Я работаю с данными 1500 строк с 22 переменными.
Я хотел бы использовать stepclass для выбора переменных. Тем не менее, мне сложно выбрать критерий.
stepclass(x, grouping, method, improvement = 0.05, maxvar = Inf,
start.vars = NULL, direction = c("both", "forward", "backward"),
criterion = "CR", fold = 10, cv.groups = NULL, output = TRUE,
min1var = TRUE, ...)
criterion:
CR Correctness Rate
AC Accuracy
AS Ability to Separate
CF Confidence
Details
• The correctness rate is the estimator for the correctness of a classification rule (1-error rate).
• The accuracy is based on the euclidean distances between (scaled) membership vectors and the
vectors representing the true class corner. These distances are standardized so that a measure
of 1 is achieved if all vectors lie in the correct corners and 0 if they all lie in the center.
• Analougously, the ability to seperate is based on the distances between (scaled) membership
vectors and the vector representing the corresponding assigned class corner.
• The confidence is the mean of the membership values of the assigned classes.
После проверки деталей в документах я не могу сказать, в чем разница между Точностью (A C) и Способность к разделению (AS) .
Что именно означают эти два?
Заранее спасибо!