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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"
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