# BOD

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## Biochemical Oxygen DemandThe ## UsageBOD ## FormatThis data frame contains the following columns: `Time` -
A numeric vector giving the time of the measurement (days). `demand` -
A numeric vector giving the biochemical oxygen demand (mg/l).
## SourceBates, D.M. and Watts, D.G. (1988),
Originally from Marske (1967), ## Examplesrequire(stats) # simplest form of fitting a first-order model to these data fm1 <- nls(demand ~ A*(1-exp(-exp(lrc)*Time)), data = BOD, start = c(A = 20, lrc = log(.35))) coef(fm1) fm1 # using the plinear algorithm fm2 <- nls(demand ~ (1-exp(-exp(lrc)*Time)), data = BOD, start = c(lrc = log(.35)), algorithm = "plinear", trace = TRUE) # using a self-starting model fm3 <- nls(demand ~ SSasympOrig(Time, A, lrc), data = BOD) summary(fm3) |

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