Aggregate daily level data to weekly level in R

Question

I have a huge dataset similar to the following reproducible sample data.

   Interval    value
1  2012-06-10   552
2  2012-06-11  4850
3  2012-06-12  4642
4          


        

Answer 1

If you mean the sum of of ‘value’ by week I think the easiest way to do it is to convert the data into a xts object as GSee suggested:

data <- as.xts(data$value,order.by=as.Date(data$interval))
weekly <- apply.weekly(data,sum)

            [,1]
2012-06-10   552
2012-06-17 23629
2012-06-24 23872
2012-07-01 23667
2012-07-08 23552
2012-07-10 10902

I leave the formatting of the output as an exercise for you :-)