created default transformation variable in experiment_setup.py

src/run_modules/experiment_setup.py

@@ -19,6 +19,7 @@ DEFAULT_STATIONS = ['DEBW107', 'DEBY081', 'DEBW013', 'DEBW076', 'DEBW087', 'DEBY
 DEFAULT_VAR_ALL_DICT = {'o3': 'dma8eu', 'relhum': 'average_values', 'temp': 'maximum', 'u': 'average_values',
                         'v': 'average_values', 'no': 'dma8eu', 'no2': 'dma8eu', 'cloudcover': 'average_values',
                         'pblheight': 'maximum'}
+DEFAULT_TRANSFORMATION = {"scope": "data", "method": "standardise", "mean": "estimate"}
 
 
 class ExperimentSetup(RunEnvironment):
@@ -77,8 +78,7 @@ class ExperimentSetup(RunEnvironment):
         self._set_param("window_history_size", window_history_size, default=13)
         self._set_param("overwrite_local_data", overwrite_local_data, default=False, scope="general.preprocessing")
         self._set_param("sampling", sampling)
-        self._set_param("transformation", transformation, default={"scope": "data", "method": "standardise",
-                                                                   "mean": "estimate"})
+        self._set_param("transformation", transformation, default=DEFAULT_TRANSFORMATION)
         self._set_param("transformation", None, scope="general.preprocessing")
 
         # target