Influential Factors on California Regional Housing Price Analysed by Multiple Linear Regression

While metropolises keep expanding with the increasing population in recent decades, the need for housing rises inevitably. This paper aims to find the most explanatory factors for the housing price in California; with 20433 entries of data found in Kaggle, the method of multiple linear regression (MLR) is applied to find the most influential factors. 500 entries in the dataset are chosen randomly and are divided into 2 datasets for training and testing purposes. Models have been developed in R by using the training dataset. After comparing the adjusted R square and variability of the models, the most convincible model will be selected to find out the result of this investigation on the test dataset. After model diagnostics, the result of this analysis is that the regional median income level has a strong positive correlation with the housing price, and it is the most influential factor. Other influential factors will be introduced in the conclusion.