Okay. So, a variance is the average of the squares of the differences from the mean then to get a variance, you can do something like these are the after variance to get a variance for one column, we can do RDF sepal length or the variable name and then though are the ones here. So, we can do something like this k pre k green dot errors okay then here I can change to the sepal length doc parents Katie's okay and we do not need them anymore. Okay, then I can run the code here. So all these are the various formalities are either c column or these are variables. And then this is the variance for these separate Lana variable here.