Percentage Price Oscillator (ta.ppo)

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Normalize the fast-minus-slow moving-average difference as a percentage and provide signal and histogram values.

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Run this example

This complete script uses bundled data. It observes the selected output without placing trades.

import numpy as np
from openbacktesting import Backtest, Strategy
from openbacktesting.test import GOOG

data = GOOG.copy()

class Example(Strategy):
    def init(self):
        self.value = self.ta.ppo(self.close)
        self.latest_value = None

    def next(self):
        channel = self.value.ppo
        if channel.valid[-1]:
            self.latest_value = float(channel[-1])

result = Backtest(data, Example).run()
print(result["_strategy"].latest_value)

Call and parameters

self.ta.ppo(
    source=None,
    *,
    fast=12,
    slow=26,
    signal=9,
    scalar=100,
    mamode='sma',
    inputs=None,
    backend=None,
    required_outputs=None,
)

Register in init(). Read the returned channel in next() after checking valid[-1].

Parameter	Meaning	Type	Default	Allowed values
fast	Fast component lookback in bars.	int	12	Minimum: 1
slow	Slow component lookback in bars.	int	26	Minimum: 1
signal	Signal-line smoothing period in bars.	int	9	Minimum: 1
scalar	Multiplier applied to the formula output.	int	100	Minimum: 1
mamode	Moving-average algorithm; choose one of the listed values.	str	sma	Allowed values: ['sma', 'ema', 'rma', 'wma']

source/named source arguments accept a column name or same-run single-channel handle. Alternatively, inputs maps each input below to a column or handle. backend selects a supported implementation; required_outputs selects channels for readiness diagnostics. See shared arguments and handles.

Inputs and outputs

Required inputs: close.

Channel	Meaning
ppo	Ppo output
histogram	Difference between the main and signal lines
signal	Signal line

Reading values safely

Insufficient history or missing inputs can make a channel invalid. Check that channel's valid mask; ready is diagnostic and never suppresses next(). Multi-output results may have different valid channels on the same bar.

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