Calculates the mean/median from grouped data in R?
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