Table 2 shows the initial set of variables and those that were retained in the final regression model.
The initial set of variables included tumour extent (T1, T2, T3, T4), nodal status (N0, N1, N2), distant disease (M0, M1), sex, tumour location (colon, rectum), age (in 5-year increments) and former neoadjuvant treatment (yes/no).
The method SANN requires an initial set of variables (sq) to be optimized over, a target function to be minimized (fn) and a function that generates a new candidate combination (gr) as well as control parameters such as the maximum number of iterations (maxit) and the starting temperature for the cooling schedule (temp).
From an initial set of 123 variables, GA selected 24 variables from the NHANES for use in predictive modeling of five-year mortality with machine learning techniques.
Through a factor analysis, an initial set of 48 variables was reduced to nine inputs to the model for predicting eight performance metrics as outputs of the model.
The initial set of independent variables at the patient level included sex, age, type of insurance (public or private), social deprivation (y/n, area defined by the local council), time of contact (day and evening versus night), number and type of presented problems, and traveling distance to the GP cooperative.
From the initial set of 31 gait variables, 16 were selected following a systematic procedure.
(Note that if variable selection is performed, the number of regression coefficients refers to the initial set of predictors, before variable selection).
The first stage involves the generation of an initial set of candidate secondary controlled variables and the generation of selection constraints that are used to determine if manipulated variables can be used for control of candidate controlled variables.
An initial set of 30 plausible predictor variables (half demographic or physiological, half structural) was reduced to 22 using phylogenetic trees.
Although our initial set of genotypes and environmental variables is limited, we believe that this and similar collections will soon be enlarged to provide a better capacity to map environmental adaptation.
