Basic Concepts of Word Embedding
Word embedding is a method to represent words as vectors, where the words with similar meaning are identified with vectors similar to each other. This article gives a more thorough...
Adjacency Matrix in Graph Theory
There are several ways to represent the connections between vertices in a graph, one of those is the adjacency matrix. An adjacency matrix is a square matrix \(N \times N\)...
Autocorrelation: ACF and PACF
Autocorrelation function (ACF) is defined as the correlation of a signal \(S_t\) with a delayed copy as itself \(S_{t + k}\) as a function of delay where we’re measuring the...
Calculating and Validating Granger Causality
Granger causality is a statistical concept of causality where if a time series variable \(X\) Granger causes a time series variable \(Y\), then past values of \(X\) should contain information...
Autoregressive Model and Moving Average in Time Series Analysis
Time series analysis is the analysis of time series data, which is ordered by time and is collected in a fixed time intervals. The goal of time series analysis is...