esmtools.stats.rm_poly

esmtools.stats.rm_poly(x, y, order, dim='time', nan_policy='none')

Removes a polynomial fit from y regressed onto x.

Parameters:

• y (x,) – Independent and dependent variables used in the polynomial fit.
• order (int) – Order of polynomial fit to perform.
• dim (str, optional) – Dimension to apply polynomial fit over. Defaults to “time”.
• nan_policy (str, optional) –

  Policy to use when handling nans. Defaults to “none”.

  • ’none’, ‘propagate’: If a NaN exists anywhere on the given dimension,

    return nans for that whole dimension.

  • ’raise’: If a NaN exists at all in the datasets, raise an error.

  • ’omit’, ‘drop’: If a NaN exists in x or y, drop that index and

    compute the slope without it.

Returns:

y with polynomial fit of order order removed.

Return type:

xarray object