INDEX MAXIMA
  0   0.743
  1   0.837
  2   0.838
  4   0.896
  5   1.014
  6   1.003
  7   1.01
  8   1.101
  9   1.097

# fit model for MAX VALUE
  model = AR(data)
  model_fit = model.fit()
  yhat_max = model_fit.predict(len(data),len(data]))