How to perform a classification or regression using k-NN?

Thu, 27 Jun 2019 02:54:42 +0000

Suppose, you have given the following dataset where x and y are the 2 features and color Red or Blue is the target variable.

a) A new data point $x=1$ and $y=1$ is given. Using Euclidean distance in 3-NN, what you predict as the color for this data point?

Dataset
x	y	Color
-1	1	Red
0	1	Blue
0	2	Red
1	-1	Red
1	0	Blue
1	2	Blue
2	2	Red
2	3	Blue

b) Now assume we have the following dataset and the target value is the price. A new data point $x=1$ and $y=1$ is given. Using Euclidean distance in 3-NN. What would be the estimated price?

Dataset
x	y	Price
-1	1	$100
0	1	$50
0	2	$20
1	-1	$40
1	0	$30
1	2	$40
2	2	$70
2	3	$30

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How to perform a classification or regression using k-NN?