def __init__(self,
data_frame,
independent_var,
dependent_var,
independent_var_levels=None):
"""
:param data_frame: data frame to use for tests
:param independent_var: a string type column with at least two levels
:param dependent_var: a measure type column
:param independent_var_levels: if independent_var has exactly two levels this parameter can be omitted,
otherwise two levels in independent_var need to be supplied as a tuple
"""
dataframe_helper = DataFrameHelper(data_frame)
# ensure data_frame is valid
if not dataframe_helper.is_valid_data_frame():
raise BIException.dataframe_invalid()
# ensure data_frame contains a column by name independent_var
if not dataframe_helper.has_column(independent_var):
raise BIException.column_does_not_exist(independent_var)
# ensure column, independent_var, is of type string
if not dataframe_helper.is_string_column(independent_var):
raise BIException.non_string_column(independent_var)
# ensure data_frame contains a column by name dependent_var
if not dataframe_helper.has_column(dependent_var):
raise BIException.column_does_not_exist(dependent_var)
# ensure column, dependent_var, is of numeric type
if not dataframe_helper.is_numeric_column(dependent_var):
raise BIException.non_numeric_column(dependent_var)
self._data_frame = data_frame
self._independent_var = independent_var
self._dependent_var = dependent_var
self._independent_var_levels = self._get_independent_var_levels()
if independent_var_levels != None and type(independent_var_levels) in [
list, tuple
]:
if len(independent_var_levels) != 2:
raise BIException(
"independent_var_levels should only contain two levels")
for level in independent_var_levels:
if level not in self._independent_var_levels:
raise BIException('Column, %s, does not have level "%s"' %
(self._independent_var, level))
self._independent_var_levels = independent_var_levels
else:
if len(self._independent_var_levels) != 2:
raise BIException(
'Column, %s, should have exactly two levels, but it has %d levels'
%
(self._independent_var, len(self._independent_var_levels)))
def __init__(self, data_frame, column1, column2):
dataframe_helper = DataFrameHelper(data_frame)
if not dataframe_helper.is_valid_data_frame():
raise BIException.dataframe_invalid()
if not dataframe_helper.has_column(column1):
raise BIException.column_does_not_exist(column1)
if not dataframe_helper.is_numeric_column(column1):
raise BIException.non_numeric_column(column1)
if not dataframe_helper.has_column(column2):
raise BIException.column_does_not_exist(column2)
if not dataframe_helper.is_numeric_column(column2):
raise BIException.non_numeric_column(column2)
self._data_frame = data_frame
self._column1 = column1
self._column2 = column2