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+## About Dataset
+### Title: Cardiac Arrhythmia Database
+
+### Sources:
+(a) Original owners od Database:
+-- 1. H. Altay Guvenir, PhD.,
+Bilkent University,
+Department of Computer Engineering and Information Science,
+06533 Ankara, Turkey
+Phone: +90 (312) 266 4133
+Email: guvenir@cs.bilkent.edu.tr
+
+-- 2. Burak Acar, M.S.,
+Bilkent University,
+EE Eng. Dept.
+06533 Ankara, Turkey
+Email: buraka@ee.bilkent.edu.tr
+
+-- 2. Haldun Muderrisoglu, M.D., Ph.D.,
+Baskent University,
+School of Medicine
+Ankara, Turkey
+
+(b) Donor: H. Altay Guvenir
+Bilkent University,
+Department of Computer Engineering and Information Science,
+06533 Ankara, Turkey
+Phone: +90 (312) 266 4133
+Email: guvenir@cs.bilkent.edu.tr
+
+(c) Date: January, 1998
+
+### Past Usage:
+
+H. Altay Guvenir, Burak Acar, Gulsen Demiroz, Ayhan Cekin
+"A Supervised Machine Learning Algorithm for Arrhythmia Analysis"
+Proceedings of the Computers in Cardiology Conference,
+Lund, Sweden, 1997.
+
+The aim is to determine the type of arrhythmia from
+the ECG recordings.
+
+Relevant Information:
+This database contains 279 attributes, 206 of which are linear
+valued and the rest are nominal.
+
+Concerning the study of H. Altay Guvenir: "The aim is to distinguish
+between the presence and absence of cardiac arrhythmia and to
+classify it in one of the 16 groups. Class 01 refers to 'normal'
+ECG classes 02 to 15 refers to different classes of arrhythmia
+and class 16 refers to the rest of unclassified ones. For the
+time being, there exists a computer program that makes such a
+classification. However there are differences between the
+cardiolog's and the programs classification. Taking the
+cardiolog's as a gold standard we aim to minimise this difference
+by means of machine learning tools."
+
+The names and id numbers of the patients were recently
+removed from the database.
+
+Number of Instances: 452
+
+Number of Attributes: 279
+
+Attribute Information:
+-- Complete attribute documentation:
+1 Age: Age in years , linear
+2 Sex: Sex (0 = male; 1 = female) , nominal
+3 Height: Height in centimeters , linear
+4 Weight: Weight in kilograms , linear
+5 QRS duration: Average of QRS duration in msec., linear
+6 P-R interval: Average duration between onset of P and Q waves
+in msec., linear
+7 Q-T interval: Average duration between onset of Q and offset
+of T waves in msec., linear
+8 T interval: Average duration of T wave in msec., linear
+9 P interval: Average duration of P wave in msec., linear
+Vector angles in degrees on front plane of:, linear
+10 QRS
+11 T
+12 P
+13 QRST
+14 J
+
+15 Heart rate: Number of heart beats per minute ,linear
+
+Of channel DI:
+Average width, in msec., of: linear
+16 Q wave
+17 R wave
+18 S wave
+19 R' wave, small peak just after R
+20 S' wave
+
+21 Number of intrinsic deflections, linear
+
+22 Existence of ragged R wave, nominal
+23 Existence of diphasic derivation of R wave, nominal
+24 Existence of ragged P wave, nominal
+25 Existence of diphasic derivation of P wave, nominal
+26 Existence of ragged T wave, nominal
+27 Existence of diphasic derivation of T wave, nominal
+
+Of channel DII:
+28 .. 39 (similar to 16 .. 27 of channel DI)
+Of channels DIII:
+40 .. 51
+Of channel AVR:
+52 .. 63
+Of channel AVL:
+64 .. 75
+Of channel AVF:
+76 .. 87
+Of channel V1:
+88 .. 99
+Of channel V2:
+100 .. 111
+Of channel V3:
+112 .. 123
+Of channel V4:
+124 .. 135
+Of channel V5:
+136 .. 147
+Of channel V6:
+148 .. 159
+
+Of channel DI:
+Amplitude , * 0.1 milivolt, of
+160 JJ wave, linear
+161 Q wave, linear
+162 R wave, linear
+163 S wave, linear
+164 R' wave, linear
+165 S' wave, linear
+166 P wave, linear
+167 T wave, linear
+
+168 QRSA , Sum of areas of all segments divided by 10,
+( Area= width * height / 2 ), linear
+169 QRSTA = QRSA + 0.5 * width of T wave * 0.1 * height of T
+wave. (If T is diphasic then the bigger segment is
+considered), linear
+
+Of channel DII:
+170 .. 179
+Of channel DIII:
+180 .. 189
+Of channel AVR:
+190 .. 199
+Of channel AVL:
+200 .. 209
+Of channel AVF:
+210 .. 219
+Of channel V1:
+220 .. 229
+Of channel V2:
+230 .. 239
+Of channel V3:
+240 .. 249
+Of channel V4:
+250 .. 259
+Of channel V5:
+260 .. 269
+Of channel V6:
+270 .. 279
+
+Missing Attribute Values: Several. Distinguished with '?'.
+
+Class Distribution:
+Database: Arrhythmia
+
+Class code : Class : Number of instances:
+01 Normal 245
+02 Ischemic changes (Coronary Artery Disease) 44
+03 Old Anterior Myocardial Infarction 15
+04 Old Inferior Myocardial Infarction 15
+05 Sinus tachycardy 13
+06 Sinus bradycardy 25
+07 Ventricular Premature Contraction (PVC) 3
+08 Supraventricular Premature Contraction 2
+09 Left bundle branch block 9
+10 Right bundle branch block 50
+11 1. degree AtrioVentricular block 0
+12 2. degree AV block 0
+13 3. degree AV block 0
+14 Left ventricule hypertrophy 4
+15 Atrial Fibrillation or Flutter 5
+16 Others 22
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