R: Northern Cricket Frog

ncfrog {circular} | R Documentation

## Northern Cricket Frog

### Description

In an experiment due to Ferguson et al. (1967) a number of northern cricket frogs (Acris crepitans) were collected from the mud flats of an abandoned stream meandering near Indianola, Mississippi, and taken to a test pen lying to the north west of the collection point. After 30 hours of enclosure within a dark environmental chamber, 14 of them were released and the directions taken by these frogs recorded. 0 degrees means North.

### Usage

    data(ncfrog)

### Format

`ncfrog` is a vector of 14 observations (in degrees). `ncfrog.rad` contains the same observations in radians (pi/180).

### Source

Collett, D. (1980) Outliers in Circular Data Applied Statistics 29, 1, 50–57.

### See Also

Ferguson, D.E, Landreth, H.F. and McKeown, J.P. (1967) Sun compass orientation of the northern cricket frog, Acris crepitans. Anim. Behav., 14, 45–53.

[Package circular version 0.4-93 Index]