gravity {boot} | R Documentation

## Acceleration Due to Gravity

### Description

The `gravity` data frame has 81 rows and 2 columns.

The `grav` data set has 26 rows and 2 columns.

Between May 1934 and July 1935, the National Bureau of Standards in Washington D.C. conducted a series of experiments to estimate the acceleration due to gravity, g, at Washington. Each experiment produced a number of replicate estimates of g using the same methodology. Although the basic method remained the same for all experiments, that of the reversible pendulum, there were changes in configuration.

The `gravity` data frame contains the data from all eight experiments. The `grav` data frame contains the data from the experiments 7 and 8. The data are expressed as deviations from 980.000 in centimetres per second squared.

### Usage

    data(gravity)

### Format

This data frame contains the following columns:

`g`
  The deviation of the estimate from 980.000 centimetres per second squared.
`series`
  A factor describing from which experiment the estimate was derived.

### Source

The data were obtained from

Cressie, N. (1982) Playing safe with misweighted means. Journal of the American Statistical Association, 77, 754–759.

### References

Davison, A.C. and Hinkley, D.V. (1997) Bootstrap Methods and Their Application. Cambridge University Press.

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