docs: def add_macd(self,fast_period=12,slow_period=26,signal_period=9,column=None,
  				 name='',str=None,**kwargs):
  		"""
  		Add Moving Average Convergence Divergence (MACD) study to QuantFigure.studies
  
  		Parameters:
  			fast_period : int
  				MACD Fast Period
  			slow_period : int
  				MACD Slow Period
  			signal_period : int
  				MACD Signal Period
  			column :string
  				Defines the data column name that contains the 
  				data over which the study will be applied. 
  				Default: 'close'
  			name : string
  				Name given to the study
  			str : string
  				Label factory for studies
  				The following wildcards can be used:
  					{name} : Name of the column
  					{study} : Name of the study
  					{period} : Period used
  				Examples:
  					'study: {study} - period: {period}'
  		kwargs: 
  			legendgroup : bool
  				If true, all legend items are grouped into a 
  				single one
  			All formatting values available on iplot()
  		"""
  
  		if not column:
  			column=self._d['close']
  		study={'kind':'macd',
  			   'name':name,
  			   'params':{'fast_period':fast_period,'slow_period':slow_period,
  						 'signal_period':signal_period,'column':column,
  						 'str':str},
  			  'display':utils.merge_dict({'legendgroup':False,'colors':['blue','red']},kwargs)}
  		study['params']['periods']='[{0},{1},{2}]'.format(fast_period,slow_period,signal_period)
  		self._add_study(study)