Self-directed project
Data Analytics and AI
Data Science · August 2026
A ProoV case study · educational project, not employment
Built an end-to-end demand analytics workflow on 9,648 historical transactions: performed EDA across sales, regions, products, and channels; transformed the data into a monthly time series; decomposed trend and seasonality; and compared a moving-average baseline, linear regression, and SARIMA using honest train/test evaluation. SARIMA delivered the strongest forecast accuracy and was translated into practical inventory and peak-season planning recommendations.
Graded against
- Exploratory Data Analysis20%
- Time-Series Analysis25%
- Forecasting Model Building35%
- Business Communication20%
Passed · pass mark 60/100
What stood out6
- Used a chronological 18/6 month split instead of a random split, avoiding leakage
- Compared three forecasting approaches and reported MAE, RMSE, and MAPE for each
- Applied seasonal decomposition and moving averages to explain trend and seasonality
- Connected the forecast results to inventory planning and peak-season strategy
- Leakage-Free Time-Series Splitting
- Comparative Forecast Evaluation
The work I submitted20 tasks
12 tasks · 10.5k characters · Python · 8 written answers · 604 words
- Setup Resource DeliveryPython · 999 characters
- Eda Code 1 LoadPython · 1.2k characters
- Eda Step 1 Load494 characters
- Eda Code 1 Describe1.5k characters
- Eda Step 1 Describe467 characters
- Eda Code 1 Timeseries879 characters
- Eda Step 1 Timeseries473 characters
- Eda Code 1 Regional1.1k characters
- Eda Step 1 Regional475 characters
- Eda Code 1 Product1.5k characters
- Ts Code 2 Resample960 characters
- Ts Step 2 Resample449 characters
- Setup Resource Delivery84 words
- Eda Code 1 Load90 words
- Eda Step 1 Load69 words
- Eda Code 1 Describe93 words
- Eda Step 1 Describe61 words
- Eda Code 1 Timeseries65 words
- Eda Step 1 Timeseries63 words
- Eda Code 1 Regional79 words
Summarised on purpose — the submitted code and writing stay private so this page cannot be reused as an answer key. The full submission sits behind the verified certificate.