How to find variance and std dev in R?
This recipe helps you find variance and std dev in R
Recipe Objective
How to find variance and standard deviation in R? Variance is the amount of variation/spread in a data set. The standard deviation is the square root of the variance. Standard deviation and variance are needed for conducting many different statistical tests like to calculate the z-score , t-score etc. This recipe illustrates an example of finding variance and standard deviation.
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Step 1 - Define a vector
a <- c(5,10,15,20,25,30)
Step 2- Calculate the mean
print(mean(a)) #using mean()
"Output is ": 17.5
Step 3 - Calculate the variance
print(var(a)) # using var()
"Output is ": 87.5
Step 4- Calculate the standard deviation
print(sd(a)) # using sd()
"Output is ": 9.354143
What Users are saying..
Abhinav Agarwal
I come from Northwestern University, which is ranked 9th in the US. Although the high-quality academics at school taught me all the basics I needed, obtaining practical experience was a challenge.... Read More