class_docstr: Statistical Power calculations, Base Class
  
  so far this could all be class methods
class_docstr_tok: ["Statistical","Power","calculations",",","Base","Class","so","far","this","could","all","be","class","methods"]
code: def _power_identity(self, *args, **kwds):
      power_ = kwds.pop("power")
      return self.power(*args, **kwds) - power_
  
imports: import warnings
  import numpy
  from scipy import stats, optimize, special
  from statsmodels.tools.rootfinding import brentq_expanding
label_desc: Use image node_id 3 for calling the Power obj's underlying member method code with example usage: obj._power_identity() and returns: unknown