[R] About data manipulation

[jim holtman]

You did not provide any data, but I will take a stab at it using the
"dplyr" package

library(dplyr)
DT %>%
    group_by(month, id, note) %>%
    summarise(avg = mean(total))



Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

On Sat, Nov 26, 2016 at 11:11 AM, lily li <chocold12 at gmail.com> wrote:

> Hi R users,
>
> I'm trying to manipulate a dataframe and have some difficulties.
>
> The original dataset is like this:
>
> DF
> year   month   total   id     note
> 2000     1         98    GA   1
> 2001     1        100   GA   1
> 2002     2         99    GA   1
> 2002     2         80    GB   1
> ...
> 2012     1         78    GA   2
> ...
>
> The structure is like this: when year is between 2000-2005, note is 1; when
> year is between 2006-2010, note is 2; GA, GB, etc represent different
> groups, but they all have years 2000-2005, 2006-2010, 2011-2015.
> I want to calculate one average value for each month in each time slice.
> For example, between 2000-2005, when note is 1, for GA, there is one value
> in month 1, one value in month 2, etc; for GB, there is one value in month
> 1, one value in month 2, between this time period. So later, there is no
> 'year' column, but other columns.
> I tried the script: DF_GA = aggregate(total~year+month,data=subset(DF,
> id==GA&note==1)), but it did not give me the ideal dataframe. How to do
> then?
> Thanks for your help.
>
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>
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