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Update page 'Questions concerning R language'

xuanyi.wang
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Questions concerning R language.md
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***Applied Question*** ***Applied Question***
This problem involves the `OJ` data set which is part of the `ISLR` package. This problem involves the `OJ` data set which is part of the `ISLR` package.
> i. Create a training set containing a random sample of 800 observations, and a test set containing the remaining observations. * i. Create a training set containing a random sample of 800 observations, and a test set containing the remaining observations.
> ii. Fit a support vector classifier to the training data using `cost=0.01`, with `Purchase` as the response and the other variables as predictors. Use the `summary()` function to produce summary statistics, and describe the results obtained. * ii. Fit a support vector classifier to the training data using `cost=0.01`, with `Purchase` as the response and the other variables as predictors. Use the `summary()` function to produce summary statistics, and describe the results obtained.
> iii. What are the training and test error rates? * iii. What are the training and test error rates?
> iv. Use the `tune()` function to select an optimal cost. Consider values in the range 0.01 to 10. * iv. Use the `tune()` function to select an optimal cost. Consider values in the range 0.01 to 10.
> v. Compute the training and test error rates using this new value for `cost`. * v. Compute the training and test error rates using this new value for `cost`.
> vi. Repeat parts (ii) through (v) using a support vector machine with a radial kernel. Use the default value for `gamma`. * vi. Repeat parts (ii) through (v) using a support vector machine with a radial kernel. Use the default value for `gamma`.
> vii. Repeat parts (ii) through (v) using a support vector machine with a polynomial kernel. Set `degree=2`. * vii. Repeat parts (ii) through (v) using a support vector machine with a polynomial kernel. Set `degree=2`.
> viii. Overall, which approach seems to give the best results on this data? * viii. Overall, which approach seems to give the best results on this data?
***Conceptual Question*** ***Conceptual Question***