# How to calculate rmse in daily and monthly scale?

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sasan feyzi 2022 年 5 月 20 日

Hello
I have a problem in calculating rmse in daily and weekly time scale.
I have two matrixes as A for real measurement and B for predictoin both are 30x1
like :
A = [3;8;...;7;9];
B = [2;6;...;11;7];
How can i calculate rmse for A and B in daily and monthly time scale and compare them?
Any help will be appreciated.

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### 回答 (1 件)

dpb 2022 年 5 月 20 日
Where's the date data to go with the data -- or is it daily for a given 30-day month, maybe?
If so, use a timetable with the date and then retime or groupsummary using the builtin timing methods.
You'll want to combine A and B into the single table and use an anonymous function to compute the rmse from the difference between the two columns, it's not a builtin function to apply between the two, although you could also then build the difference as a third variable and just operate over it to compute the std deviation.

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