Python Pandas: Simple example of calculating RMSE from data frame

Question

Need a simple example of calculating RMSE with Pandas DataFrame. Providing there is function that returns in cycle true and predicted value:

def fun (data):
         


        

Answer 1

Question 1
This depends on the format that data is in. And I'd expect you already have your true values, so this function is just a pass through.

Question 2

With pandas
((df.p - df.x) ** 2).mean() ** .5

With numpy
(np.diff(df.values) ** 2).mean() ** .5