code: def estimateTrend(self):
      self.defineTrends()
      for trend in self.mTrendList:
          trend.mSignalFrame = self.mSignalFrame
          trend.mTimeInfo = self.mTimeInfo
          trend.mSplit = self.mSplit
      self.addTrendInputVariables()
      self.estimateTrends()
  
imports: import pandas
  import numpy
  from .None import Time
  from .None import Perf
  from .None import Plots
  from .None import Utils
  import sklearn
  import sklearn.preprocessing
  import sklearn.linear_model
  from sklearn.feature_selection import RFE
  from sklearn.linear_model import LinearRegression
label_desc: Use image node_id 8 for calling the cTrendEstimator obj's underlying member method code with example usage: obj.estimateTrend() without return types