We can see that with just six genes, we are able to predict the tissue type. Now let’s see if we can do even better with a random forest. Use the train function and the rf method to train a random...

We can see that with just six genes, we are able to predict the tissue type. Now let’s see if we can do even better with a random forest. Use the train function and the rf method to train a random forest. Try out values of mtry ranging from, at least, seq(50, 200, 25). What mtry value maximizes accuracy? To permit small nodesize to grow as we did with the classification trees, use the following argument: nodesize = 1. This will take several seconds to run. If you want to test it out, try using smaller values with ntree. Set the seed to 1990.