True Strength Index (TSI)
get_tsi(quotes, lookback_periods=25,smooth_periods=13, signal_periods=7)
Parameters
name | type | notes |
---|---|---|
quotes |
Iterable[Quote] | Iterable(such as list or an object having __iter__() ) of the Quote class or its sub-class. • Need help with pandas.DataFrame? |
lookback_periods |
int, default 25 | Number of periods (N ) for the first EMA. Must be greater than 0. |
smooth_periods |
int, default 13 | Number of periods (M ) for the second smoothing. Must be greater than 0. |
signal_periods |
int, default 7 | Number of periods (S ) in the TSI moving average. Must be greater than or equal to 0. |
Historical quotes requirements
You must have at least N+M+100
periods of quotes
to cover the convergence periods. Since this uses a two EMA smoothing techniques, we recommend you use at least N+M+250
data points prior to the intended usage date for better precision.
quotes
is an Iterable[Quote]
collection of historical price quotes. It should have a consistent frequency (day, hour, minute, etc). See the Guide for more information.
Return
TSIResults[TSIResult]
- This method returns a time series of all available indicator values for the
quotes
provided. -
TSIResults
is just a list ofTSIResult
. - It always returns the same number of elements as there are in the historical quotes.
- It does not return a single incremental indicator value.
- The first
N+M-1
periods will haveNone
values since there’s not enough data to calculate. -
signal
will beNone
for all periods ifsignal_periods=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
name | type | notes |
---|---|---|
date |
datetime | Date |
tsi |
float, Optional | True Strength Index |
signal |
float, Optional | Signal line (EMA of TSI) |
Utilities
See Utilities and Helpers for more information.
Example
from stock_indicators import indicators
# This method is NOT a part of the library.
quotes = get_history_from_feed("SPY")
# Calculate 20-period TSI
results = indicators.get_tsi(quotes, 25, 13, 7)
About True Strength Index (TSI)
Created by William Blau, the True Strength Index is a momentum oscillator that depicts trends in price changes. [Discuss]