Source code for django.contrib.postgres.aggregates.statistics
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
)
[docs]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)
[docs]class RegrCount(StatAggregate):
function = "REGR_COUNT"
output_field = IntegerField()
empty_result_set_value = 0