MATLAB: How to turn monthly data to annual data? data attached for example

beginnerMATLAB

On the file I have attached, how would I turn those months into years using an average? So for example every month of 1959 into just one piece of data where every month is averaged out together. Secondly, what do I do with the start and the end since there's not 12 months for 1958 or 2020?
Thank you,
Richard Marx

Best Answer

Use the retime function to change your time step to 'yearly'. For method, use 'mean'.
load EXAMPLEQUESTIONDATA.mat
retime(TB6MS_,'yearly','mean')
ans = 63x1 timetable
       Time         Var1 
    ___________    ______

    01-Jan-1958      3.01
    01-Jan-1959     3.815
    01-Jan-1960    3.2117
    01-Jan-1961    2.5917
    01-Jan-1962    2.8992
    01-Jan-1963    3.2583
    01-Jan-1964    3.6817
    01-Jan-1965    4.0533
    01-Jan-1966    5.0608
    01-Jan-1967    4.6208
    01-Jan-1968    5.4717
    01-Jan-1969    6.8608
    01-Jan-1970    6.5083
    01-Jan-1971    4.5117
    01-Jan-1972    4.4842
    01-Jan-1973    7.1992
What to do with the data from years that do not have 12 months of data depends on what is accepted practice in your field. There is no hard and fast rule. I'd just be careful to not misrepresent your data. For me, you only have a value for Dec 1958, so I'd probably drop it. However, for 2020 you have Jan-Nov, so I'd probably keep it.
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