Freaks City

Data Ingestion and Temporal Structuring Quarterly population shift records spanning from September 1971 to June 1993 are imported and converted into a formal time series object. The dataset is structured with a quarterly frequency to align with the observation intervals. raw_values <- read.table("quarterly_population.dat")$V1 demog ...

Data Preparation The dataset originates from a Kaggle competition involving store item demand forecasting. It contains 5 years of sales data (2013-2017) for 50 items across 10 stores, requiring predictions for the next 3 months (January-March 2018). This represents a multi-step multivariate time series problem with 500 distinct time series to f ...

Start by loading the data from an Excel file named data.xlsx containing a single numeric column Value. The code splits the series into an 80% training segment and reserves the remainder for testing. % Clear workspace and figures clc; clear; close all; % Control parameters forceManual = 1; % 1 = use fixed ARIMA(2,1,1); 0 = auto-order selec ...