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2009 Dec 22
1
Using zoo() to aggregate daily data to monthly means
I am trying to get monthly means for a daily data series using zoo(). I have
found an odd problem, that seems to be caused by zoo()'s handling of leap
years.
Here's my R script with 2 methods (freq=365, 366) for aggregating the daily
data to monthly series:
library(zoo)
J_link <- "http://www.ijis.iarc.uaf.edu/seaice/extent/plot.csv"
JAXA_data <- read.table(J_link,
skip = 0, sep = ",", dec=".",
row.names = NULL, header = FALSE,
as.is = T, colClasses = rep("numeric",4),
commen...