Percentage of silica in chondrite meteors

Description

This dataset contains the percentage silica (in %) in 22 chondrite meteors.

Usage

data(chondrite)

Format

chondrite and chondritegg include the data provided in Good and Gaskins (1980). In chondrite, the typo in the 9th observation was corrected while chondritegg includes the original dataset. In chondritel is included the scaled data used by Leonard (1978).

Details

This is a classic example for determining the number of modes.

Source

Obtained from the Table 2 of Good and Gaskins (1980).

References

Good, I. J. and Gaskins, R. A. (1980). Density estimation and bump-hunting by the penalized likelihood method exemplified by scattering and meteorite data. Journal of the American Statistical Association, 75, 42–56.

Leonard, T. (1978). Density estimation, stochastic processes and prior information. Journal of the Royal Statistical Society. Series B (Methodological), 40, 113–146.

Examples

data("chondrite")
# SiZer between the critical bandwidths for one and six modes
sizer(chondrite,cbw1=1,cbw2=6)