that an investment might have a high kurtosis (bad), but the overall standard deviation is low (good). Conversely, one might see an investment with a low kurtosis (good), but the overall standard deviation is high (bad).
How to measure kurtosis?
Kurtosis is measured in the following ways: Moment based Measure of kurtosis = β 2 = 𝜇 4 𝜇2 2 Coefficient of kurtosis = γ 2 = β 2 – 3 Illustration Find the first, second, third and fourth orders of moments, skewness and kurtosis of the following: i. 11, 11, 10, 8, 13, 15, 9, 10, 14, 12, 11, 8 ii.