code: def mnc2mvsk(args):
      """convert central moments to mean, variance, skew, kurtosis"""
      # convert four non-central moments to central moments
      mnc, mnc2, mnc3, mnc4 = args
      mc = mnc
      mc2 = mnc2 - mnc * mnc
      mc3 = mnc3 - (3 * mc * mc2 + mc**3)  # 3rd central moment
      mc4 = mnc4 - (4 * mc * mc3 + 6 * mc * mc * mc2 + mc**4)
      return mc2mvsk((mc, mc2, mc3, mc4))
  
file_path: statsmodels/statsmodels/sandbox/distributions/tests/check_moments.py
imports: import numpy
  from scipy import stats
  from statsmodels.sandbox.distributions.sppatch import expect_v2
  from .distparams import distcont
label_desc: Use image node_id 2 for calling a global function with example usage: mnc2mvsk(args) and returns: mc2mvsk