Class: ArelExtensions::Nodes::Variance

Inherits:

Function

• Object
• Arel::Nodes::Function
• Function
• ArelExtensions::Nodes::Variance

Defined in:

lib/arel_extensions/nodes/std.rb

Constant Summary

RETURN_TYPE =

:number

Instance Attribute Summary

• #unbiased_estimator ⇒ Object

  Returns the value of attribute unbiased_estimator.

Instance Method Summary

• #initialize(expr) ⇒ Variance constructor

  A new instance of Variance.

Methods inherited from Function

#as, #convert_to_date_node, #convert_to_datetime_node, #convert_to_node, #convert_to_number, #convert_to_string_node, #expr, #left, #return_type, #right, #type_of_attribute

Methods included from Predications

#cast, #convert_to_node, #imatches, #in, #matches, #not_in, #when

Constructor Details

#initialize(expr) ⇒ Variance

Returns a new instance of Variance.

# File 'lib/arel_extensions/nodes/std.rb', line 18

def initialize expr
    col = expr.first
       @unbiased_estimator = expr[1]
   	super [col]
end

Instance Attribute Details

#unbiased_estimator ⇒ Object

Returns the value of attribute unbiased_estimator.

# File 'lib/arel_extensions/nodes/std.rb', line 17

def unbiased_estimator
  @unbiased_estimator
end