class_docstr: collection of descriptive statistical methods for time series
  
      
class_docstr_tok: ["collection","of","descriptive","statistical","methods","for","time","series"]
code: def pacf(self, nlags=40):
      return stt.pacf(self.data, nlags=nlags)
  
file_path: statsmodels/statsmodels/tsa/descriptivestats.py
imports: import numpy
  from .None import stattools
label_desc: Use image node_id 6 for calling the TsaDescriptive obj's underlying member method code with example usage: obj.pacf(nlags) and returns: stt