1. Title	Cardiac Arrhythmia Database

2. Sources	http://www1.ics.uci.edu/~mlearn/MLSummary.html [arrhythmia]

3. Number of Instances: 452

4. Number of Attributes: 279

5. Attribute Information:

   Variable	Size
   ---------------------
   Arrhythmia	279x452
   Class	1x452

   Arrhythmia:

      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

   Class
      1 Class code 分類結果代碼


6. Missing Attribute Values: Several. (以NaN代表無資料)

7. Class Distribution:

       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