To find out SKEWNESS of a data set, “SKEW” function is being used where positive or negative data output can be found.
#NORMAL DISTRIBUTION WITH MEAN AND STANDARD DEVIATION EXCEL HOW TO#
How to measure Skewness and Kurtosis with Excel functions? Kurtosis tells about the outliers present in a data or it can be considered as a measuring technique of outlier. There are two types of Skewness, Right or positive Skewed and Left or negative Skewed. If the Bell Curve is skewed towards left or right and it has a long tail, it is called skewed Bell Curve. To explain the asymmetrical Bell Curve, Skewness and Kurtosis came into the picture. On the other hand, the tail of the Bell Curve can be heavy or light. Many times, we are creating Bell Curve and it is not showing the symmetrical shape, either it is skewed towards left or right.
In earlier paragraph (what is bell curve), it is discussed that bell curve is only possible if data is normally distributed. Same way, 95% data falls under 2 σ and 99.7% data falls under 3 σ. In Bell Curve, if we consider 1s (-1 σ to 1 σ), 68% data falls under 1 standard deviation ( σ). If the data is skewed and bell curve is not symmetrical, in that case Mean and Median will be different and Median can be considered instead of Mean for further analysis.Īdvertisement What is Empirical Rule or Three-Sigma Rule of Bell Curve? Also, the skewness of the data can be found through Bell Curve. As discussed in the beginning that Bell Curve is used to visualize the distribution of data. Why Bell Curve?Īfter discussing what is Bell Curve, next question comes into the mind that why bell curve. If we go towards left or right side from middle, we’ll found the intervals of standard deviation ( σ) denoted by 1s, 2 σ & 3 σ. Middle axis peak of a normally distributed Bell Curve denotes Mean, Median and Mode. In Bell Curve, X axis represents the values of distribution and Y axis represents the frequency of each value.
In other words, Bell Curve is the graphical form of normal distribution. What is the difference between Normal Distribution (Gaussian Distribution) & Non-Normal Distribution?īell Curve is a methodology to understand normal distribution of data.How to measure Skewness and Kurtosis with Excel functions?.What is Empirical Rule or Three-Sigma Rule of Bell Curve?.
0 kommentar(er)
