Class: Statsample::Token

Inherits:
Object show all
Defined in:
lib/statsample/formula/formula.rb

Overview

To encapsulate interaction as well as non-interaction terms

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(value, full = true) ⇒ Token

Returns a new instance of Token.



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# File 'lib/statsample/formula/formula.rb', line 164

def initialize(value, full = true)
  @interact_terms = value.include?(':') ? value.split(':') : [value]
  @full = coerce_full full
end

Instance Attribute Details

#full ⇒ Object (readonly)

Returns the value of attribute full.



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# File 'lib/statsample/formula/formula.rb', line 162

def full
  @full
end

#interact_terms ⇒ Object (readonly)

Returns the value of attribute interact_terms.



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# File 'lib/statsample/formula/formula.rb', line 162

def interact_terms
  @interact_terms
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/statsample/formula/formula.rb', line 162

def value
  @value
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/statsample/formula/formula.rb', line 223

def <=>(other)
  size <=> other.size
end

#==(other) ⇒ Object Also known as: eql? 



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# File 'lib/statsample/formula/formula.rb', line 212

def ==(other)
  value == other.value &&
    full == other.full
end

#add(other) ⇒ Object 



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# File 'lib/statsample/formula/formula.rb', line 180

def add(other)
  # ANYTHING + FACTOR- : ANYTHING = FACTOR : ANYTHING
  # ANYTHING + ANYTHING : FACTOR- = ANYTHING : FACTOR
  if size > other.size
    other.add self

  elsif other.size == 2 &&
        size == 1 &&
        other.interact_terms.last == value &&
        other.full.last == full.first &&
        other.full.first == false
    Token.new(
      "#{other.interact_terms.first}:#{value}",
      [true, other.full.last]
    )

  elsif other.size == 2 &&
        size == 1 &&
        other.interact_terms.first == value &&
        other.full.first == full.first &&
        other.full.last == false
    Token.new(
      "#{value}:#{other.interact_terms.last}",
      [other.full.first, true]
    )

  elsif value == '1' &&
        other.size == 1
    Token.new(other.value, true)
  end
end

#expand ⇒ Object 



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# File 'lib/statsample/formula/formula.rb', line 234

def expand
  case size
  when 0
    [self]
  when 1
    [Token.new('1'), Token.new(value, false)]
  when 2
    a, b = interact_terms
    [Token.new('1'), Token.new(a, false), Token.new(b, false),
     Token.new(a + ':' + b, [false, false])]
  end
end

#hash ⇒ Object 



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# File 'lib/statsample/formula/formula.rb', line 219

def hash
  value.hash ^ full.hash
end

#size ⇒ Object 



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# File 'lib/statsample/formula/formula.rb', line 173

def size
  # TODO: Return size 1 for value '1' also
  # CAn't do this at the moment because have to make
  # changes in sorting first
  value == '1' ? 0 : interact_terms.size
end

#to_df(df) ⇒ Object 



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# File 'lib/statsample/formula/formula.rb', line 247

def to_df(df)
  case size
  when 1
    if df[value].category?
      df[value].contrast_code full: full.first
    else
      Daru::DataFrame.new value => df[value].to_a
    end
  when 2
    to_df_when_interaction(df)
  end
end

#to_s ⇒ Object 



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# File 'lib/statsample/formula/formula.rb', line 227

def to_s
  interact_terms
    .zip(full)
    .map { |t, f| f ? t : t + '(-)' }
    .join ':'
end