Phosphorous Concentrations in Speed River, Monthly
Monthly time series of phosphorous (P) concentrations in mg/l, Speed River, Guelph, Ontario, 1972.1-1977.1."
data(GuelphP)
The format is: Time-Series [1:72] from 1972 to 1978: 0.47 0.51 0.35 0.19 0.33 NA 0.365 0.65 0.825 1 ... - attr(*, "title")= chr "Phosphorous Data,Speed River,Guelph,1972.1-1977.1"
See Hipel and McLeod (2005, pp.707-709 and p.986). Hipel and McLeod used intervention analysis to estimate the effect of a phosphorous removal scheme. Intervention analysis was also used to estimate the missing values.
Hipel, K.W. and McLeod, A.I., (2005). Time Series Modelling of Water Resources and Environmental Systems. Electronic reprint of our book orginally published in 1994. http://www.stats.uwo.ca/faculty/aim/1994Book/.
data(GuelphP) plot(GuelphP) #replace missing values in the series with estimates obtained from Hipel and McLeod # (2005, p. 986) missingEst<-c(0.1524, 0.2144, 0.3064, 0.1342) GuelphP2<-GuelphP GuelphP2[is.na(GuelphP)]<-missingEst
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