median of grouped data
Like this?
d = read.table(textConnection("ID PM
adt_01 25.255
adt_01 225.36
adt_01 14.2325
adt_02 15
adt_02 12.3
adt_03 15.2
adt_03 148.3
adt_03 25.5
adt_03 14.25"),head=T)
d
d$PM <- as.numeric(d$PM)
ddply(d,.(ID),numcolwise(median))
Felipe D. Carrillo
Supervisory Fishery Biologist Department of the Interior US Fish & Wildlife Service California, USA
--- On Wed, 1/27/10, "Mar?a del Pilar M?rquez" <marquezvilla at wisc.edu> wrote:
From: "Mar?a del Pilar M?rquez" <marquezvilla at wisc.edu> Subject: [R] median of grouped data To: r-help at r-project.org Date: Wednesday, January 27, 2010, 10:05 AM Good morning, I would like to know if is possible somebody can help me with this please: I would like to calculate the median of grouped data, this is an example: ID? ? PM adt_01? 25.255 adt_01? 225.36 adt_01? 14.2325 adt_02? 15 adt_02? 12.3 adt_03? 15.2 adt_03? 148.3 adt_03? 25.5 adt_03? 14.25 I need the median of adt_01, 02 and 03 , I know that I have to split first my data and then ask for the median but the code I have is not working. Thank you very much if you can help me with the code maria
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