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venv/Lib/site-packages/django/contrib/postgres/aggregates/statistics.py

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+from django.db.models import Aggregate, FloatField, IntegerField
+
+__all__ = [
+    'CovarPop', 'Corr', 'RegrAvgX', 'RegrAvgY', 'RegrCount', 'RegrIntercept',
+    'RegrR2', 'RegrSlope', 'RegrSXX', 'RegrSXY', 'RegrSYY', 'StatAggregate',
+]
+
+
+class StatAggregate(Aggregate):
+    output_field = FloatField()
+
+    def __init__(self, y, x, output_field=None, filter=None, default=None):
+        if not x or not y:
+            raise ValueError('Both y and x must be provided.')
+        super().__init__(y, x, output_field=output_field, filter=filter, default=default)
+
+
+class Corr(StatAggregate):
+    function = 'CORR'
+
+
+class CovarPop(StatAggregate):
+    def __init__(self, y, x, sample=False, filter=None, default=None):
+        self.function = 'COVAR_SAMP' if sample else 'COVAR_POP'
+        super().__init__(y, x, filter=filter, default=default)
+
+
+class RegrAvgX(StatAggregate):
+    function = 'REGR_AVGX'
+
+
+class RegrAvgY(StatAggregate):
+    function = 'REGR_AVGY'
+
+
+class RegrCount(StatAggregate):
+    function = 'REGR_COUNT'
+    output_field = IntegerField()
+    empty_result_set_value = 0
+
+
+class RegrIntercept(StatAggregate):
+    function = 'REGR_INTERCEPT'
+
+
+class RegrR2(StatAggregate):
+    function = 'REGR_R2'
+
+
+class RegrSlope(StatAggregate):
+    function = 'REGR_SLOPE'
+
+
+class RegrSXX(StatAggregate):
+    function = 'REGR_SXX'
+
+
+class RegrSXY(StatAggregate):
+    function = 'REGR_SXY'
+
+
+class RegrSYY(StatAggregate):
+    function = 'REGR_SYY'