# Can we use KNN for classification?

## Can we use KNN for classification?

KNN also called K- nearest neighbour is a supervised machine learning algorithm that can be used for classification and regression problems.

How do I create an algorithm in Excel?

Create a simple formula in Excel

1. On the worksheet, click the cell in which you want to enter the formula.
2. Type the = (equal sign) followed by the constants and operators (up to 8192 characters) that you want to use in the calculation. For our example, type =1+1. Notes:
3. Press Enter (Windows) or Return (Mac).

### How do I find the nearest neighbor distance in Excel?

Get the X value of the row and subtract from the current row’s X value. Take the absolute value of this and add it to the corresponding value from the Y subtraction.

Is random forest better than KNN?

Is the decision based on the particular problem at hand or the power of the algorithm. I have used random forest,naive bayes and KNN on the same problem and found that random forest performs better than the other two,but I would like to distinctions about when to use which.

#### How do you create a classification tree in MATLAB?

To interactively grow a classification tree, use the Classification Learner app. For greater flexibility, grow a classification tree using fitctree at the command line….Create Classification Tree.

fitctree Fit binary decision tree for multiclass classification
prune Produce sequence of classification subtrees by pruning

How to train a kNN model?

For KNN, there is no model to be trained. For the hyperparameter k, we will use k=3, since the dataset is very small. The prediction phase consists of the following steps: For one given new observation, calculate the distance between this new observation and all the observations in the training dataset.

## How can KNN be used to find the discontinuity of a variable?

So from one quarter to its neighbor quarters, there can be a discontinuity of the variable. In this case, KNN can be used in this way: for each address in Paris, we find its nearest neighbors and calculate the average value. It will result in a more smoothed version for this target variable.

What is the difference between KNN and model tuning?

Then for KNN, there is only the step of hyperparameter tuning, which consists of finding the optimal hyperparameter k. For the model part, the principle of KNN is to use the whole dataset to find the k nearest neighbors. The Euclidean distance is often used.

### What is the basic principle of kNN?

For the model part, the principle of KNN is to use the whole dataset to find the k nearest neighbors. The Euclidean distance is often used. The prediction phase consists of