apple: Worm Infestations in Apple Crops

Description Format Details Source Examples

Description

The apple data frame provides the number of apples (in 100s) on 18 different apple trees. For 12 trees, the percentage of apples with worms (x 100) is also given.

Format

This data frame contains the following columns:

size

hundreds of apples on the tree.

worms

percentage (x100) of apples harboring worms.

Details

These data constitute Table 6.1 in Little and Rubin (1987), adapted from Table 6.9.1 of Snedecor and Cochran (1967).

Source

Little, R. J. A., and Rubin, D. B. (1987) Statistical Analysis with Missing Data. New York: Wiley.

Snedecor, G. W., and Cochran, W. G. (1967) Statistical Methods, 6th ed. Ames: Iowa State University Press.

Examples

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