com : float, optional
Specify decay in terms of center of mass, \(\alpha = 1 / (1 + com),\text{ for } com \geq 0\)
span : float, optional
Specify decay in terms of span, \(\alpha = 2 / (span + 1),\text{ for } span \geq 1\)
halflife : float, optional
Specify decay in terms of half-life, \(\alpha = 1 - exp(log(0.5) / halflife),\text{ for } halflife > 0\)
alpha : float, optional
Specify smoothing factor \(\alpha\) directly, \(0 < \alpha \leq 1\)
New in version 0.18.0.
min_periods : int, default 0
Minimum number of observations in window required to have a value (otherwise result is NA).
freq : None or string alias / date offset object, default=None (DEPRECATED)
Frequency to conform to before computing statistic
adjust : boolean, default True
Divide by decaying adjustment factor in beginning periods to account for imbalance in relative weightings (viewing EWMA as a moving average)
ignore_na : boolean, default False
Ignore missing values when calculating weights; specify True to reproduce pre-0.15.0 behavior
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