diff --git a/MANIFEST.in b/MANIFEST.in
index 88bdd08d..6c3f4ebd 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,4 @@
 include requirements.txt
 include LICENSE
-include NOTICE
\ No newline at end of file
+include NOTICE
+include extras.json
\ No newline at end of file
diff --git a/extras.json b/extras.json
new file mode 100644
index 00000000..35033643
--- /dev/null
+++ b/extras.json
@@ -0,0 +1 @@
+{"diptest": ["diptest"]}
\ No newline at end of file
diff --git a/popmon/__init__.py b/popmon/__init__.py
index ecd13edb..2e770a6f 100644
--- a/popmon/__init__.py
+++ b/popmon/__init__.py
@@ -29,6 +29,7 @@
 from popmon import decorators
 
 from .config import Settings
+from .extensions import extensions
 from .pipeline.metrics import df_stability_metrics, stability_metrics
 from .pipeline.report import df_stability_report, stability_report
 from .stitching import stitch_histograms
@@ -46,4 +47,5 @@
     "stitch_histograms",
     "__version__",
     "Settings",
+    "extensions",
 ]
diff --git a/popmon/analysis/profiling/hist_profiler.py b/popmon/analysis/profiling/hist_profiler.py
index 53d51714..e2db9148 100644
--- a/popmon/analysis/profiling/hist_profiler.py
+++ b/popmon/analysis/profiling/hist_profiler.py
@@ -95,9 +95,15 @@ def _profile_1d_histogram(self, name, hist):
 
         # calc 1d-histogram statistics
         profile = {}
-        args = [bin_labels, bin_counts]
+        if otype == "cat":
+            args = [bin_labels, bin_counts]
+        else:
+            bin_width = hist.bin_width()
+            args = [bin_labels, bin_counts, bin_width]
 
         profile.update(Profiles.run(args, dim=1, htype=otype))
+
+        args = [bin_labels, bin_counts]
         profile.update(Profiles.run(args, dim=1, htype="all"))
 
         # difference between htype=None and htype="all" are arguments (bin labels vs hist)
diff --git a/popmon/analysis/profiling/profiles.py b/popmon/analysis/profiling/profiles.py
index 2f9970e8..1a348b1c 100644
--- a/popmon/analysis/profiling/profiles.py
+++ b/popmon/analysis/profiling/profiles.py
@@ -45,7 +45,7 @@
     dim=1,
     htype="num",
 )
-def profile_quantiles(x, w):
+def profile_quantiles(x, w, bin_width):
     return tuple(
         pm_np.quantile(
             x, q=[0.0, 1.0, 0.01, 0.05, 0.16, 0.50, 0.84, 0.95, 0.99], weights=w
@@ -54,12 +54,12 @@ def profile_quantiles(x, w):
 
 
 @Profiles.register(key="mean", description="Mean value", dim=1, htype="num")
-def profile_mean(x, w):
+def profile_mean(x, w, bin_width):
     return pm_np.mean(x, w)
 
 
 @Profiles.register(key="std", description="Standard deviation", dim=1, htype="num")
-def profile_std(x, w):
+def profile_std(x, w, bin_width):
     return pm_np.std(x, w)
 
 
diff --git a/popmon/extensions/__init__.py b/popmon/extensions/__init__.py
new file mode 100644
index 00000000..cef93965
--- /dev/null
+++ b/popmon/extensions/__init__.py
@@ -0,0 +1,25 @@
+# Copyright (c) 2022 ING Wholesale Banking Advanced Analytics
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+from popmon.extensions.profile_diptest import Diptest
+
+extensions = [Diptest()]
+for extension in extensions:
+    extension.check()
diff --git a/popmon/extensions/extension.py b/popmon/extensions/extension.py
new file mode 100644
index 00000000..c7892e91
--- /dev/null
+++ b/popmon/extensions/extension.py
@@ -0,0 +1,43 @@
+# Copyright (c) 2022 ING Wholesale Banking Advanced Analytics
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+import importlib.util
+from typing import Callable, List
+
+
+def is_installed(package):
+    is_present = importlib.util.find_spec(package)
+    return is_present is not None
+
+
+class Extension:
+    name: str
+    requirements: List[str]
+    extension: Callable
+
+    @property
+    def extras(self):
+        return {self.name: self.requirements}
+
+    def check(self):
+        if all(is_installed(package) for package in self.requirements):
+            func = self.extension
+            func = func.__func__
+            func()
diff --git a/popmon/extensions/profile_diptest.py b/popmon/extensions/profile_diptest.py
new file mode 100644
index 00000000..22ec8460
--- /dev/null
+++ b/popmon/extensions/profile_diptest.py
@@ -0,0 +1,71 @@
+# Copyright (c) 2022 ING Wholesale Banking Advanced Analytics
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+"""Hartigan & Hartigan's dip test for unimodality
+
+How to enable this extension:
+    - Install te diptest package: `pip install diptest` or `pip install popmon[diptest]`
+    - To show the diptest values in your report:
+        settings.report.show_stats.append("diptest*")
+        OR
+        settings.report.extended_report = True
+
+"""
+import numpy as np
+
+from popmon.analysis import Profiles
+from popmon.extensions.extension import Extension
+
+
+def extension():
+    from diptest import diptest
+
+    @Profiles.register(
+        key=["diptest_value", "diptest_pvalue"],
+        description=[
+            "diptest value for Hartigan & Hartigan's test for unimodality",
+            "p-value for the diptest",
+        ],
+        dim=1,
+        htype="num",
+    )
+    def diptest_profile(bin_centers, bin_values, bin_width, rng=None):
+        if rng is None:
+            rng = np.random.default_rng()
+
+        counts = bin_values.astype(int)
+        n = counts.sum()
+        hbw = bin_width / 2
+
+        # unpack histogram into ordered samples
+        sample = np.repeat(bin_centers, counts)
+
+        # uniform noise
+        sample_noise = sample + rng.uniform(-hbw, hbw, n)
+
+        # compute diptest
+        dip, pval = diptest(sample_noise)
+        return dip, pval
+
+
+class Diptest(Extension):
+    name = "diptest"
+    requirements = ["diptest"]
+    extension = extension
diff --git a/popmon/extensions/utils.py b/popmon/extensions/utils.py
new file mode 100644
index 00000000..fb5ea54a
--- /dev/null
+++ b/popmon/extensions/utils.py
@@ -0,0 +1,45 @@
+# Copyright (c) 2022 ING Wholesale Banking Advanced Analytics
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+# the Software, and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import json
+from pathlib import Path
+
+from popmon.extensions import extensions
+
+
+def get_extras():
+    """Obtain extras from extensions"""
+    extras = {}
+    for extension in extensions:
+        extras.update(extension.extras)
+
+    return extras
+
+
+def write_extras():
+    """Write extras to extras.json for setup.py"""
+    extras = get_extras()
+    file_path = Path(__file__).parent.parent.parent / "extras.json"
+
+    with file_path.open("w") as f:
+        json.dump(extras, f)
+
+
+if __name__ == "__main__":
+    write_extras()
diff --git a/setup.py b/setup.py
index 65a9e2bf..2485d02b 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,5 @@
+import json
+
 from setuptools import find_packages, setup
 
 __version__ = "1.0.0"
@@ -9,6 +11,10 @@
 with open("README.rst", encoding="utf-8") as f:
     long_description = f.read()
 
+# read dynamically generated extras from json file
+with open("extras.json") as f:
+    EXTRAS = json.loads(f.read())
+
 
 def setup_package() -> None:
     """The main setup method.
@@ -28,6 +34,7 @@ def setup_package() -> None:
         python_requires=">=3.6",
         packages=find_packages(),
         install_requires=REQUIREMENTS,
+        extras_require=EXTRAS,
         classifiers=[
             "Programming Language :: Python :: 3",
             "License :: OSI Approved :: MIT License",