Logarithmic normal

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  • The revised and updated Second Edition includes new subchapters on evolutionary Blackman-Tukey, Lomb-Scargle and Wavelet powerspectral analyses (Chapters 5.6 – 5.8), statistical analysis of point distributions and digital elevation models (Chapters 7.9 and 7.10), and a new chapter on the statistical analysis of directional data (Chapter 10). Whereas undergradu- ates participating in a course on data analysis might go through the entire book, the more experienced reader will use only one particular method to solve a specifi c problem.

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  • The responses are measured in decibels. An audiogram is a plot of intensity in decibels of hearing threshold versus frequency. A decibel (dB) is equal to 20 times the logarithm of the ratio of the sound pressure required to achieve threshold in the patient to the sound pressure required to achieve threshold in a normal hearing person. Therefore, a change of 6 dB represents doubling of sound pressure, and a change of 20 dB represents a tenfold change in sound pressure.

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  • Erythropoietin levels in response to anemia. When the hemoglobin level falls to 120 g/L (12 g/dL), plasma erythropoietin levels increase logarithmically. In the presence of renal disease or chronic inflammation, EPO levels are typically lower than expected for a particular level of anemia. As individuals age, the level of EPO needed to sustain normal hemoglobin levels appears to increase. (From Hillman et al.

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