Data sets:

• Part I: below detection limit observations
  • zinc.txt Zinc (Zn) data set. values of 7 are

    heron.txt Blood lead (Pb) in herons/ Two variables: Pb concentration (ug/g) in blood, Censoring flag: TRUE if value is < dl.

    oahu.txt Arsenic (As) in Oahu stream

    AgMercury.txt Mercury in 42 fish collected in agricultural watersheds. 2 variables, Hg: mercury concentrations (ug/g wet weight of fish), Cens: TRUE if censored

    UrbanMercury.txt Mercury in 34 fish collected in urban watersheds. Same variables as AgMercury.txt

    Cadmium.txt Cadmium in 19 Colorado fish collected in two regions of the state. 3 variables, Cd: Cadmium (ug/g), Region (mtn or plateau), Cens: TRUE if censored at Cd

    cu.txt Copper concentrations in two geomorphic regions of the San Juaquin valley, CA. 3 variables, cu: Copper (ug/g), cens: TRUE if censored, group (geomorphic region). This is a 20 observation subset of the full data, used to illustrate hypothesis tests.

• Part II: Toxicology
  • minnow.txt Death of minnows exposed to floranthene. Columns are the concentration, the number dying, and the number exposed.
  • deguelin.txt Death of Chrysanthemum aphids exposed to deguelin. Columns are the dose of deguelin, the log10 dose, the number dead, and the number exposed.
  • ethyglycol.txt Death and malformation in litters of pregnant rats exposed to ethylene glycol. Each row is a rat litter. The variables are the dose, the number of deaths and malformations, and the litter size.
  • chlorpyrifos.txt Death in Amphiascus, a harpacticoid copepod, exposed to the pesticide chlorpyrifos. Each row is a beaker; variables are the stage (N: nauplii, or A: adult), the dose, the number of live individuals, and the number of individuals in the beaker at the start of the trial.
    Note: Count is the number of live individuals (backwards from usual). Dead is n - count.
• Part II: Trends
  • temp.txtSea surface temperature in Northern Hemisphere oceans. Five columns: year, Winter temp, Spring temp, Summer temp, Fall temp. All temperatures are reported as 'temperature anomalies', i.e. the deviation from a 30 year average temperature.
  • SkaggittHN3.txtAmmonia concentrations, reported as mg/l N, in a small river in Skaggitt County Washington. Columns are the date, the recorded value, a censoring flag (U = below dl) and the country (always Skaggitt). Values are separated by commas.