No.          

Feature name          

Meaning          

MDVP: Fo (Hz)          

F1          

Average vocal fundamental frequency          

MDVP: Fhi (Hz)          

F2          

Maximum vocal fundamental frequency          

MDVP: Flo (Hz)          

F3          

Minimum vocal fundamental frequency          

MDVP: Jitter (%)          

F4          

Jitter as percentage          

MDVP:Jitter(Abs)          

F5          

Absolute jitter in micro second          

MDVP: RAP          

F6          

Amplitude perturbation          

MDVP: PPQ          

F7          

Period perturbation quotient          

Jitter DDP          

F8          

Average absolute differences between cycle,   divided by the average period.          

MDVP: Shimmer          

F9          

Local shimmer          

Shimmer dB          

F10          

Local shimmer in decibels          

Shimmer APQ3          

F11          

3 points amplitude perturbation quotient          

Shimmer APQ5          

F12          

5 points amplitude perturbation quotient          

MDVP: APQ          

F13          

11 points amplitude perturbation quotient          

Shimmer DDA          

F14          

Absolute differences between the   amplitude of consecutive periods.          

NHR          

F15          

Noise-to-harmonic ratio          

HNR          

F16          

Harmonic-to-noise ratio          

DFA          

F17          

Signal fractal scaling exponent          

PPE          

F18          

Pitch period entropy          

spread1          

F19          

Three nonlinear measures of  fundamental frequency variation          

spread2          

F20          

RPDE          

F21          

D2          

F22          

Recurrence period density analysis          

Status          

Health status of the subject (one) Parkinson’s, (zero) healthy