# HW05: Decision Tree Regression solved

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## Description

In this homework, you will implement a decision tree regression algorithm in R, Matlab, or
Python. Here are the steps you need to follow:
1. You are given a univariate regression data set, which contains 133 data points, in the file
named hw05_data_set.csv. Divide the data set into two parts by assigning the first
100 data points to the training set and the remaining 33 data points to the test set.
2. Implement a decision tree regression algorithm using the following pre-pruning rule: If a
node has � or fewer data points, convert this node into a terminal node and do not split
further, where � is a user-defined parameter.
3. Learn a decision tree by setting the pre-pruning parameter � to 10. Draw training data
points, test data points, and your fit in the same figure. Your figure should be similar to
the following figure.
4. Calculate the root mean squared error for test data points. The formula for RMSE can be
written as:
RMSE = ‘∑ (�+ − �-+) 01231 /
+45
�7897
Your output should be similar to the following sentence.
RMSE is 27.6841 when P is 10
5. Learn decision trees by setting the pre-pruning parameter � to 1, 2, 3, …, 20. Draw
RMSE for test data points as a function of �. Your figure should be similar to the
following figure.
0 10 20 30 40 50 60
−100
−50
0
50
P = 10
x
y
training
test
What to submit: You need to submit your source code in a single file (.R file if you are using R,
.m file if you are using Matlab, or .py file if you are using Python) and a short report explaining
your approach (.doc, .docx, or .pdf file). You will put these two files in a single zip file named as
STUDENTID.zip, where STUDENTID should be replaced with your 7-digit student number.
How to submit: E-mail the zip file you created to aghanem15@ku.edu.tr with the subject line
Intro2MachineLearningHW05. Please follow the exact style mentioned for the subject line and
do not send a zip file named as STUDENTID.zip. Submissions that do not follow these