# cf.CellMeasure.sd

`CellMeasure.``sd`()

  The unweighted sample standard deviation of the data array.

  See also

  `collapse`, `max`, `mean`, `mid_range`, `min`, `range`, `sample_size`, `sum`, `var`

  Examples 1: |

      >>> d = f.sd()

  Returns: | out: `cf.Data` The unweighted standard deviation of the data array.
  Examples 2: |

      >>> f.data
      <CF Data: [[[236.512756348, ..., 256.93371582]]] K>
      >>> f.sd()
      22.685052535
      >>> f.sd().data
      <CF Data: 22.685052535 K>