Question: For Annualized Volatility, what is Equinix's value from January 19, 2021 to October 10, 2021? (252 trading days per year; unit: %) 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: r_t = P_t / P_{t-1} - 1; AnnVol = \sigma(r) * \sqrt{252} * 100%
Data:
date,close
2021-01-15,707.760009765625
2021-01-19,716.3200073242188
2021-01-20,727.739990234375
2021-01-21,719.9000244140625
2021-01-22,721.1599731445312
2021-01-25,723.1599731445312
2021-01-26,735.239990234375
2021-01-27,731.7000122070312
2021-01-28,738.22998046875
2021-01-29,739.9600219726562
2021-02-01,756.719970703125
2021-02-02,768.5700073242188
2021-02-03,754.8900146484375
2021-02-04,746.9099731445312
2021-02-05,754.2899780273438
2021-02-08,747.4099731445312
2021-02-09,750.469970703125
2021-02-10,751.0
2021-02-11,717.7000122070312
2021-02-12,709.8099975585938
2021-02-16,688.0900268554688
2021-02-17,694.4299926757812
2021-02-18,685.5599975585938
2021-02-19,680.219970703125
2021-02-22,667.3400268554688
2021-02-23,658.8200073242188
2021-02-24,639.0
2021-02-25,638.3699951171875
2021-02-26,648.3400268554688
2021-03-01,648.260009765625
2021-03-02,640.0499877929688
2021-03-03,611.3400268554688
2021-03-04,603.5700073242188
2021-03-05,610.5599975585938
2021-03-08,594.9199829101562
2021-03-09,622.7100219726562
2021-03-10,638.7000122070312
2021-03-11,654.5900268554688
2021-03-12,668.0
2021-03-15,669.5499877929688
2021-03-16,671.3300170898438
2021-03-17,656.4500122070312
2021-03-18,646.8300170898438
2021-03-19,653.0599975585938
2021-03-22,666.6900024414062
2021-03-23,675.77001953125
2021-03-24,662.3400268554688
2021-03-25,668.1199951171875
2021-03-26,683.6300048828125
2021-03-29,687.8400268554688
2021-03-30,674.8400268554688
2021-03-31,679.5900268554688
2021-04-01,678.0
2021-04-05,690.239990234375
2021-04-06,688.7100219726562
2021-04-07,684.4500122070312
2021-04-08,687.6900024414062
2021-04-09,687.4600219726562
2021-04-12,691.4299926757812
2021-04-13,705.77001953125
2021-04-14,694.3099975585938
2021-04-15,718.8499755859375
2021-04-16,708.1400146484375
2021-04-19,717.2899780273438
2021-04-20,726.219970703125
2021-04-21,726.1300048828125
2021-04-22,717.969970703125
2021-04-23,718.1099853515625
2021-04-26,716.969970703125
2021-04-27,713.8800048828125
2021-04-28,707.3800048828125
2021-04-29,706.0800170898438
2021-04-30,720.760009765625
2021-05-03,711.0499877929688
2021-05-04,710.030029296875
2021-05-05,693.0
2021-05-06,699.0800170898438
2021-05-07,713.4500122070312
2021-05-10,720.0
2021-05-11,718.0399780273438
2021-05-12,705.3599853515625
2021-05-13,715.4299926757812
2021-05-14,722.02001953125
2021-05-17,715.030029296875
2021-05-18,715.3300170898438
2021-05-19,715.3599853515625
2021-05-20,728.1199951171875
2021-05-21,725.219970703125
2021-05-24,723.2999877929688
2021-05-25,735.260009765625
2021-05-26,735.3900146484375
2021-05-27,735.0900268554688
2021-05-28,736.719970703125
2021-06-01,739.4199829101562
2021-06-02,758.1300048828125
2021-06-03,777.0399780273438
2021-06-04,785.3900146484375
2021-06-07,795.0599975585938
2021-06-08,816.6599731445312
2021-06-09,810.010009765625
2021-06-10,822.989990234375
2021-06-11,816.0399780273438
2021-06-14,823.989990234375
2021-06-15,809.0
2021-06-16,809.969970703125
2021-06-17,815.4600219726562
2021-06-18,822.77001953125
2021-06-21,822.5
2021-06-22,822.5700073242188
2021-06-23,803.5599975585938
2021-06-24,779.3200073242188
2021-06-25,783.4000244140625
2021-06-28,798.52001953125
2021-06-29,802.3300170898438
2021-06-30,802.5999755859375
2021-07-01,797.6400146484375
2021-07-02,800.5
2021-07-06,819.1099853515625
2021-07-07,827.8099975585938
2021-07-08,828.1900024414062
2021-07-09,820.3200073242188
2021-07-12,829.5499877929688
2021-07-13,823.0399780273438
2021-07-14,831.8400268554688
2021-07-15,834.0399780273438
2021-07-16,831.469970703125
2021-07-19,834.2999877929688
2021-07-20,832.6500244140625
2021-07-21,819.760009765625
2021-07-22,820.8200073242188
2021-07-23,833.47998046875
2021-07-26,829.510009765625
2021-07-27,841.8300170898438
2021-07-28,836.3099975585938
2021-07-29,786.3800048828125
2021-07-30,820.4099731445312
2021-08-02,818.989990234375
2021-08-03,820.3099975585938
2021-08-04,828.3400268554688
2021-08-05,830.6199951171875
2021-08-06,820.1500244140625
2021-08-09,814.989990234375
2021-08-10,797.969970703125
2021-08-11,806.8800048828125
2021-08-12,811.719970703125
2021-08-13,814.0900268554688
2021-08-16,822.9400024414062
2021-08-17,827.8099975585938
2021-08-18,814.27001953125
2021-08-19,833.9600219726562
2021-08-20,835.6300048828125
2021-08-23,835.5700073242188
2021-08-24,820.239990234375
2021-08-25,807.530029296875
2021-08-26,824.989990234375
2021-08-27,824.8099975585938
2021-08-30,840.030029296875
2021-08-31,843.4500122070312
2021-09-01,868.8400268554688
2021-09-02,874.4299926757812
2021-09-03,882.8300170898438
2021-09-07,881.760009765625
2021-09-08,882.3099975585938
2021-09-09,854.5599975585938
2021-09-10,844.0
2021-09-13,839.5399780273438
2021-09-14,834.8900146484375
2021-09-15,843.4400024414062
2021-09-16,853.25
2021-09-17,872.5800170898438
2021-09-20,850.22998046875
2021-09-21,848.2000122070312
2021-09-22,860.1199951171875
2021-09-23,848.010009765625
2021-09-24,834.6799926757812
2021-09-27,807.530029296875
2021-09-28,798.9400024414062
2021-09-29,801.5800170898438
2021-09-30,790.1300048828125
2021-10-01,789.3200073242188
2021-10-04,785.6099853515625
2021-10-05,760.0700073242188
2021-10-06,762.3200073242188
2021-10-07,766.489990234375
2021-10-08,750.9600219726562

Indicator data:
Answer: 25.2698