code: def param_names(self):
      return ["sigma2.measurement", "sigma2.level", "sigma2.trend"]
  
file_path: statsmodels/examples/python/statespace_local_linear_trend.py
imports: import numpy
  import pandas
  from scipy.stats import norm
  import statsmodels.api
  import matplotlib.pyplot
  import requests
  from io import BytesIO
  from zipfile import ZipFile
label_desc: Use image node_id 2 for calling the LocalLinearTrend obj's underlying member method code with example usage: obj.param_names() and returns: list