Dependent variables believed to contribute to a likelihood of falling are analyzed using a latent class analysis. The polynomial calculation unit expands the input value of the variable to the same number as a number of a coefficient corresponding to one group so that the process in units of the groups is enabled before the calculation is executed. Each aircraft also has a fuselage that folds around a lateral axis. An osseo classification and digital tomosynthesis method includes the steps of moving a pair of sensorreceptor units relative to a patient.