usgs.herbicides {agridat} | R Documentation

## Concentrations of herbicides in streams in the United States

### Description

Concentrations of selected herbicides and degradation products determined by laboratory method analysis code GCS for water samples collected from 51 streams in nine Midwestern States,2002

### Usage

    data("usgs.herbicides")

### Format

A data frame with 184 observations on the following 19 variables.

`mapnum`

  map number

`usgsid`

  USGS ID

`long`

  longitude

`lat`

  latitude

`site`

  site name

`city`

  city

`sampletype`

  sample type code

`date`

  date sample was collected

`hour`

  hour sample was collected

`acetochlor`

  concentration as character

`alachlor`

  concentration as character

`ametryn`

  concentration as character

`atrazine`

  concentration as character

`CIAT`

  concentration as character

`CEAT`

  concentration as character

`cyanazine`

  concentration as character

`CAM`

  concentration as character

`dimethenamid`

  concentration as character

`flufenacet`

  concentration as character

### Details

Concentrations of selected herbicides and degradation products determined by laboratory method analysis code GCS for water samples collected from 51 streams in nine Midwestern States, 2002.

All concentrations are micrograms/liter, "<" means "less than". The data are in character format to allow for "<".

The original report contains data for more herbicides. This data is for illustrative purposes.

Sample types: CR = concurrent replicate sample, FB = field blank, LD = laboratory duplicate, S1 = sample from pre-emergence runoff, S2 = sample from post-emergence runoff, S3 = sample from harvest-season runoff.

### Source

Scribner, E.A., Battaglin, W.A., Dietze, J.E., and Thurman, E.M., "Reconnaissance Data for Glyphosate, Other Selected Herbicides, their Degradation Products, and Antibiotics in 51 streams in Nine Midwestern States, 2002". U.S. Geological Survey Open File Report 03-217. Herbicide data from table 5, page 30-37. Site coordinates page 7-8. https://ks.water.usgs.gov/pubs/reports/ofr.03-217.html

### References

None.

### Examples

    data(usgs.herbicides)
    dat <- usgs.herbicides

    ## Not run:

      require("NADA")
      # create censored data for one trait
      dat$y <- as.numeric(dat$atrazine)
      dat$ycen <- is.na(dat$y)
      dat$y[is.na(dat$y)] <- .05

      # percent censored
      with(dat, censummary(y, censored=ycen))
      # median/mean
      with(dat, cenmle(y, ycen, dist="lognormal"))
      # boxplot
      with(dat, cenboxplot(obs=y, cen=ycen, log=FALSE))
      # with(dat, boxplot(y))
      pp <- with(dat, ros(obs=y, censored=ycen, forwardT="log")) # default lognormal
      plot(pp)

    ## End(Not run)

    if(require("NADA")){
      plotfun <- function(vv){
        dat$y <- as.numeric(dat[[vv]])
        dat$ycen <- is.na(dat$y)
        dat$y[is.na(dat$y)] <- .01
        # qqnorm(log(dat$y), main=vv) # ordinary qq plot shows censored values
        pp <- with(dat, ros(obs=y, censored=ycen, forwardT="log"))
        plot(pp, main=vv) # omits censored values
      }
      op <- par(mfrow=c(3,3))
      vnames <- c("acetochlor", "alachlor", "ametryn", "atrazine","CIAT", "CEAT", "cyanazine", #"CAM",
                  "dimethenamid", "flufenacet")
      for(vv in vnames) plotfun(vv)
      par(op)
    }

[Package agridat version 1.16 Index]