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Applied Statistics Using SPSS, STATISTICA, MATLAB and R

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478 Appendix E - Datasets<br />

DATE_REOP: Re-operation date.<br />

The Survival Data worksheet contains the data needed for the “time-untilevent”<br />

study <strong>and</strong> includes the following variables computed from the previous<br />

ones:<br />

EC: TRUE, if endocarditis has occurred; FALSE, otherwise.<br />

EVENT: True, if an event (re-operation, death, endocarditis) has occurred<br />

DATE_STOP: Final date for the study, computed either from the events<br />

(EVENT=TRUE) or as the maximum of the other dates (last<br />

consultation, etc.) (EVENT=FALSE).<br />

Source: Centro de Cirurgia Torácica, Hospital de São João, Porto, Portugal.<br />

E.17 Infarct<br />

The Infarct.xls file contains the following measurements performed on 64<br />

patients with myocardial infarction:<br />

EF: Ejection Fraction = (dyastolic volume - systolic volume)/dyastolic<br />

volume, evaluated on echocardiographic images.<br />

CK: Maximum value of creatinokynase enzyme (measuring the degree of<br />

muscular necrosis of the heart).<br />

IAD: Integral of the amplitude of the QRS spatial vector during abnormal<br />

depolarization, measured on the electrocardiogram. The QRS spatial<br />

vector is the electrical vector during the stimulation of the heart left<br />

ventricle.<br />

GRD: Ventricular gradient = integral of the amplitude of the QRST spatial<br />

vector. The QRST spatial vector is the electrical vector during the<br />

stimulation of the heart left ventricle, followed by its relaxation back<br />

down to the restful state.<br />

SCR: Score (0 to 5) of the necrosis severeness, based on the<br />

vectocardiogram.<br />

Source: C Abreu-Lima, Faculdade de Medicina, Universidade do Porto, Porto,<br />

Portugal.<br />

E.18 Joints<br />

The Joints.xls file contains 78 measurements of joint surfaces in the granite<br />

structure of a Porto street. The variables are:<br />

Phi: Azimuth (º) of the joint.<br />

Theta: Pitch (º) of the joint.

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