k nearest neighbor regression function

Hi,

What is the k nearest neighbour regression function in matalb? Is only knn classification function available?

Regards

Farideh

[denny]

i want to find it too.

Answer 1

[wang guangyi]

i can not find it too

Answer 2

[Satadru Mukherjee]

clc

clear all

close all

x=input('Enter the x coordinates:');

y=input('Enter the y coordinates:');

z=[];

a=input('Enter the x coordinate of which , you want to predict the y value:');

k=input('Enter the k value:');

for i=1:length(x)

z=[z abs(x(i)-a)];%difference calculation

end

temp=0;

gemp=0;

for i=1:length(z)

for j=1:(length(z)-i)

if(z(j)>z(j+1))

temp=z(j);

z(j)=z(j+1);

z(j+1)=temp;

gemp=y(j);

y(j)=y(j+1);

y(j+1)=gemp;

end

end

end

tuka=0;

for i=1:k

tuka=tuka+y(i);

end

output=tuka/k

Answer 3

[Image Analyst]

Perhaps fitcknn()

[Satadru Mukherjee]

fitcknn is for classification , not for regression

Answer 4

[Bechir EL HOSNI]

Hi

KNN is a non parametric method used in machine learning.

We find two knid of KNN:

KNN classifier: Used in classification problem in which the ouput is a categorical variable.

KNN regression : Used in regression problem in which the output is a numerical variable.

In the context of regression problem we indentifie the first the K (Integer) nearest training points, to the observation we want to predict its output, and next we compute the average of the value of those points. The optimal value of K depend on the "Bias-Vriance tradeoff" ( a very important concept in statistic and machine learning).

Thanks.

Answer 5

[Elaheh Shamsi]

Hi

you can use this link to use KNN regression

https://www.sciencedirect.com/science/article/abs/pii/S1093326301001231

this paper uses one type of KNN regression to make the QSAR model.

good luck