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Implementation of Nonstationary normalized Cross-correlation (N2C2)

How to cite

T. T. Yavuz, J. Claassen, and S. Kleinberg. Lagged Correlations among Physiological Variables as Indicators of Consciousness in Stroke Patients. In: AMIA Annual Symposium Proceedings, 2019.

Using the code

Preparation:

  1. Outcome data format: ensure outcome data is a single CSV file with each row being an instance (such as a patient) of the format: ID, time, outcome. Time is when the outcome was measured. The outcome variable is expected to be discrete and categorial.
  2. Predictive data format: this is the data whose lags are being used to predict the outcome. Data should have one CSV file per instance (such as a patient), with one row per measurement time and columns being variables. See below for an example.
  3. Create a directory (inputdir) for the predictive data files using the naming convention Patient_PID_c.csv, where PID is the Patient ID.
  4. Create two output directories, one for output lags (outputdir-lag) and one for the results of statical testing (outputdir-stat).
  5. Choose a parameter setting for window size in the same time unit as your input data (window), and maximum number of lags to search over (maxlag). We used window=300, and maxlag=50, but values will depend on your outcome variable and data granularity. The amount of hours before an outcome assessment you would like to use data from (hours=12; optional, default 0)

To run the code:

  1. python GenerateLags.py outcomes inputdir outputdir-lag window maxlag [hours] (hours being optional)
  2. python ResultGeneration.py outcomes outputdir-lag outputdir-stat window maxlag [hours] (hours being optional)

File format examples

outcomes.csv example

ID,time,outcome 0,60,5 0,120,4 0,180,0 1,240,2 1,300,2 1,360,3

inputdir: has files Patient_ID_c.csv with all the patients' measurements:

Patient_ID_c.csv example:

time, A, B, C, D, E, F, G, H 0,100,10,100,100,100,10,10,100 60,101,11,101,101,101,11,11,101

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