Data are measured from children in two consecutive years, and the children were living close to a lead smelter. Data are from "Neuropsychological Dysfunction in Children with Chronic Low-Level Lead Absorption, " by P.J. Landrigan, R.H. Whitworth, R.W. Baloh, N.W. Staehling, W.F. Barthel, and B.F. Rosenblum, Lancet, Vol. 1, Issue 7909.
LEAD is blood lead level group [1=low lead level (blood lead levels < 40 micograms/100 mL in both years; 2 = medium lead level (blood lead levels >= 40 micrograms/100 mL in exactly one of the two years); 3 = high lead levels (blood lead levels >= 40 micrograms/100 mL in both years)].
AGE is age in years
SEX is sex of subject (1=male,2=female)
YEAR1 is blood lead level in first year
YEAR2 is blood lead level in second year
IQV is measured verbal IQ score
IQP is measured performance IQ score
IQF is measured full IQ score
A data frame with 121 rows and 8 variables
Triola, M. 2014. Elementary Statistics, 12th ed. Boston, MA: Pearson.
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