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MBCn - Why an univariate adjustment before applying NpdfTransform? #1894

Answered by coxipi
sylvainmarchi asked this question in Questions
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Hi Sylvain,

You are right, in (Cannon, 2018), we first have:

  1. Npdf transform on raw standarized data
  2. Univariate QDM on raw data
  3. Reorder QDM-adjusted (output of 2.) using the Npdf transformed data (output of 1.)

In the xclim notebook you point out, we had:

  1. Univariate QDM on raw data
  2. Npdf transform on QDM-adjusted and standarized data
  3. Reorder QDM-adjusted (output of 1.) using the Npdf transformed data (output of 2.)

I also concluded there was not much difference, but in newer version of xclim, we follow the exact methology proposed in (Cannon, 2018).

Both the standardization and univariate QDM are now performed in a single class MBCn in recent versions of xclim, you can see recent notebo…

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@bweeding
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@coxipi
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coxipi Mar 4, 2025
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@bweeding
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Answer selected by sylvainmarchi
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