Question: What was Occidental Petroleum's MACD Signal on October 13, 2025? (Standard parameters: fast 12, slow 26, signal 9; Require 104 data points to warm up; EMA uses the first data point as the initial value) Using unadjusted prices, write down the indicator formula, collect the raw data, calculate the answer, and keep four decimal places. Please list the raw data and key calculation process.
Formula: Signal Line = EMA_{n_{signal}}(MACD Line); MACD Line = EMA_{n_{fast}}(P) - EMA_{n_{slow}}(P)
Data:
date,close
2025-05-14,43.81999969482422
2025-05-15,43.369998931884766
2025-05-16,43.040000915527344
2025-05-19,42.310001373291016
2025-05-20,41.900001525878906
2025-05-21,41.130001068115234
2025-05-22,41.08000183105469
2025-05-23,41.290000915527344
2025-05-27,41.619998931884766
2025-05-28,41.119998931884766
2025-05-29,41.459999084472656
2025-05-30,40.77999877929688
2025-06-02,41.43999862670898
2025-06-03,42.68999862670898
2025-06-04,41.90999984741211
2025-06-05,41.81999969482422
2025-06-06,42.540000915527344
2025-06-09,43.2400016784668
2025-06-10,43.90999984741211
2025-06-11,44.84000015258789
2025-06-12,44.7599983215332
2025-06-13,46.45000076293945
2025-06-16,45.33000183105469
2025-06-17,45.97999954223633
2025-06-18,45.34999847412109
2025-06-20,45.630001068115234
2025-06-23,43.95000076293945
2025-06-24,42.47999954223633
2025-06-25,42.41999816894531
2025-06-26,43.15999984741211
2025-06-27,42.59999847412109
2025-06-30,42.0099983215332
2025-07-01,42.86000061035156
2025-07-02,43.93000030517578
2025-07-03,43.79999923706055
2025-07-07,43.34999847412109
2025-07-08,45.75
2025-07-09,45.56999969482422
2025-07-10,45.84999847412109
2025-07-11,46.310001373291016
2025-07-14,45.06999969482422
2025-07-15,42.68999862670898
2025-07-16,42.630001068115234
2025-07-17,43.54999923706055
2025-07-18,43.619998931884766
2025-07-21,43.0
2025-07-22,43.560001373291016
2025-07-23,44.43999862670898
2025-07-24,44.630001068115234
2025-07-25,44.709999084472656
2025-07-28,45.54999923706055
2025-07-29,45.459999084472656
2025-07-30,44.40999984741211
2025-07-31,43.93999862670898
2025-08-01,43.40999984741211
2025-08-04,42.86000061035156
2025-08-05,43.08000183105469
2025-08-06,42.540000915527344
2025-08-07,43.59000015258789
2025-08-08,44.31999969482422
2025-08-11,43.709999084472656
2025-08-12,44.150001525878906
2025-08-13,44.75
2025-08-14,44.77000045776367
2025-08-15,44.61000061035156
2025-08-18,44.209999084472656
2025-08-19,43.959999084472656
2025-08-20,44.27000045776367
2025-08-21,44.560001373291016
2025-08-22,45.83000183105469
2025-08-25,46.400001525878906
2025-08-26,46.040000915527344
2025-08-27,46.869998931884766
2025-08-28,47.5099983215332
2025-08-29,47.61000061035156
2025-09-02,48.04999923706055
2025-09-03,46.29999923706055
2025-09-04,46.61000061035156
2025-09-05,45.90999984741211
2025-09-08,45.380001068115234
2025-09-09,45.13999938964844
2025-09-10,46.310001373291016
2025-09-11,46.02000045776367
2025-09-12,45.66999816894531
2025-09-15,45.470001220703125
2025-09-16,47.7599983215332
2025-09-17,47.18999862670898
2025-09-18,47.36000061035156
2025-09-19,46.09999847412109
2025-09-22,45.7599983215332
2025-09-23,46.41999816894531
2025-09-24,46.88999938964844
2025-09-25,46.9900016784668
2025-09-26,47.470001220703125
2025-09-29,48.09999847412109
2025-09-30,47.25
2025-10-01,47.720001220703125
2025-10-02,44.22999954223633
2025-10-03,44.84999847412109
2025-10-06,45.400001525878906
2025-10-07,45.33000183105469
2025-10-08,45.040000915527344
2025-10-09,44.52000045776367
2025-10-10,42.150001525878906
2025-10-13,42.41999816894531

Indicator data:
Answer: -0.1616