## How do you explain logistic regression to a child?

Logistic Regression, also known as Logit Regression or Logit Model, is a mathematical model used in statistics to estimate (guess) the probability of an event occurring having been given some previous data. Logistic Regression works with binary data, where either the event happens (1) or the event does not happen (0).

**What is logistic regression in research?**

Logistic regression is a statistical technique used in research designs that call for analyzing the relationship of an outcome or dependent variable to one or more predictors or independent variables when the dependent variable is either (a) dichotomous, having only two categories, for example, whether one uses illicit …

**What type of analysis is logistic regression?**

Like all regression analyses, the logistic regression is a predictive analysis. Logistic regression is used to describe data and to explain the relationship between one dependent binary variable and one or more nominal, ordinal, interval or ratio-level independent variables.

### Who created logistic regression?

Pierre0François Verhulst

**What is difference between linear and logistic regression?**

Linear regression is used to predict the continuous dependent variable using a given set of independent variables. Logistic Regression is used to predict the categorical dependent variable using a given set of independent variables. Linear Regression is used for solving Regression problem.

**Why is logistic regression better?**

Logistic regression is easier to implement, interpret, and very efficient to train. If the number of observations is lesser than the number of features, Logistic Regression should not be used, otherwise, it may lead to overfitting. It makes no assumptions about distributions of classes in feature space.

#### What is the main purpose of logistic regression?

Logistic regression analysis is used to examine the association of (categorical or continuous) independent variable(s) with one dichotomous dependent variable. This is in contrast to linear regression analysis in which the dependent variable is a continuous variable.

**Should I use linear or logistic regression?**

Linear Regression is used to handle regression problems whereas Logistic regression is used to handle the classification problems. Linear regression provides a continuous output but Logistic regression provides discreet output.

**Is logistic regression biased?**

Parameters for logistic regression are well known to be biased in small samples, but the same bias can exist in large samples if the event is rare.

## What is bias in logistic regression?

Logistic regression predictions should be unbiased. That is: “average of predictions” should ≈ “average of observations” Prediction bias is a quantity that measures how far apart those two averages are. That is: prediction bias = average of predictions − average of labels in data set.

**What is a bias term?**

Bias Term. The Bias term is a parameter that allows models to represent patterns that do not pass through the origin. The bias term is intrinsic to the data and needs to be incorporated into the descriptive model in order to get the expected results.

**What is bias term in machine learning?**

bias is an error from erroneous assumptions in the learning algorithm. High bias can cause an algorithm to miss the relevant relations between features and target outputs (underfitting).” Bias is the accuracy of our predictions. A high bias means the prediction will be inaccurate.

### What is weight in deep learning?

Weight is the parameter within a neural network that transforms input data within the network’s hidden layers. A neural network is a series of nodes, or neurons. Within each node is a set of inputs, weight, and a bias value.

**What is weight and bias in deep learning?**

Weights and biases (commonly referred to as w and b) are the learnable parameters of a machine learning model. When the inputs are transmitted between neurons, the weights are applied to the inputs along with the bias. A neuron. Weights control the signal (or the strength of the connection) between two neurons.

**What are the different activation functions?**

Types of Activation Functions

- Sigmoid Function. In an ANN, the sigmoid function is a non-linear AF used primarily in feedforward neural networks.
- Hyperbolic Tangent Function (Tanh)
- Softmax Function.
- Softsign Function.
- Rectified Linear Unit (ReLU) Function.
- Exponential Linear Units (ELUs) Function.

#### Which activation function is the most commonly used?

ReLU Hidden Layer Activation Function The rectified linear activation function, or ReLU activation function, is perhaps the most common function used for hidden layers.

**What is activation function and its types?**

An activation function is a very important feature of an artificial neural network , they basically decide whether the neuron should be activated or not. In artificial neural networks, the activation function defines the output of that node given an input or set of inputs.

**Which activation function is best?**

Choosing the right Activation Function

- Sigmoid functions and their combinations generally work better in the case of classifiers.
- Sigmoids and tanh functions are sometimes avoided due to the vanishing gradient problem.
- ReLU function is a general activation function and is used in most cases these days.

## What is the difference between ReLU and sigmoid activation function?

Efficiency: ReLu is faster to compute than the sigmoid function, and its derivative is faster to compute. This makes a significant difference to training and inference time for neural networks: only a constant factor, but constants can matter. Simplicity: ReLu is simple.

**Is Softmax an activation function?**

The softmax function is used as the activation function in the output layer of neural network models that predict a multinomial probability distribution. Softmax units naturally represent a probability distribution over a discrete variable with k possible values, so they may be used as a kind of switch.

**What is a Softmax layer?**

The softmax function is a function that turns a vector of K real values into a vector of K real values that sum to 1. Many multi-layer neural networks end in a penultimate layer which outputs real-valued scores that are not conveniently scaled and which may be difficult to work with.

### What is fully connected layer?

Fully Connected Layer is simply, feed forward neural networks. Fully Connected Layers form the last few layers in the network. The input to the fully connected layer is the output from the final Pooling or Convolutional Layer, which is flattened and then fed into the fully connected layer.