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Applied Statistics Using SPSS, STATISTICA, MATLAB and R

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484 Appendix E - Datasets<br />

E.29 VCG<br />

The VCG.xls file contains measurements of the mean QRS vector performed in a<br />

set of 120 vectocardiograms (VCG).<br />

QRS designates a sequence of electrocardiographic waves occurring during<br />

ventricular activation. As the electrical heart vector evolves in time, it describes a<br />

curve in a horizontal plane. The mean vector, during the QRS period, is commonly<br />

used for the diagnosis of right ventricular hypertrophy.<br />

The mean vector was measured in 120 patients by the following three methods:<br />

H: Half area: the vector that bisects the QRS loop into two equal areas.<br />

A: Amplitude: the vector computed with the maximum amplitudes in two<br />

orthogonal directions (x, y).<br />

I: Integral: The vector computed with the signal areas along (x, y).<br />

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

Portugal.<br />

E.30 Wave<br />

The Wave.xls file contains eleven angular measurements corresponding to the<br />

direction of minimum acoustic pressure in an ultrasonic radiation field, using two<br />

types of transducers: TRa <strong>and</strong> TRb.<br />

Source: D Freitas, Dep. Engenharia Electrotécnica e de Computadores, Faculdade<br />

de Engenharia, Universidade do Porto, Porto, Portugal.<br />

E.31 Weather<br />

The Weather.xls file contains measurements of several meteorological<br />

variables made in Porto at 12H00 <strong>and</strong> grouped in the following datasheets:<br />

Data 1:<br />

Weather data refers to the period of January 1, 1999 through August 23, 2000. All<br />

measurements were made at 12H00, at “Rua dos Bragas” (Bragas Street), Porto,<br />

Portugal. The variables are:<br />

T: Temperature (ºC);<br />

H: Humidity (%);<br />

WS: Wind speed (m/s),<br />

WD: Wind direction (anticlockwise, relative to North);<br />

NS: Projection of WD in the North-South direction;<br />

EW: Projection of WD in the East-West direction.

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