# Common Quantitative Trading Strategies: An Overview

Introduction

Quantitative trading, also known as quant trading, refers to investment strategies that use advanced mathematical models to identify and execute trading opportunities. This systematic approach relies heavily on algorithms, high-frequency trading, and big data to determine what, when, and how much to buy or sell. Quantitative trading strategies are commonly employed by hedge funds and institutional investors due to their analytical approach and potential for automation. This article will outline some of the most common quantitative trading strategies.

1. Mean Reversion Strategy

The mean reversion strategy is grounded in the assumption that high and low prices are temporary and that a security's price will tend to move to the average price over time. This strategy is usually implemented with statistical techniques such as standard deviation and z-score to quantify how far current prices are from the historical average. When the price deviates significantly from the mean, a quant trader would take a position expecting the price to revert to its mean.

1. Momentum Strategy

Also known as trend following, the momentum strategy is the practice of buying assets that have appreciated in price and selling those that have declined. This strategy is predicated on the belief that assets that have performed well in the past will continue to do so in the future, and vice versa. Momentum strategies often involve technical indicators such as moving averages, relative strength index (RSI), or MACD to determine trend direction and strength.

1. Statistical Arbitrage

Statistical arbitrage involves making trading decisions based on statistical models. It can be seen as a subset of mean reversion strategies. In a simple pair trading scenario, two highly correlated assets are identified. When they diverge—meaning one underperforms and the other outperforms—the underperforming asset is bought while the outperforming one is sold short. The expectation is that the relationship between the two assets will eventually return to its norm, resulting in profit.

1. Machine Learning/AI-based Strategies

With the advancement in computing power and data science, machine learning and AI-based strategies have gained popularity in quantitative trading. Machine learning algorithms can learn from and make decisions based on data. These strategies can involve techniques such as neural networks, reinforcement learning, or natural language processing to predict future price movements based on vast amounts of historical and real-time data.