81 lines
2.0 KiB
Python
81 lines
2.0 KiB
Python
from django.db.models import FloatField, IntegerField
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from django.db.models.aggregates import Aggregate
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__all__ = [
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'CovarPop', 'Corr', 'RegrAvgX', 'RegrAvgY', 'RegrCount', 'RegrIntercept',
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'RegrR2', 'RegrSlope', 'RegrSXX', 'RegrSXY', 'RegrSYY', 'StatAggregate',
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]
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class StatAggregate(Aggregate):
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def __init__(self, y, x, output_field=FloatField()):
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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(StatAggregate, self).__init__(y=y, x=x, output_field=output_field)
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self.x = x
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self.y = y
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self.source_expressions = self._parse_expressions(self.y, self.x)
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def get_source_expressions(self):
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return self.y, self.x
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def set_source_expressions(self, exprs):
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self.y, self.x = exprs
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def resolve_expression(self, query=None, allow_joins=True, reuse=None, summarize=False, for_save=False):
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return super(Aggregate, self).resolve_expression(query, allow_joins, reuse, summarize)
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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):
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self.function = 'COVAR_SAMP' if sample else 'COVAR_POP'
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super(CovarPop, self).__init__(y, x)
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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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def __init__(self, y, x):
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super(RegrCount, self).__init__(y=y, x=x, output_field=IntegerField())
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def convert_value(self, value, expression, connection, context):
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if value is None:
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return 0
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return int(value)
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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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