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Sound Pressure of Dolphin Sonar

Keywords: nonlinear regression, outlier


The data give the sound pressure of sonar signals ("clicks") from a dolphin at various ranges to target. The measurements were made off the coast of Iceland near Keflavik in 1998. The pressure measurement given is

raw pressure + a Range

where a is a known constant depending on the water density. Pressure is expected to increase with distance even after the adjustment.

Variable Description

Range Distance to dolphin in metres
SoundPressure Water sound pressure adjusted for water density


Data File (tab-delimited text)


Marianne Rasmussen, Department of Biology, Odense University, Denmark.


A simple power growth curve SoundPressure = a Rangeb seems adequate. There is an outlier.



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