Part I of the work characterizes the data of human blood parameters. It describes examined biomedical data set and used multivariate statistical exploratory methods like PCA, FA, MDS and clusters analysis. To the factor analysis methods belongs the biplots visualization method. Biplots are simply the scatterplots with the superimposition of the variables. The work compares different other alternative multivariate exploratory data analysis procedures from methodological point of view. The described multivariate ordination methods are applied in the Part II of the work 'Application'.