Thank you very much
@inyakirm FME doesn't have a built-in equivalent of the ArcGIS Trend Analysis tool. This is one of the many reasons that we added the RCaller to FME. 'R' has many trend analysis modules and the FME RCaller Tutorial includes and example of using a trend algorithm - kriging.
Thank you for your answer.
I already tried that tool but it hasn't a smooth trend effect in the raster.