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