Some other pages on our site you may enjoy:
EFxHist - Fundamental Frequency Histograms
EFxHist is a program to analyse joint speech and laryngograph recordings. EFxHist locates each pitch period in the laryngograph waveform and produces statistical analyses including distributions of fundamental frequency, closed-quotient, jitter and shimmer. More information.
Web Tutorial on Logs
A tutorial that provides an elementary introduction to the mathematics of Logarithms. More information.