## What is R train function?

train can be used to tune models by picking the complexity parameters that are associated with the optimal resampling statistics. By default, the function createGrid is used to define the candidate values of the tuning parameters. The user can also specify their own.

What tuning parameters exist for the method ranger from the library Caret?

By default, the train function without any arguments re-runs the model over 25 bootstrap samples and across 3 options of the tuning parameter (the tuning parameter for ranger is mtry ; the number of randomly selected predictors at each cut in the tree).

How does the train function?

How does an electric train work? Many trains operate solely on electrical power. They get the electricity from a third rail, or electrical line, which is present along the track. Transformers transfer the voltage from the lines, and the electrical current enables the motors on the wheels to move.

### What is the use of trainControl () method?

5.5. 4 The trainControl Function. The function trainControl generates parameters that further control how models are created, with possible values: method : The resampling method: “boot” , “cv” , “LOOCV” , “LGOCV” , “repeatedcv” , “timeslice” , “none” and “oob” .

What is the caret package in R?

The caret package (short for Classification And REgression Training) contains functions to streamline the model training process for complex regression and classification problems.

Which method is used for trainControl resampling?

8. Which of the following method is used for trainControl resampling? Explanation: repeatedcv stands for repeated cross-validation.

#### What is CV in caret?

with tuneLength you let caret to choose 10 different values (total) amongst all the different parameters you can use for a particular model. …

What is MTRY in randomForest?

mtry: Number of variables randomly sampled as candidates at each split. ntree: Number of trees to grow.

What keeps a train on the track?

The wheels on each side of a train car are connected with a metal rod called an axle. This axle keeps the two train wheels moving together, both turning at the same speed when the train is moving. This construction is great for straight tracks. The outside line of the track should be longer than the inside line.

## How does a train start moving?

The static frictional force on the train is between the wheels and the track. The frictional force on the cars is between the axle and the wheels (so, I cheated a little bit here). Once a car is moving, the axle-wheel interaction changes to kinetic friction with a lower coefficient.

How do you type a caret?

Creating the ^ symbol on a U.S. keyboard To create the caret symbol using a U.S. keyboard hold down the Shift and press the 6 number key at the top of the keyboard.