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We have performed a multiparametric analysis of luminosity data for a sampleof 234 normal spiral and irregular galaxies observed in X-rays with the {\itEinstein Observatory}. This sample is representative of S and Irr galaxies,with a good coverage of morphological types and absolute magnitudes. Inaddition to X-ray and optical da ta, we have compiled H-band magnitudes, IRASnear- and far-infrared, and 6cm radio co ntinuum observations for the samplefrom the literature. We have also performed a carefu l compilation of distanceestimates. We have explored the effect of morphology by dividing the sampleinto early (S0/a-Sab), intermediate (Sb-Sbc), and late-type (Sc-Irr)subsamples. The data were analysed with bivariate and multiv ariate survivalanalysis techniques that make full use of all the information available in bothdetections and limits

A Multivariate Statistical Analysis of Spiral Galaxy Luminosities. I. Data and Results