[R] Arrange data

[Jim Lemon]

Hi Md,
One way is to form a subset of your data, then calculate the means by year:

# assume your data is named mddat
mddat2<-mddat[mddat$month < 7,]
jan2jun<-by(mddat2$value,mddat2$year,mean)

Jim

On Mon, Aug 3, 2020 at 8:52 PM Md. Moyazzem Hossain <hossainmm using juniv.edu> wrote:
>
> Hi,
>
> I have a dataset having monthly observations (from January to December)
> over a period of time like (2000 to 2018). Now, I am trying to take an
> average the value from January to July of each year.
>
> The data looks like
> Year    Month  Value
> 2000    1         25
> 2000    2         28
> 2000    3         22
> ....    ......      .....
> 2000    12       26
> 2001     1       27
> .......         ........
> 2018    11       30
> 20118   12      29
>
> Can someone help me in this regard?
>
> Many thanks in advance.
>
> *Regards,*
> *Md*
>
>         [[alternative HTML version deleted]]
>
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