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The most common objective of the statistical analysis is to explain the influence of random variations and events. Perhaps the most important objective is to manage simultaneous and combined effects of several influencing factors, when those factors can not be easily controlled in the experimental frame.
Multivariate Analysis - MVA is based on the principle of multidimensional statistics, which involves observation and analysis of several statistical variables at a time. This analysis is used to study several dimensions simultaneously, taking into account the effects of all variables on the characteristics of interest [1-4].
By introducing ceramic properties of some dense composite ceramics, zirconia - alumina type, with oxide additives for densification as independent variables, it was obtained a quality model. The model proved that it is necessary a more rigorous control of these properties in order to improve the compressive strength [5-6].
The developed statistical models are consistent with existing assertions in this area - they are viable, but also offers new insights - of interest from the point of view of optimizing the composition and properties of specific ceramics.
Cel mai cunoscut obiectiv al analizei statistice este acela de a explica influenta variatiilor aleatorii. Probabil cel mai important obiectiv este acela de a descurca efectele simultane si combinate ale mai multor factori de influenta, În situatii În care acei factori nu pot fiusor controlati În cadrul experimentului.
Analiza multidimensionala (MVA - Multivariate Analysis) se bazeaza pe principiul statisticii multidimensionale, care implica observarea si analizarea mai multor variabile statistice Într-un moment. Aceasta analiza este folosita pentru a studia mai multe dimensiuni concomitent, tinând cont de efectele tuturor variabilelor asupra caracteristicilor de interes.
Prin introducerea proprietatilor ceramice ale unor ceramici compozite dense de tip zircona - alumina, cu aditivi oxidici pentru densificare, ca variabile independente obtinem un model calitativ superior. Acest model dovedeste ca este necesar un control mai riguros al acestor proprietati pentru a Îmbunatati rezistenta mecanica la compresiune.
Modelele statistice create sunt În concordanta cu asertiunile deja existente În acest domeniu - sunt viabile, dar ofera si perspective noi - prezinta interes, din punctul de vedere al optimizarii atât a compozitiilor cât si a proprietatilor specifice ceramicilor.
Keywords: statistics, ZTA properties, prediction, dopants
1. Multivariate analysis
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