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Interval-valued acid rain pollution indices for sulphates and nitrates (kg/hectares) by US state.
data(acid_rain.int)
A data frame with 2 observations and 2 interval-valued variables:
sulphate: Sulphate pollution index range (kg/hectares).
sulphate
nitrate: Nitrate pollution index range (kg/hectares).
nitrate
Billard, L. and Diday, E. (2006). Symbolic Data Analysis. Wiley. Table 2.21.
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