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Author: rcv911

README.md

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-# periodogram
+# EEG periodogram. Analysis of biomedical data.
+
+## Description
+
+We could call this signal from a biological or medical source - just simple a biosignal. 
+The biosignal could be at the molecular level, cell level, or a systemic or organ level. 
+
+>Examples include the electrocardiogram (ECG), or electrical activity from the heart; speech signals;
+the electroencephalogram (EEG), or electrical activity from the brain; evoked potentials (EPs, i.e.,
+auditory, visual, somatosensory, etc.), or electrical responses of the brain to specific peripheral
+stimulation; the electroneurogram, or field potentials from local regions in the brain; action potential
+signals from individual neurons or heart cells; the electromyogram (EMG), or electrical activity from
+the muscle; the electroretinogram from the eye; and so on.
+
+We are going to use real [EEG data]() from one subject.
+
+## Motivation
+
+Analysis of biosignals is one of the most important thing now. Doctors doesn't have skills in programming languages, 
+but they know a lot about medical things. Programmers can solve this problem, creating tools for doctors and helping them with detecting or 
+estimating quickly. 
+ 
+>Clinically, biomedical signals are primarily acquired for monitoring (detecting or estimating)
+specific pathological/physiological states for purposes of diagnosis and evaluating therapy. In some
+cases of basic research, they are also used for decoding and eventual modeling of specific biological
+systems. 
+
+
+## Results
+
+Here's EEG time series and EEG spectrum from different 5 sec records. Number of record: 7, 21 and 50. 
+
+![](images/eeg_spectrum_7.png)
+![](images/eeg_spectrum_21.png)
+![](images/eeg_spectrum_50.png)
+
+Look at the spectrum. It has fluctuations of 13-40 Hz, so you can see [betta waves](https://en.wikipedia.org/wiki/Beta_wave)
+It's just simple example. If we talk about statistic data or how it helps in diagnostic we cannot use this data. 
+First of all we need to average 84 records. [See this repository]()
+
+## Learn more
+
+- [Wiki](https://en.wikipedia.org/wiki/Electroencephalography)
+
+## Installation
+
+You can use [Python](https://www.python.org/) with data package: [Anaconda](https://www.anaconda.com/) or [Miniconda](https://conda.io/miniconda).
+There's another way - use [Portable Python](http://portablepython.com/). Also you can use whatever IDE for Python.
+
+## License
+
+Free

data files/how to understand data.txt

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+This is real EEG data from one subject. 
+The one recording lasts 5 seconds.
+
+First, it's 4 channels of EEG.
+Second, it's 84 records of 4 channels in each data files.
+
+Sample rate is 0.004 (dt = 0.004)
+Length of one record is 1250 (N = 1250)