update_m

Function to calculate <code>m</code>

internal

An implementation of the adaptive forgetting factor scheme described in Bodenham and Adams (2016) <doi:10.1007/s11222-016-9684-8> which adaptively estimates the mean and variance of a stream in order to detect multiple changepoints in streaming data. The implementation is in 'C++' and uses 'Rcpp'. Additionally, implementations of the fixed forgetting factor scheme from the same paper, as well as the classic cumulative sum ('CUSUM') and exponentially weighted moving average ('EWMA') methods, are included.

Dean Bodenham

ffstream

Forgetting Factor Methods for Change Detection in Streaming Data

update_m function

<dl><dt>m_old</dt>
<dd>The old (previous) value of <code>m</code>.</dd>
<dt>lambda_old</dt>
<dd>The old (previous) value of <code>lambda</code>.</dd>
<dt>x_new</dt>
<dd>The current observation.</dd></dl>

Arguments

Calculate m — update_m

<dl>

<dt>m_old</dt>
<dd>The old (previous) value of <code>m</code>.</dd>


<dt>lambda_old</dt>
<dd>The old (previous) value of <code>lambda</code>.</dd>


<dt>x_new</dt>
<dd>The current observation.</dd>

</dl>

update_m: Calculate `m`

Description

Usage

Arguments