Fit with x and y

Funtion to fit with x and y

# S3 method for model_sslr
fit_xy(object, x = NULL, y = NULL, ...)

Arguments

object	is the model
x	is a data frame or matrix with train dataset without objective feature. X have labeled and unlabeled data
y	is objective feature with labeled values and NA values in unlabeled data
...	unused in this case