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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"
|
