[R] Aggregating on date at Monthly Level

[PIKAL Petr]

Hi

> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Shivi82
> Sent: Wednesday, June 17, 2015 9:19 AM
> To: r-help at r-project.org
> Subject: [R] Aggregating on date at Monthly Level
>
> HI All,
> I have situation where i am aggregating weight on monthly and quarterly
> level.
> I need to summarize weight on variable ship date i.e. shipping date .
> As this date is in a character format so used the conversion as:
>
> Shipdate<-as.Date("retail$ship.date", format="%m-%d-%Y"). But when i
> see the output of Shipdate the result is NA.

Are you sure that format is in aggreement with ship.date?

> typeof(Shipdate) gives me "double". I am not sure what this is var type
> whereas class (Shipdate) is Date so i am a bit puzzled.
>
> Then i have created a new var which sums weight and gives me the
> desired
> result-
> aggr<-aggregate(retail$weight,list(retail$ship.date),mean)
>
> Now if i want to group the result on a Month level i used the below
> syntax and gives me error:
> cut.Date(aggr,breaks = "Month",labels = TRUE). "x must be numeric"- in
> the above syntax i have created it as a list.

AFAIK aggr is data frame with Group.1 column the ship.date and x column the mean weight for each ship.date. If you want to further aggregate on month you can use the same approach with second parameter in aggregate an indication of months. If you want something else you shall be more specific about your data and intended result.

>
> Is there an easier way to achieve what i am looking for. Kindly
> suggest.

Probably easiest way would be if you familiarise yourself with data types and operations e.g. by reading R-intro.

Cheers
Petr

> Thanks, Shivi
>
>
>
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