diff --git a/LICENSE b/LICENSE
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new mode 100755
diff --git a/Makefile b/Makefile
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diff --git a/README.md b/README.md
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diff --git a/requirements.txt b/requirements.txt
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diff --git a/setup.py b/setup.py
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new mode 100755
index 476629c05304a97b4eeb89bc27c708696161bfd5..c3bf35e010e6e53a2922cf2a13f81c765479246d
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name = "impetuous-gfa",
-    version = "0.15.0",
+    version = "0.16.0",
     author = "Richard Tjörnhammar",
     author_email = "richard.tjornhammar@gmail.com",
     description = "Impetuous Quantification, Enrichment and Group Variation Analysis",
diff --git a/src/impetuous/__init__.py b/src/impetuous/__init__.py
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diff --git a/src/impetuous/clustering.py b/src/impetuous/clustering.py
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diff --git a/src/impetuous/convert.py b/src/impetuous/convert.py
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diff --git a/src/impetuous/hierarchal.py b/src/impetuous/hierarchal.py
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diff --git a/src/impetuous/impetuous.py b/src/impetuous/impetuous.py
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diff --git a/src/impetuous/pathways.py b/src/impetuous/pathways.py
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diff --git a/src/impetuous/quantification.py b/src/impetuous/quantification.py
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index ee34c370b588c82d6073c918e73a440d0c80f553..e18c4db5c1ee5d6c403301cfc97c10f95dbc473d
--- a/src/impetuous/quantification.py
+++ b/src/impetuous/quantification.py
@@ -126,6 +126,8 @@ def run_rpls_regression ( analyte_df , journal_df , formula ,
             journal_df.loc[ ':'.join(pair) ] = [ p[0]+'-'+p[1] for p in journal_df.loc[ pair,: ].T.values ]
             add_pairs.append(':'.join(pair))
     use_categories = list(set(find_category_variables(formula.split('~')[1])))
+    use_categories =  [u for u in use_categories if 'C('+u+')' in set(formula.replace(' ','').split('~')[1].split('+'))]
+    #
     use_categories = [ *use_categories,*add_pairs ]
     #
     if len( use_categories )>0 :