accelQC Methods for generic quality control of 3D accelerometer data references and further reading http://stanford.edu/~mwaskom/software/seaborn/ http://docs.scipy.org/doc/scipy-dev/reference/signal.html http://en.wikipedia.org/wiki/Spectral_density_estimation http://docs.scipy.org/doc/numpy/reference/routines.fft.html https://databricks.com/blog/2015/02/17/introducing-dataframes-in-spark-for-large-scale-data-science.html https://github.com/ipython/ipython/wiki/A-gallery-of-interesting-IPython-Notebooks