Three treatments were performed for a cell area and five thicknesses of layers (Fig. ). Dummy vectorization treats area and thicknesses as qualitative variables and encodes them into binary vectors. When treating area and thicknesses as quantitative, values delimited by the vertical bar were summed up, and the missing values were complemented by zero or median (Fig. ). Other columns were vectorized into dummy variables due to the difficulty of numerical manipulation, even for columns of time and temperature.