Stratified sampling is a type of probability sampling in which the population is divided into strata and a simple random sample is taken from each stratum. This type of sampling is used when the population is heterogeneous and the researcher wants to ensure that all strata are represented in the sample.
Definition of Universality Universality: Universality is the property of being applicable to a class of objects or phenomena. In data science, this means that a model or algorithm can be used to solve a problem for a wide range of data sets. This makes universality an important property for any data science toolkit.
Bivariate Analysis is the examination of two sets of data, typically in order to identify any correlations between them. This can be used to inform further analysis, or to gain a better understanding of the data…
Definition of Resampling Resampling: Resampling is a technique used in data science to create new datasets from existing ones. It involves selecting a subset of the data to be used in the new dataset, and then randomly selecting samples from that subset. This process is repeated multiple times to create a new dataset that is…
Definition of Poisson Distribution The Poisson distribution is a discrete probability distribution that models the number of events that occur in a given time interval. The Poisson distribution is often used to model the number of clicks on a website, the number of phone calls received, or the number of emails sent in a given…
Definition of Naive Bayes Classifier A naive Bayes classifier is a machine learning algorithm that relies on the assumption that the features of a given object are independent of each other. This algorithm is often used for text classification tasks, such as sorting email into spam and non-spam folders.
Definition of R-squared R-squared: R-squared is a statistic that measures how close the data points in a set are to a regression line (how well a model fits the data). It is a number between 0 and 1, with 1 indicating a perfect correlation and 0 indicating no correlation at all. It is calculated by…