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tcd
2011 Aug 26
1
Time Series data with data every half hour
...the USGS with data every 30 minutes from
4/27/2011 to 8/25/2011.
I am having trouble with setting the frequency.
My R script is below:
> shavers=read.csv("shavers.csv")
> names(shavers)
[1] "agency_cd" "site_no" "datetime" "tz_cd" "Temp"
[6] "X04_00010_cd" "EC25" "X05_00095_cd" "DO"
"X06_00300_cd"
[11] "pH" "X07_00400_cd"
> as.POSIXct(shavers[1,3])
[1] "2011-04-27 EDT"
> as.POSIXct(shavers[nro...