The tools of data mining and machine learning algorithms are vast. Many different algorithms are used to sort information, predict information, and draw lines. They can make sense of millions of data points and create elaborate outputs in a fraction of a second. One of the most helpful examples of these algorithms is the logistic regression tool. The logistic regression algorithm is able to classify, predict, and draw a curve instead of the line used in linear regression and other machine learning algorithms. Using logistic regression can be a helpful way of making sense of massive amounts of data and visualizing that data onto a simple curve that charts changes over time.
Logistic Regression Algorithm Defined
A logistic regression algorithm is a machine learning regression algorithm which measures the ways in which a set of data conforms to two particular variables. The algorithm dictates the variables, the relationship, and the ways in which the variables interact. The most common form of a logistic regression algorithm is a binomial algorithm. This form of the algorithm has two particular outputs which can result from the function. The algorithm places the data set into one of these areas and then maps changes in the data set over time. This map represents a curve that displays the relationships inherent in the data set. There are also more complicated forms of logistic regression that display multiple variables.
Logistic regression is different from linear regression in that it represents a curve with a changing slope. Linear regression is more fixed and unchanging. It is more focused on drawing a line that fits the means of a data set than drawing a curve which reflects the relationship between variables. This process of logistic regression is not only applicable to an existing data set. It may also be used to predict future behavior.
Forms of Machine Learning
Like many other forms of machine learning, a logistic regression algorithm requires a machine learning architecture in order to function. Architectures are vast and have as their only requirement the ability to change and improve over time. The most common architecture for artificial intelligence is an artificial neural network. The neural network can be used to mimic the learning of the human brain with numerous nodes that are connected. Each node is given a specific task or variable to process.
Then, the weights of different nodes change based on the purpose of the machine learning approach. In a logistic regression algorithm, there may be a node with a function that determines one category for variable and another node for the other category. There are also multinomial equations where each variable may be represented on a different note. The algorithm can change those nodes significantly to create different results.
There are multiple ways to engage in the learning that can utilize a logistic regression algorithm. One of these is through supervised learning. In supervised learning, the machine learning algorithm works from an example set. The algorithm goes through hundreds or thousands of cycles in order to get within a margin of error to a particular set.
Regression Algorithm Signifiers
For logistic regression algorithms, the example set is a list of signifiers that attach either a 0 or a 1 to a random variable. The goal for the machine learning algorithm is to classify each data point correctly and then to plot the products. It is a relatively simple form of machine learning because of the basic outputs. However, a system may require many different points and weights changing in order to achieve the desired outcome.
The other most common approach is within unsupervised learning. Unsupervised learning is for situations when the artificial intelligence designer wants more freedom for the algorithm and the machine to work. He or she does not want a simple reproduction of an example set. Rather, they want to see if the machine learning algorithm can produce a result which was outside of the original parameters of an example set.
With logistic regression, the machine learning algorithm would use unsupervised learning to attach their own binomial classifiers to each piece of data. The resulting function would be of the relationship that the algorithm believed was the most relevant for the data. The algorithm could then be tested with new pieces of information and data in order to figure out how successful the algorithm was.
Logistic Regression Algorithm Uses
There are many different uses of logistic regression. One of these is prediction. Logistic regression is helpful for predicting the ways in which different variables will interact with each other over a period of time. It is helpful especially when those variables do not interact with each other in a linear way. Many variables change their relationship based on circumstances and threshold levels.
The slope of a line may change widely. It may be in a bell curve where the most data points are within a set distribution. Another use is visualization. Visualizing a large set of data which spans two wide variables can be challenging. The data may have numerous outliers and an unclear relationship to each variable. Logistic regression packs the data points and the variables together and displays that relationship with a smooth curve. Visualization helps operators discover new facts about a data set and then possibly submit the data set to other algorithms.
Thoughts on Logistic Regression
The specific aspects of logistic regression may seem complicated. They require a considerable amount of statistics and mathematical knowledge. However, they are helpful when applied to real-world situations and visualized on a plot. While some machine learning algorithms stay abstract and cannot be explained, a logistic regression algorithm can make sense of even the most basic data and visualize that data for users and customers to see.