Calculate skewness in excel



One of Excel statistical functions is the skewness function.This function can be used to calculate the skewness of a dataset.Skewness characterizes the degree of asymmetry of a distribution around its mean. Positive skewness indicates a distribution with an asymmetric tail extending toward more positive values. Negative skewness indicates a distribution with an asymmetric tail extending toward more negative values.

Syntax for Skewness
SKEW(number1,number2,...)

With:
Number1, number2 ... are 1 to 255 arguments for which you want to calculate skewness. You can also use a single array or a reference to an array instead of arguments separated by commas.

Notes :
a. Arguments can either be numbers or names, arrays, or references that contain numbers.
b. Logical values and text representations of numbers that you type directly into the list of arguments are counted.
c. If an array or reference argument contains text, logical values, or empty cells, those values are ignored; however, cells with the value zero are included.
d. Arguments that are error values or text that cannot be translated into numbers cause errors.
e. If there are fewer than three data points, or the sample standard deviation is zero, SKEW returns the #DIV/0! error value.

For example :

1. Create table below
Type data on column A
skewness

2. On cell C3 create formula to calculate skewness
type:
=SKEW(A3:A13)

You can download this example file in xlsx format on attachments files.



Ĉ
papao nn,
Oct 11, 2011, 1:54 PM
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