BIB-VERSION:: CS-TR-v2.0
          ID:: STAN//CS-TR-65-21
       ENTRY:: January 19, 1996
ORGANIZATION:: Stanford University, Department of Computer Science
       TITLE:: Vectorcardiographic analysis by digital computer, selected
               results
        TYPE:: Technical Report
      AUTHOR:: Fisher, Donald D.
      AUTHOR:: Groeben, Jobst von der
      AUTHOR:: Toole, J. Gerald
        DATE:: May 1965
       PAGES:: 108
    ABSTRACT:: Instrumentation, recording devices and digital computers now
               may be combined to obtain detailed statistical measures of
               physiological phenomena. Computers make it possible to study
               several models of a system in depth as well as breadth. This
               report is concerned with methods employed in a detailed
               statistical study of some 600 vectorcardiograms from
               different "normal" individuals which were recorded on analog
               magnetic tape using two different orthogonal lead systems
               (Helm, Frank) giving a total of 1200 cardiograms. A "normal"
               individual is defined as one in which no abnormal heart
               condition was detected by either medical history or physical
               examination. One heartbeat in a train of 15 or 20 was
               selected for digitization. An average of 1.2 seconds worth of
               data was digitized from each of the three vector leads
               simultaneously at a rate of 1000 samples per second for each
               lead giving a total of over ${4.10}^6$ values.

               Statistical models by sex and lead system of the P wave and
               QRS complex (at 1 millisecond intervals) and T wave
               (normalized to 60 points in time) were obtained for 43 age
               groups from age 19 to 61 in rectangular coordinates, polar
               coordinates and ellipsoidal fit (F-test) coordinates. Several
               programs were written to perform the analyses on an IBM 7090.
               Two of the programs used 300000+ words of disk storage to
               collect the necessary statistics. Various aspects of the
               study are presented in this report.
       NOTES:: [Adminitrivia V1/Prg/19960119]
         END:: STAN//CS-TR-65-21