Datasets

Follow these steps to subscribe to an Equity security:

1. Load the assembly files and data types in their own cell.

#load "../Initialize.csx"

2. Import the data types.

#load "../QuantConnect.csx"
#r "../Microsoft.Data.Analysis.dll"

using QuantConnect;
using QuantConnect.Data;
using QuantConnect.Algorithm;
using QuantConnect.Research;
using QuantConnect.Indicators;
using QuantConnect.Data.Fundamental;
using Microsoft.Data.Analysis;

3. Create a QuantBook.

var qb = new QuantBook();

qb = QuantBook()

4. Call the AddEquityadd_equity method with a ticker and then save a reference to the Equity Symbol.

var symbols = new [] 
{
    "AAL",  // American Airlines Group, Inc.
    "ALGT", // Allegiant Travel Company
    "ALK",  // Alaska Air Group, Inc.
    "DAL",  // Delta Air Lines, Inc.
    "LUV",  // Southwest Airlines Company
    "SKYW", // SkyWest, Inc.
    "UAL"   // United Air Lines
}
.Select(ticker => qb.AddEquity(ticker, Resolution.Daily).Symbol);

symbols = [
    qb.add_equity(ticker, Resolution.DAILY).symbol
    for ticker in [
        "AAL",   # American Airlines Group, Inc.
        "ALGT",  # Allegiant Travel Company
        "ALK",   # Alaska Air Group, Inc.
        "DAL",   # Delta Air Lines, Inc.
        "LUV",   # Southwest Airlines Company
        "SKYW",  # SkyWest, Inc.
        "UAL"    # United Air Lines
    ]
]

You need a subscription before you can request historical fundamental data for US Equities. On the time dimension, you can request an amount of historical data based on a trailing number of bars, a trailing period of time, or a defined period of time. On the security dimension, you can request historical data for a single US Equity, a set of US Equities, or all of the US Equities in the US Fundamental dataset. On the property dimension, you can call the Historyhistory method to get all fundamental properties.

When you call the Historyhistory method, you can request Fundamental or Fundamentals objects. If you use Fundamental, the method returns all fundamental properties for the Symbol object(s) you provide. If you use Fundamentals, the method returns all fundamental properties for all the US Equities in the US Fundamental dataset that were trading during that time period you request, including companies that no longer trade.

Trailing Number of Trading Days

To get historical data for a number of trailing trading days, call the Historyhistory method with the number of trading days. If you didn't use Resolution.DailyResolution.DAILY when you subscribed to the US Equities, pass it as the last argument to the Historyhistory method.

// Fundamental objects
var singleFundamentalHistory = qb.History<Fundamental>(symbols.First(), 10);
var setFundamentalHistory = qb.History<Fundamental>(symbols, 10);
var allFundamentalHistory = qb.History<Fundamental>(qb.Securities.Keys, 10);
    
// Fundamentals objects
var allFundamentalsHistory = qb.History<Fundamentals>(qb.Securities.Keys, 10);

# DataFrame of fundamental data
single_fundamental_df = qb.history(Fundamental, symbols[0], 10)
set_fundamental_df = qb.history(Fundamental, symbols, 10)
all_fundamental_df = qb.history(Fundamental, qb.securities.keys(), 10)
all_fundamentals_df = qb.history(Fundamentals, 10)

# Fundamental objects
single_fundamental_history = qb.history[Fundamental](symbols[0], 10)
set_fundamental_history = qb.history[Fundamental](symbols, 10)
all_fundamental_history = qb.history[Fundamental](qb.securities.keys(), 10)

# Fundamentals objects
all_fundamentals_history = qb.history[Fundamentals](qb.securities.keys(), 10)

The preceding calls return fundamental data for the 10 most recent trading days.

Trailing Period of Time

To get historical data for a trailing period of time, call the Historyhistory method with a TimeSpantimedelta object.

// Fundamental objects
var singleFundamentalHistory = qb.History<Fundamental>(symbols.First(), TimeSpan.FromDays(10));
var setFundamentalHistory = qb.History<Fundamental>(symbols, TimeSpan.FromDays(10));
var allFundamentalHistory = qb.History<Fundamental>(qb.Securities.Keys, TimeSpan.FromDays(10));
    
// Fundamentals objects
var allFundamentalsHistory = qb.History<Fundamentals>(TimeSpan.FromDays(10));

# DataFrame of fundamental data
single_fundamental_df = qb.history(Fundamental, symbols[0], timedelta(days=10))
set_fundamental_df = qb.history(Fundamental, symbols, timedelta(days=10))
all_fundamental_df = qb.history(Fundamental, qb.securities.keys(), timedelta(days=10))
all_fundamentals_df = qb.history(Fundamentals, timedelta(5))

# Fundamental objects
single_fundamental_history = qb.history[Fundamental](symbols[0], timedelta(days=10))
set_fundamental_history = qb.history[Fundamental](symbols, timedelta(days=10))
all_fundamental_history = qb.history[Fundamental](qb.securities.keys(), timedelta(days=10))

# Fundamentals objects
all_fundamentals_history = qb.history[Fundamentals](timedelta(days=10))

The preceding calls return fundamental data for the most recent trading days.

Defined Period of Time

To get the historical data of all the fundamental properties over specific period of time, call the Historyhistory method with a start DateTimedatetime and an end DateTimedatetime. To view the possible fundamental properties, see the Fundamental attributes in Data Point Attributes. The start and end times you provide to these methods are based in the notebook time zone.

var startDate = new DateTime(2021, 1, 1);
var endDate = new DateTime(2021, 2, 1);

// Fundamental objects
var singleFundamentalHistory = qb.History<Fundamental>(symbols.First(), startDate, endDate);
var setFundamentalHistory = qb.History<Fundamental>(symbols, startDate, endDate);
var allFundamentalHistory = qb.History<Fundamental>(qb.Securities.Keys, startDate, endDate);
    
// Fundamentals objects
var allFundamentalsHistory = qb.History<Fundamentals>(qb.Securities.Keys, startDate, endDate);

start_date = datetime(2021, 1, 1)
end_date = datetime(2021, 2, 1)

# DataFrame of all fundamental properties
single_fundamental_df = qb.history(Fundamental, symbols[0], start_date, end_date)
set_fundamental_df = qb.history(Fundamental, symbols, start_date, end_date)
all_fundamental_df = qb.history(Fundamental, qb.securities.keys(), start_date, end_date)
all_fundamentals_df = qb.history(Fundamentals, start_date, end_date)

# Fundamental objects
single_fundamental_history = qb.history[Fundamental](symbols[0], start_date, end_date)
set_fundamental_history = qb.history[Fundamental](symbols, start_date, end_date)
all_fundamental_history = qb.history[Fundamental](qb.securities.keys(), start_date, end_date)

# Fundamentals objects
all_fundamentals_history = qb.history[Fundamentals](qb.securities.keys(), start_date, end_date)

The preceding method returns the fundamental property values that are timestamped within the defined period of time.

You need some historical data to perform wrangling operations. To display pandas objects, run a cell in a notebook with the pandas object as the last line. To display other data formats, call the print method.

You need some historical data to perform wrangling operations. Use LINQ to wrangle the data and then call the Console.WriteLine method in a Jupyter Notebook to display the data.

DataFrame Objects

The Historyhistory method returns a multi-index DataFrame where the first level is the Equity Symbol and the second level is the EndTimeend_time of the trading day. The columns of the DataFrame are the names of the fundamental properties. The following image shows the first 4 columns of an example DataFrame:

Fundamental Objects

If you pass a Symbol to the history[Fundamental]History<Fundamental> method, run the following code to get the fundamental properties over time:

for fundamental in single_fundamental_history:
    symbol = fundamental.symbol
    end_time = fundamental.end_time
    pe_ratio = fundamental.valuation_ratios.pe_ratio

foreach (var fundamental in singleFundamentalHistory) // Iterate trading days
{
    var endTime = fundamental.EndTime;
    var peRatio = fundamental.ValuationRatios.PERatio;
}

If you pass a list of Symbol objects to the history[Fundamental]History<Fundamental> method, run the following code to get the fundamental properties over time:

for fundamental_dict in set_fundamental_history: # Iterate trading days
    for symbol, fundamental in fundamental_dict.items(): # Iterate Symbols
        end_time = fundamental.end_time
        pe_ratio = fundamental.valuation_ratios.pe_ratio

foreach (var fundamentalDict in setFundamentalHistory) // Iterate trading days
{
    foreach (var kvp in fundamentalDict) // Iterate Symbols
    {
        var symbol = kvp.Key;
        var fundamental = kvp.Value;
        var endTime = fundamental.EndTime;
        var peRatio = fundamental.ValuationRatios.PERatio;
    }
}

Fundamentals Objects

If you request all fundamental properties for all US Equities with the history[Fundamentals]History<Fundamentals> method, run the following code to get the fundamental properties over time:

for fundamentals_dict in all_fundamentals_history: # Iterate trading days
    fundamentals = list(fundamentals_dict.values)[0]
    end_time = fundamentals.end_time
    for fundamental in fundamentals.data: # Iterate Symbols
        if not fundamental.has_fundamental_data:
            continue
        symbol = fundamental.symbol
        pe_ratio = fundamental.valuation_ratios.pe_ratio

foreach (var fundamentalsDict in allFundamentalsHistory) // Iterate trading days
{
    var fundamentals = fundamentalsDict.Values.First().Data;
    foreach (Fundamental fundamental in fundamentals) // Iterate Symbols
    {
        if (!fundamental.HasFundamentalData)
        {
            continue;
        }
        var endTime = fundamental.EndTime;
        var symbol = fundamental.Symbol;
        var peRatio = fundamental.ValuationRatios.PERatio;
    }
}

DataDictionary Objects

To get the fundamental data points for each Equity, iterate through the history request result.

foreach (var slice in allOneAttributeHistory)
{
    var endTime = slice.Time;
    foreach (var symbol in symbols)
    {
        if (slice.ContainsKey(symbol))
        {
            var peRatio = slice[symbol];
        }
    }
}

You can also iterate through each data point in the slice.

foreach (var slice in allOneAttributeHistory)
{
    var endTime = slice.Time;
    foreach (var kvp in slice)
    {
        var symbol = kvp.Key;
        var peRatio = kvp.Value;
    }
}

You can also use LINQ to select the historical data points.

var symbol = symbols.Last();
var values = allOneAttributeHistory.Select(slice => slice[symbol]);

You need some historical Equity fundamental data to produce plots. You can use many of the supported plotting librariesPlot.NET package to visualize data in various formats. For example, you can plot line charts.

Follow these steps to plot line charts using built-in methodsPlotly.NET package:

1. Get some historical data.

var history = history = qb.History<Fundamental>(symbols, new DateTime(2014, 1, 1), new DateTime(2015, 1, 1));

history = qb.history[Fundamental](symbols, datetime(2014, 1, 1), datetime(2015, 1, 1))

2. Load the Plotly.NET package.

#r "../Plotly.NET.dll"
#r "../Plotly.NET.Interactive.dll"

using Plotly.NET;
using Plotly.NET.Interactive;
using Plotly.NET.LayoutObjects;

3. Create Line objects for each Symbol.

var charts = symbols.Select(
    symbol => Chart2D.Chart.Line<DateTime, decimal, string>(
        history.Select(x => (DateTime)x.Time),
        history.Select(x => (decimal)x[symbol].ValuationRatios.PERatio)),
        Name: symbol.Value
    )
);

4. Create a Layout.
   

LinearAxis xAxis = new LinearAxis();
xAxis.SetValue("title", "Time");
LinearAxis yAxis = new LinearAxis();
yAxis.SetValue("title", "PE Ratio");
Title title = Title.init("PE Ratios Over Time");

Layout layout = new Layout();
layout.SetValue("xaxis", xAxis);
layout.SetValue("yaxis", yAxis);
layout.SetValue("title", title);

5. Combine the charts and assign the Layout to the chart.
   

var chart = Plotly.NET.Chart.Combine(charts);
chart.WithLayout(layout);

6. Convert to pandas DataFrame.

data = {}
for fundamental_dict in history: # Iterate trading days
    for symbol, fundamental in fundamental_dict.items(): # Iterate Symbols
        datum = data.get(symbol, dict())
        datum['index'] = datum.get('index', [])
        datum['index'].append(fundamental.end_time)
        datum['pe_ratio'] = datum.get('pe_ratio', [])
        datum['pe_ratio'].append(fundamental.valuation_ratios.pe_ratio)
        data[symbol] = datum

df = pd.DataFrame()
for symbol, datum in data.items():
    df_symbol = pd.DataFrame({symbol: pd.Series(datum['pe_ratio'], index=datum['index'])})
    df = pd.concat([df, df_symbol], axis=1)

7. Call the plot method on the history DataFrame.

df.plot(title='PE Ratio Over Time', figsize=(15, 8))

8. Show the plot.

plt.show()

HTML(GenericChart.toChartHTML(chart))

Line charts display the value of the property you selected in a time series.