Cross Validation

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is not a machine learning algorithm?
SVG
SVM
Random forest
None of the mentioned
Explanation:
SVM stands for scalable vector machine.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following can be used to create the most common graph types?
qplot
quickplot
plot
all of the mentioned
Explanation:
qplot() is short for a quick plot.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
For k cross-validation, smaller k value implies less variance.
True
False
Explanation:
Larger k value implies more variance.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is a categorical outcome?
RMSE
RSquared
Accuracy
All of the mentioned
Explanation:
RMSE stands for Root Mean Squared Error.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which of the following method is used for trainControl resampling?
repeatedcv
svm
bag32
none of the mentioned
Explanation:
repeatedcv stands for repeated cross-validation.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is correct use of cross validation?
Selecting variables to include in a model
Comparing predictors
Selecting parameters in prediction function
All of the mentioned
Explanation:
Cross-validation is also used to pick type of prediction function to be used.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
For k cross-validation, larger k value implies more bias.
True
False
Explanation:
For k cross-validation, larger k value implies less bias.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is a common error measure?
Sensitivity
Median absolute deviation
Specificity
All of the mentioned
Explanation:
Sensitivity and specificity are statistical measures of the performance of a binary classification test, also known in statistics as classification function.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Point out the wrong statement.
ROC curve stands for receiver operating characteristic
Foretime series, data must be in chunks
Random sampling must be done with replacement
None of the mentioned
Explanation:
Random sampling with replacement is the bootstrap.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Point out the wrong combination.
True negative=correctly rejected
False negative=correctly rejected
False positive=correctly identified
All of the mentioned
Explanation:
False positive means incorrectly identified.