[ferret_users] Problem with detrending spatial rainfall

To: ferret_users@xxxxxxxx

Subject: [ferret_users] Problem with detrending spatial rainfall

From: Deni Okta Lestari <deniokta.lestari28@xxxxxxxxx>

Date: Sun, 10 Feb 2019 17:11:42 +0900

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Dear ferret user,

I’m trying to detrending for 3D rainfall data. As we all know, the rainfall data has zero value. So, If I try to calculating following this archive https://ferret.pmel.noaa.gov/static/FAQ/analysis/regressions.html :

yes? USE rainfall.nc

yes? LET p = t[gt=rain]

yes? LET q = rain

yes? SET GRID q

yes? GO regresst

yes? LET/TITLE="rainfall - mean, trend" detrended = rain - qhat

the "zero value” also calculated. It will cause the detrended value become -(negative). Any experince for this case?

Hope to get suggestion soon.

Best regards,

Deni