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CON-2301: tackle issues in ai branch time-series #2303

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CON-2301: tackle issues in ai branch time-series #2303

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29 changes: 18 additions & 11 deletions subjects/ai/time-series/README.md
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Expand Up @@ -21,6 +21,7 @@ Time series a used A LOT in finance. You'll learn to evaluate financial strategi
- Python 3.x
- NumPy
- Pandas
- Plotly
- Jupyter or JupyterLab

_Version of Pandas I used to do the exercises: 1.0.1_.
Expand All @@ -36,6 +37,8 @@ I suggest to use the most recent one.

- https://towardsdatascience.com/different-ways-to-iterate-over-rows-in-a-pandas-dataframe-performance-comparison-dc0d5dcef8fe

- Datafile [`AAPL.csv`](data/AAPL.csv)

---

---
Expand All @@ -44,13 +47,13 @@ I suggest to use the most recent one.

The goal of this exercise is to set up the Python work environment with the required libraries.

**Note:** For each quest, your first exercice will be to set up the virtual environment with the required libraries.
**Note:** For each quest, your first exercise will be to set up the virtual environment with the required libraries.

I recommend to use:

- the **last stable versions** of Python.
- the virtual environment you're the most confortable with. `virtualenv` and `conda` are the most used in Data Science.
- one of the most recents versions of the libraries required
- the virtual environment you're the most comfortable with. `virtualenv` and `conda` are the most used in Data Science.
- one of the most recent versions of the libraries required

1. Create a virtual environment named `ex00`, with a version of Python >= `3.8`, with the following libraries: `pandas`, `numpy` and `jupyter`.

Expand All @@ -72,19 +75,23 @@ The goal of this exercise is to learn to manipulate time series in Pandas.

# Exercise 2: Financial data

The goal of this exercise is to learn to use Pandas on Time Series an on Financial data.
This exercise aims to familiarize you with handling financial data using Pandas, particularly focusing on time series analysis and computations related to stock prices.

The data we will use is Apple stock.

1. Using `Plotly` plot a Candlestick
1. Before performing specific tasks, ensure your data is preprocessed adequately. Check for missing values, convert string dates to datetime objects, and set the date column as the index. This step ensures a clean dataset for subsequent operations.

2. Use `Plotly` to generate a candlestick chart based on the provided Apple stock data. Ensure the plot includes Open, High, Low, and Close prices. The date column should be set as the index (formatted as datetime).

3. Aggregate the data to **last business day of each month** using Pandas. The aggregation should consider the meaning of the variables. How many months are in the considered period ?

2. Aggregate the data to **last business day of each month**. The aggregation should consider the meaning of the variables. How many months are in the considered period ?
4. When comparing many stocks between them the metric which is frequently used is the return of the price. The price is not a convenient metric as the prices evolve in different ranges. The return at time t is defined as

3. When comparing many stocks between them the metric which is frequently used is the return of the price. The price is not a convenient metric as the prices evolve in different ranges. The return at time t is defined as
- `(Price(t) - Price(t-1))/ Price(t-1)`

- (Price(t) - Price(t-1))/ Price(t-1)
Compute **daily returns** based on the Open price without using a for loop.

Using the open price compute the **daily return**. Propose two different ways **without for loop**.
There are two recommended methods: utilizing the `pct_change` function and implementing a vectorized approach using the provided formula.

---

Expand Down Expand Up @@ -131,8 +138,8 @@ The goal of this exercise is to learn to perform a backtest in Pandas. A backtes

We will backtest a **long only** strategy on Apple Inc. Long only means that we only consider buying the stock. The input signal at date d says if the close price will increase at d+1. We assume that the input signal is available before the market closes.

1. Drop the rows with missing values and compute the daily futur return on the Apple stock (`AAPL.csv`) on the adjusted close price. The daily futur return means: **Return(t) = (Price(t+1) - Price(t))/Price(t)**.
There are some events as splits or dividents that artificially change the price of the stock. That is why the close price is adjusted to avoid to have outliers in the price data.
1. Drop the rows with missing values and compute the daily future return on the Apple stock [`AAPL.csv`](data/AAPL.csv) on the adjusted close price. The daily future return means: **Return(t) = (Price(t+1) - Price(t))/Price(t)**.
There are some events as splits or dividends that artificially change the price of the stock. That is why the close price is adjusted to avoid to have outliers in the price data.

2. Create a Series that contains a random boolean array with **p=0.5**

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4 changes: 3 additions & 1 deletion subjects/ai/time-series/audit/README.md
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Expand Up @@ -85,7 +85,9 @@ To get this result there are two ways: `resample` and `groupby`. There are two k
- Find how to affect the aggregation on the last **business** day of each month. This is already implemented in Pandas and the keyword that should be used either in `resample` parameter or in `Grouper` is `BM`.
- Choose the right aggregation function for each variable. The prices (Open, Close and Adjusted Close) should be aggregated by taking the `mean`. Low should be aggregated by taking the `minimum` because it represents the lower price of the day, so the lowest price on the month is the lowest price of the lowest prices on the day. The same logic applied to High, leads to use the `maximum` to aggregate the High. Volume should be aggregated using the `sum` because the monthly volume is equal to the sum of daily volume over the month.

###### For question 3, does it not involve a for loop and is the output as below? The first way to do it is to compute the return without for loop is to use `pct_change`. And the second way to do it is to implement the formula given in the exercise in a vectorized way. To get the value at `t-1` the data has to be shifted with `shift`.
###### For question 3, does it not involve a for loop and is the output as below?

The first way to do it is to compute the return without for loop is to use `pct_change`. And the second way to do it is to implement the formula given in the exercise in a vectorized way. To get the value at `t-1` the data has to be shifted with `shift`.

```console
Date
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