diff_diff.DeltaRM

class diff_diff.DeltaRM[source]

Bases: object

Relative magnitudes restriction on trend violations (Delta^{RM}).

Post-treatment violations are bounded by Mbar times the maximum absolute pre-treatment violation:

|delta_post| <= Mbar * max(|delta_pre|)

When Mbar=0, this enforces exact parallel trends post-treatment. Mbar=1 means post-period violations can be as large as the worst observed pre-period violation.

Parameters:: Mbar (float) – Scaling factor for maximum pre-period violation.

Examples

>>> delta = DeltaRM(Mbar=1.0)
>>> delta.Mbar
1.0

__init__(Mbar=1.0)

Parameters:: Mbar (float)
Return type:: None

Methods

__init__([Mbar])

Attributes

Mbar

Mbar: float = 1.0

__init__(Mbar=1.0)

Parameters:: Mbar (float)
Return type:: None