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import math |
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class Observation(object): |
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x = None |
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y = None |
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group_id = None |
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label = None |
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def __init__(self, x=None, label=None, group_id=None, y=None): |
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if x is not None: |
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self.x = x |
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if y is not None: |
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self.y = y |
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if label is not None: |
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self.label = label |
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if group_id is not None: |
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self.group_id = group_id |
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def is_categorical(self): |
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return self.label is not None |
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def is_numerical(self): |
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return self.x is not None |
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class Sample(object): |
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observations = None |
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def __init__(self): |
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self.observations = [] |
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def add(self, observation): |
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self.observations.append(observation) |
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def add_numeric(self, numeric, group_id=None): |
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ob = Observation() |
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ob.x = numeric |
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ob.group_id = group_id |
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self.add(ob) |
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def add_category(self, category, group_id=None): |
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ob = Observation() |
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ob.label = category |
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ob.group_id = group_id |
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self.add(ob) |
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def add_xy(self, x, y, group_id=None): |
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ob = Observation() |
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ob.x = x |
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ob.y = y |
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ob.group_id = group_id |
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self.add(ob) |
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def size(self): |
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return len(self.observations) |
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def get(self, index): |
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return self.observations[index] |
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def is_categorical(self): |
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return self.observations[0].is_categorical() |
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def is_numerical(self): |
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return self.observations[0].is_numerical() |
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def count_by_group_id(self, group_id): |
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return sum(1 for x in self.observations if group_id is None or x.group_id == group_id) |
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class SampleDistribution(object): |
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sample = None |
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group_id = None |
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categorical_value = None |
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is_categorical = False |
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is_numerical = False |
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sd = None |
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sample_size = None |
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mean = None |
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variance = None |
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sum_of_squares= None |
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proportion = None |
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def __init__(self, sample=None, group_id=None, categorical_value=None, mean=None, sd=None, sample_size=None, proportion=None): |
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if group_id is not None: |
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self.group_id = group_id |
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if categorical_value is not None: |
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self.categorical_value = categorical_value |
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if mean is not None: |
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self.mean = mean |
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self.is_numerical = True |
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if proportion is not None: |
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self.proportion = proportion |
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self.is_categorical = True |
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if sample_size is not None: |
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self.sample_size = sample_size |
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if sd is not None: |
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self.sd = sd |
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if self.sd is not None and self.sample_size is not None: |
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self.variance = self.sd * self.sd |
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self.sum_of_squares = self.variance * (self.sample_size-1) |
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if sample is not None: |
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self.build(sample) |
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def build(self, sample): |
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self.sample = sample |
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if sample.is_numerical(): |
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self.mean = SampleDistribution.calculate_mean(sample, self.group_id) |
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self.sum_of_squares = SampleDistribution.calculate_sum_of_squares(sample, self.mean, self.group_id) |
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self.sample_size = sample.count_by_group_id(self.group_id) |
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self.variance = self.sum_of_squares / (self.sample_size - 1) |
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self.sd = math.sqrt(self.variance) |
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self.is_numerical = True |
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elif sample.is_categorical() and self.categorical_value is not None: |
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self.proportion = SampleDistribution.calculate_proportion(sample, self.categorical_value, self.group_id) |
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self.sample_size = sample.count_by_group_id(self.group_id) |
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self.mean = self.proportion * self.sample_size |
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self.variance = self.proportion * (1.0 - self.proportion) * self.sample_size |
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self.is_categorical = True |
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@staticmethod |
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def calculate_mean(sample, group_id): |
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count = 0 |
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the_sum = 0 |
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for i in range(sample.size()): |
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observation = sample.get(i) |
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if group_id is not None and observation.group_id != group_id: |
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continue |
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the_sum += observation.x |
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count += 1 |
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return the_sum / count |
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@staticmethod |
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def calculate_sum_of_squares(sample, mean, group_id): |
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the_sum = 0 |
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for i in range(sample.size()): |
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observation = sample.get(i) |
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if group_id is not None and observation.group_id != group_id: |
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continue |
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the_sum += (observation.x - mean) * (observation.x - mean) |
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return the_sum |
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@staticmethod |
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def calculate_proportion(sample, categorical_value, group_id): |
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counter1 = 0 |
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counter2 = 0 |
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for i in range(sample.size()): |
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observation = sample.get(i) |
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if group_id is not None and observation.group_id != group_id: |
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continue |
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counter2 += 1 |
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if observation.label == categorical_value: |
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counter1 += 1 |
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if counter2 == 0: |
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return 0 |
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return counter1 / counter2 |
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169
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chen0040 /
pysie
