code: def rollsd(self, scale=1, **kwargs):
          '''A :ref:`rolling function <rolling-function>` for
          stadard-deviation values:
          Same as::
  
              self.rollapply('sd', **kwargs)
          '''
          ts = self.rollapply('sd', **kwargs)
          if scale != 1:
              ts *= scale
          return tf rollsd(self, scale=1, **kwargs):
          '''A :ref:`rolling function <rolling-function>` for
          stadard-deviation values:
          Same as::
  
              self.rollapply('sd', **kwargs)
          '''
          ts = self.rollapply('sd', **kwargs)
          if scale != 1:
              ts *= scale
          return ts
docs: A :ref:`rolling function <rolling-function>` for
          stadard-deviation values:
          Same as::
  
              self.rollapply('sd', **kwargs)