stock indicatorsfor .NET

True Strength Index (TSI) ​

Created by William Blau, the True Strength Index is a momentum oscillator that uses a series of exponential moving averages to depicts trends in price changes. [Discuss] 💬

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csharp
// C# usage syntax
IReadOnlyList<TsiResult> results =
  bars.ToTsi(lookbackPeriods, smoothPeriods, signalPeriods);

Parameters ​

paramdescription
lookbackPeriods
int		Number of periods (N) for the first EMA. Must be greater than 0. Default is 25.
smoothPeriods
int		Number of periods (M) for the second smoothing. Must be greater than 0. Default is 13.
signalPeriods
int		Number of periods (S) in the TSI moving average. Must be greater than or equal to 0. Default is 7.

Historical price bars requirements ​

You must have at least N+M+100 periods of bars to cover the warmup and convergence periods. Since this uses a two-stage EMA smoothing technique, we recommend you use at least N+M+250 data points prior to the intended usage date for better precision.

bars is a collection of generic TBar historical price bars. It should have a consistent frequency (day, hour, minute, etc). See the Guide for more information.

Response ​

csharp
IReadOnlyList<TsiResult>
  • This method returns a time series of all available indicator values for the bars provided.
  • It always returns the same number of elements as there are in the historical price bars.
  • It does not return a single incremental indicator value.
  • The first N+M-1 periods will have null values since there's not enough data to calculate.
  • Signal will be null for all periods if signalPeriods=0.

🚩 ⚞ Convergence warning

The first N+M+250 periods will have decreasing magnitude, convergence-related precision errors that can be as high as ~5% deviation in indicator values for earlier periods.

TsiResult ​

propertydescription
Timestamp
DateTime		Date from evaluated TBar
Tsi
double?		True Strength Index
Signal
double?		Signal line (EMA of TSI)

Utilities ​

See Utilities and helpers for more information.

Streaming ​

Use the buffer-style List<T> when you need incremental calculations without a hub:

csharp
TsiList tsiList = new(lookbackPeriods, smoothPeriods, signalPeriods);

// call from your WebSocket or SSE message handler
void OnBarReceived(IBar bar) => tsiList.Add(bar);

// based on `ICollection<TsiResult>`; fills as the handler runs
IReadOnlyList<TsiResult> results = tsiList;

Subscribe to a BarHub for advanced streaming scenarios:

csharp
BarHub barHub = new();
TsiHub observer = barHub.ToTsiHub(lookbackPeriods, smoothPeriods, signalPeriods);

// call from your WebSocket or SSE message handler
void OnBarReceived(IBar bar) => barHub.Add(bar);

// results fill as the handler runs
IReadOnlyList<TsiResult> results = observer.Results;

See Buffer lists and Stream hubs for full usage guides.

Chaining ​

This indicator may be generated from any chain-enabled indicator or method.

csharp
// example
var results = bars
    .Use(CandlePart.HL2)
    .ToTsi(..);

Results can be further processed on Tsi with additional chain-enabled indicators.

csharp
// example
var results = bars
    .ToTsi(..)
    .ToSlope(..);

See Chaining indicators for more.