Tagged Questions

5
votes
1answer
206 views

Is there an intuitive interpretation of a negative variogram “nugget” value?

A variogram plots the variance of the difference between sample pairs on a field (any dimensionality) against spatial separation (the "lag") of those samples. The extrapolation from observed ...
3
votes
1answer
507 views

Analysing periodicity in sparse time series

I am interested in looking for periodicities in a several day long recording of electrical activity. The traces present a very steady baseline over which, from time to time, some short events (300-500 ...
4
votes
0answers
349 views

What is the best way to compare fluctuations of two signals?

I have some data acquired by an acoustic sensor with 1 Hz sampling rate. Due to some inevitable issues, I have some noise in my signal, saying 10% pollution. I'm looking for a reliable method for ...
7
votes
1answer
920 views

Using autocorrelation to find commonly occurring signal fragments

I have a sensor which is capturing accelerometer data as a person walks. What I'm interested in extracting is each signal fragment when a step is taken. The Z-axis is what is used since only one axis ...