add global signal param

Author: Shoshana Berleant

nipype/algorithms/stats.py

@@ -39,6 +39,9 @@ class SignalExtractionInputSpec(BaseInterfaceInputSpec):
     out_file = File('signals.tsv', usedefault=True, exists=False,
                     mandatory=False, desc='The name of the file to output to. '
                     'signals.tsv by default')
+    include_global = traits.Bool(False, usedefault=True, mandatory=False,
+                                 desc='If True, include an extra column '
+                                 'labeled "global"')
     detrend = traits.Bool(False, usedefault=True, mandatory=False,
                           desc='If True, perform detrending using nilearn.')
 

nipype/algorithms/tests/test_stats.py

@@ -36,7 +36,6 @@ def setUp(self):
         utils.save_toy_nii(self.fake_fmri_data, self.filenames['in_file'])
         utils.save_toy_nii(self.fake_label_data, self.filenames['label_files'])
 
-    @skipif(no_nilearn)
     def test_signal_extraction(self):
         # run
         stats.SignalExtraction(in_file=self.filenames['in_file'],
@@ -45,6 +44,7 @@ def test_signal_extraction(self):
         # assert
         self.assert_expected_output(self.base_wanted)
 
+
     @skipif(no_nilearn)
     @raises(ValueError)
     def test_signal_extraction_bad_label_list(self):