code: def test_ppc():
      """
      Tests PPC value
      """
      model = ARIMA(data=data, ar=2, ma=2, family=Skewt())
      x = model.fit("BBVI", iterations=100, quiet_progress=True)
      p_value = model.ppc(nsims=40)
      assert 0.0 <= p_value <= 1.0
  
file_path: pyflux/pyflux/arma/tests/test_arima_skewt.py
imports: import numpy
  from pyflux.arma import ARIMA
  from pyflux.families import Skewt
label_desc: Use image node_id 11 for calling a global function with example usage: test_ppc() without return types