Are you delving into the world of data science and looking forward to mastering algorithms? Whether you aim to build a career in data science or wish to expand your skill set in the related field, learning algorithms are integral to data science and machine learning.
Algorithm is the buzzword in the field of data science. By employing machine learning models, data scientists can use these tools to automate complex and mundane data processes. Different algorithms in data science, like Linear Regression, Logistic Regression, Naive Bayes, K-nearest neighbors, etc., have different applications and purposes. While some help to make predictions, some are best for data collection and classification.
Must-Know Data Science Algorithms for a Successful Data Scientist Career
There are numerous algorithms that make data science projects easier and more efficient. Here, we jot down the list of top algorithms for data science.
Linear regression is one of the top and most well-known algorithms in statistics and machine learning. Linear regression is an equation that establishes a relationship between the input and output variables. The same calculates the input variables’ weightings, also known as coefficients. While using this technique, ensure to remove correlated or similar variables and data noise.
One of the techniques extensively used in machine learning and statistics is Logistic regression. This technique is used for binary classification problems. Like linear regression, this algorithm aims to find the coefficient values that weigh the input variable. However, it transforms the output using a logistic function. The logistic function can transform a value between 0 to 1. To use logistic regression, ensure the elimination of unrelated and correlated attributes to the output variable.
An important type of algorithm, this tool is used for creating classifications and predictions. There is one centrally available data, and its nodes follow a certain pathway to generate multiple results. The decision tree begins with a specific node and then branches off into another category, which again branches down into other statistics. The decision tree is often used to find the latest health status according to different data points. Each node represents an input variable and a split point. Trees are accurate, fast to learn, need no advance preparation, and make predictions for a broad range of problems.
The KNN algorithm is best known for its simplicity and efficiency. Data scientists use this tool for classification and regression analysis. KNN algorithms search the data to find the k value and similar ones. It predicts k based on the instances, which is determined by different knowledge measures for Euclidean distance, Hamming distance, etc. This distance depends on the data scale and dimensionality. Understand the data well before selecting the type of measure and then establish a medium value of k for an accurate result.
What if you have more than two classes? Linear discriminant analysis algorithm is for such linear classification. Also called LDA, this algorithm contains statistical data properties measured for each class. It contains a mean value for a class and the variance for all the classes. To make predictions, calculate a discriminant value for the class. Then, the prediction is made with the largest value.
Naive Bayes is an easy and powerful algorithm that can enhance data scientist skills. This model comprises two probabilities – class probability and conditional probability. It uses the probability model to generate predictions for new data according to the Bayes Theorem. It assumes that the data has a bell curve. Naive Bayes assumes that input variables are independent.
Support Vector Machine
SVM is a supervised machine learning algorithm that handles classification and regression problems using a hyperplane. This algorithm plots all the data items on a n-dimensional graph and then finds the hyperplane to separate the two classes. It is crucial to select the correct hyperplane that offers maximum margin.
Which algorithm should one use? It will depend on factors like data size, data quality, data nature, deadline, need, objective, etc. Even veteran data scientists use different algorithms to identify the best one in that use case. Some of these algorithms have been present for centuries. The same has been intensely studied and used by the data scientists. The ones listed above are the fastest and easiest. Don’t miss trying these algorithms.
Receiving your data science certification will help you to advance in your career quickly. Due to the many applications of data science algorithms, there is a great demand for data science professionals, and it offers a bright career in future.