Mann Kendall returns NaN

Question

SuzieChan 2020-4-12

回答： Ameer Hamza 2020-4-12

Hi,

I have a column of data. Some of this data has NaN values.

When I exeucte the test using the code

[H1,p_value1] = Mann_Kendall(data, 0.05);

The output returns NaN for the p-value.

This is nonsense.

How can I only apply the test to the numerical data, not the data + NaN values?

This will return an accurate result.

Maybe something like 'omitnan' will work?

Or maybe it is not written into the test code?

Any ideas?

Thanks.

Answer 1

Ameer Hamza 2020-4-12

Delete the nan values

data(isnan(data)) = [];
[H1,p_value1] = Mann_Kendall(data, 0.05);

or set them to zeros

data(isnan(data)) = 0;
[H1,p_value1] = Mann_Kendall(data, 0.05);