[R] Calculates the mean/median from grouped data in R?
David Winsemius
dwinsemius at comcast.net
Wed May 8 06:02:41 CEST 2013
On May 7, 2013, at 8:40 PM, jpm miao wrote:
> Is there a function in R that calculate the mean and median for a grouped
> data?
> For example, a survey shows the oil price outlook in the future. How can I
> calculate the mean/median?
> (Of course, I understand that the groups "below 80" and "above 110" must be
> defined more specifically)
>
> below 80 4 80-90 5 90-100 8 100-110 7 above 110 3
>
Why would all groups need to be defined more specifically? How do we know whether items in the 80-90 range are evenly distributed? .... could be 80, 81, 82, 84, 85 or all 89's.
David Winsemius
Alameda, CA, USA
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