Question: 统计信达证券从2024年12月01日到2025年07月27日，股价跌破10日双指数移动平均线的总次数。（平滑系数 alpha 取 2 / (n + 1)；从前 5n 个数据开始计算；初始值用首个数据点）使用不复权价格，写出指标公式，搜集原始数据，计算得出答案，保留四位小数。注意列出原始数据和关键计算过程。
Formula: DEMA = 2 * EMA1 - EMA2；EMA1 = EMA_n(P)；EMA2 = EMA_n(EMA1)
Data:
date,close,high,low
2024-09-12,12.39,12.56,12.39
2024-09-13,12.31,12.54,12.27
2024-09-18,12.32,12.4,12.12
2024-09-19,12.56,12.73,12.27
2024-09-20,12.7,12.7,12.41
2024-09-23,12.57,12.71,12.5
2024-09-24,13.46,13.5,12.55
2024-09-25,13.59,14.09,13.57
2024-09-26,14.35,14.46,13.46
2024-09-27,15.5,15.53,14.6
2024-09-30,17.05,17.05,16.13
2024-10-08,18.76,18.76,17.39
2024-10-09,16.88,18.49,16.88
2024-10-10,15.75,17.15,15.42
2024-10-11,15.62,16.14,15.36
2024-10-14,15.7,16.31,14.91
2024-10-15,15.1,15.69,15.06
2024-10-16,15.11,15.48,14.85
2024-10-17,14.88,15.38,14.87
2024-10-18,15.48,16.12,14.77
2024-10-21,15.17,15.41,15.08
2024-10-22,15.42,15.48,15.11
2024-10-23,15.36,15.67,15.26
2024-10-24,15.51,15.69,15.24
2024-10-25,15.6,15.78,15.31
2024-10-28,15.64,15.67,15.41
2024-10-29,15.21,15.88,15.18
2024-10-30,15.16,15.37,14.97
2024-10-31,15.31,15.68,14.88
2024-11-01,14.94,15.37,14.9
2024-11-04,16.05,16.1,15.03
2024-11-05,16.55,16.66,15.71
2024-11-06,16.48,17.1,16.26
2024-11-07,17.4,17.53,16.18
2024-11-08,16.69,17.68,16.67
2024-11-11,17.05,17.21,16.36
2024-11-12,16.54,17.19,16.33
2024-11-13,16.74,16.97,16.41
2024-11-14,16.29,16.87,16.21
2024-11-15,15.58,16.38,15.57
2024-11-18,15.19,15.7,15.07
2024-11-19,15.56,15.65,15.23
2024-11-20,15.47,15.59,15.37
2024-11-21,15.44,15.57,15.31
2024-11-22,14.71,15.45,14.68
2024-11-25,14.71,14.8,14.45
2024-11-26,14.67,14.98,14.61
2024-11-27,15.02,15.04,14.6
2024-11-28,14.87,15.09,14.84
2024-11-29,15.19,15.5,14.8
2024-12-02,15.39,15.45,14.99
2024-12-03,15.37,15.48,15.18
2024-12-04,15.15,15.45,15.04
2024-12-05,15.38,15.44,15.05
2024-12-06,15.48,15.66,15.23
2024-12-09,15.36,15.55,15.18
2024-12-10,15.6,16.13,15.54
2024-12-11,15.96,16.11,15.53
2024-12-12,16.36,16.68,15.91
2024-12-13,15.73,16.24,15.69
2024-12-16,15.46,15.73,15.35
2024-12-17,15.32,15.51,15.27
2024-12-18,15.27,15.41,15.14
2024-12-19,15.26,15.3,14.99
2024-12-20,15.33,15.47,15.23
2024-12-23,14.93,15.33,14.9
2024-12-24,15.19,15.2,14.95
2024-12-25,15.72,16.08,15.21
2024-12-26,16.11,16.24,15.61
2024-12-27,16.06,16.37,15.91
2024-12-30,16.03,16.19,15.91
2024-12-31,14.98,16.03,14.97
2025-01-02,14.27,14.98,14.12
2025-01-03,13.85,14.37,13.8
2025-01-06,14.05,14.26,13.7
2025-01-07,14.08,14.12,13.81
2025-01-08,13.91,14.08,13.57
2025-01-09,13.76,13.97,13.73
2025-01-10,13.41,13.84,13.41
2025-01-13,13.46,13.54,13.21
2025-01-14,13.9,13.93,13.44
2025-01-15,13.72,13.88,13.67
2025-01-16,13.66,13.94,13.55
2025-01-17,13.63,13.74,13.57
2025-01-20,13.67,13.84,13.62
2025-01-21,13.68,13.8,13.53
2025-01-22,13.65,13.69,13.54
2025-01-23,13.65,14.12,13.65
2025-01-24,13.74,13.77,13.61
2025-01-27,13.27,13.84,13.25
2025-02-05,13.38,13.44,13.27
2025-02-06,13.84,13.92,13.32
2025-02-07,14.03,14.3,13.75
2025-02-10,14.06,14.1,13.96
2025-02-11,13.92,14.06,13.81
2025-02-12,14.12,14.12,13.84
2025-02-13,13.96,14.23,13.91
2025-02-14,14.02,14.11,13.91
2025-02-17,15.04,15.42,14.72
2025-02-18,15.3,16.16,14.55
2025-02-19,16.35,16.83,15.17
2025-02-20,16.57,16.93,15.89
2025-02-21,16.44,16.99,16.16
2025-02-24,16.0,16.53,15.79
2025-02-25,15.83,16.42,15.74
2025-02-26,16.73,16.92,15.68
2025-02-27,16.44,16.68,16.0
2025-02-28,15.8,17.2,15.8
2025-03-03,16.0,16.58,15.79
2025-03-04,15.97,16.24,15.78
2025-03-05,15.89,16.08,15.75
2025-03-06,16.73,17.1,15.84
2025-03-07,16.36,16.85,16.23
2025-03-10,16.13,16.35,16.02
2025-03-11,16.22,16.49,15.95
2025-03-12,16.54,16.95,16.24
2025-03-13,16.78,17.39,16.36
2025-03-14,18.46,18.46,16.8
2025-03-17,17.67,18.46,17.64
2025-03-18,17.87,18.45,17.72
2025-03-19,18.18,18.38,17.7
2025-03-20,17.65,18.02,17.56
2025-03-21,17.49,18.07,17.37
2025-03-24,17.37,17.69,17.08
2025-03-25,16.75,17.3,16.6
2025-03-26,16.61,16.87,16.6
2025-03-27,16.66,16.98,16.35
2025-03-28,16.74,16.99,16.57
2025-03-31,16.2,16.74,16.08
2025-04-01,16.0,16.39,15.88
2025-04-02,15.97,16.12,15.88
2025-04-03,15.91,16.08,15.76
2025-04-07,14.32,15.17,14.32
2025-04-08,14.31,14.65,14.03
2025-04-09,14.5,14.65,13.71
2025-04-10,14.67,14.99,14.59
2025-04-11,15.05,15.27,14.62
2025-04-14,14.95,15.11,14.88
2025-04-15,14.91,14.95,14.79
2025-04-16,14.75,14.92,14.55
2025-04-17,14.73,14.88,14.64
2025-04-18,14.82,14.91,14.65
2025-04-21,14.88,14.9,14.59
2025-04-22,14.85,14.95,14.78
2025-04-23,14.83,15.06,14.76
2025-04-24,15.07,15.43,14.97
2025-04-25,14.94,15.1,14.78
2025-04-28,14.66,14.88,14.6
2025-04-29,14.69,14.77,14.56
2025-04-30,14.55,14.8,14.53
2025-05-06,14.99,14.99,14.6
2025-05-07,15.05,15.7,14.95
2025-05-08,15.13,15.22,14.92
2025-05-09,15.07,15.38,14.96
2025-05-12,15.37,15.42,15.05
2025-05-13,15.12,15.45,15.1
2025-05-14,15.57,15.79,15.0
2025-05-15,15.11,15.46,15.1
2025-05-16,15.15,15.38,15.05
2025-05-19,15.16,15.31,15.0
2025-05-20,15.14,15.22,15.05
2025-05-21,15.06,15.15,15.01
2025-05-22,14.8,15.03,14.74
2025-05-23,14.5,14.86,14.49
2025-05-26,14.53,14.53,14.35
2025-05-27,14.47,14.51,14.38
2025-05-28,14.35,14.5,14.32
2025-05-29,14.56,14.59,14.34
2025-05-30,14.38,14.52,14.38
2025-06-03,14.48,14.56,14.3
2025-06-04,14.64,14.73,14.44
2025-06-05,14.74,14.77,14.6
2025-06-06,14.58,14.78,14.55
2025-06-09,16.04,16.04,15.08
2025-06-10,15.58,16.22,15.48
2025-06-11,16.57,17.14,15.6
2025-06-12,16.31,16.75,16.1
2025-06-13,15.99,16.35,15.91
2025-06-16,16.24,16.3,15.9
2025-06-17,16.74,16.97,16.21
2025-06-18,16.4,16.77,16.26
2025-06-19,15.93,16.46,15.87
2025-06-20,15.77,16.08,15.72
2025-06-23,16.0,16.13,15.64
2025-06-24,16.53,16.76,15.95
2025-06-25,17.58,18.0,16.53
2025-06-26,17.2,17.65,17.05
2025-06-27,16.91,17.51,16.9
2025-06-30,17.1,17.32,16.72
2025-07-01,16.93,17.1,16.8
2025-07-02,16.75,16.95,16.67
2025-07-03,16.8,16.87,16.66
2025-07-04,16.51,17.07,16.5
2025-07-07,16.55,16.67,16.4
2025-07-08,17.0,17.05,16.51
2025-07-09,16.82,17.12,16.73
2025-07-10,16.86,16.98,16.64
2025-07-11,17.13,17.5,16.75
2025-07-14,16.8,17.27,16.73
2025-07-15,16.69,17.05,16.56
2025-07-16,16.66,16.77,16.55
2025-07-17,16.83,16.84,16.62
2025-07-18,16.76,16.87,16.71
2025-07-21,16.89,16.94,16.67
2025-07-22,16.82,16.9,16.58
2025-07-23,16.84,17.17,16.79
2025-07-24,17.14,17.18,16.75
2025-07-25,17.06,17.29,17.03

Indicator data:
date,10日,close
2024-10-17,15.540249893299798,14.88
2024-10-18,15.558758758691972,15.48
2024-10-21,15.466066056725014,15.17
2024-10-22,15.476872890723165,15.42
2024-10-23,15.462392411309594,15.36
2024-10-24,15.498900770997711,15.51
2024-10-25,15.553459234227024,15.6
2024-10-28,15.60474352005071,15.64
2024-10-29,15.498091066096295,15.21
2024-10-30,15.400643024487264,15.16
2024-10-31,15.377040847063457,15.31
2024-11-01,15.236710766405754,14.94
2024-11-04,15.499904323439662,16.05
2024-11-05,15.859565983158571,16.55
2024-11-06,16.10001499559326,16.48
2024-11-07,16.577670450343973,17.4
2024-11-08,16.689896979545892,16.69
2024-11-11,16.884035499770455,17.05
2024-11-12,16.850887385217625,16.54
2024-11-13,16.88453575860895,16.74
2024-11-14,16.753522330594585,16.29
2024-11-15,16.415785330664484,15.58
2024-11-18,16.033142038788483,15.19
2024-11-19,15.871433982614018,15.56
2024-11-20,15.723135730708336,15.47
2024-11-21,15.605576215607563,15.44
2024-11-22,15.28008344217291,14.71
2024-11-25,15.043345851950608,14.71
2024-11-26,14.860625784051363,14.67
2024-11-27,14.847709844910497,15.02
2024-11-28,14.795172403174531,14.87
2024-11-29,14.868261474304191,15.19
2024-12-02,14.993940555827212,15.39
2024-12-03,15.084554137480568,15.37
2024-12-04,15.081921770240895,15.15
2024-12-05,15.158443184890668,15.38
2024-12-06,15.25005030759372,15.48
2024-12-09,15.279306305185226,15.36
2024-12-10,15.380897301748623,15.6
2024-12-11,15.575155826663009,15.96
2024-12-12,15.850150183782127,16.36
2024-12-13,15.842827391976504,15.73
2024-12-16,15.744939328305751,15.46
2024-12-17,15.623710481441666,15.32
2024-12-18,15.515988344898219,15.27
2024-12-19,15.43243920076919,15.26
2024-12-20,15.393949634839206,15.33
2024-12-23,15.233838449883127,14.93
2024-12-24,15.202562749213913,15.19
2024-12-25,15.356417437221666,15.72
2024-12-26,15.600355949450936,16.11
2024-12-27,15.763972442779586,16.06
2024-12-30,15.873369518717626,16.03
2024-12-31,15.604672701164821,14.98
2025-01-02,15.169440196814103,14.27
2025-01-03,14.709509670866463,13.85
2025-01-06,14.439324453633201,14.05
2025-01-07,14.255503789084218,14.08
2025-01-08,14.070450161110626,13.91
2025-01-09,13.891680371769276,13.76
2025-01-10,13.651952483969884,13.41
2025-01-13,13.500003981096906,13.46
2025-01-14,13.542418488063031,13.9
2025-01-15,13.523128414608516,13.72
2025-01-16,13.496888665780011,13.66
2025-01-17,13.474797968935142,13.63
2025-01-20,13.478363767941957,13.67
2025-01-21,13.490391657593067,13.68
2025-01-22,13.494794074381232,13.65
2025-01-23,13.502871921177235,13.65
2025-01-24,13.542895209654649,13.74
2025-01-27,13.42083161897739,13.27
2025-02-05,13.370497095665266,13.38
2025-02-06,13.489182345492178,13.84
2025-02-07,13.64303999717822,14.03
2025-02-10,13.76874503682993,14.06
2025-02-11,13.816241962982566,13.92
2025-02-12,13.917583146176229,14.12
2025-02-13,13.93922201604385,13.96
2025-02-14,13.974229126747169,14.02
2025-02-17,14.336366808234608,15.04
2025-02-18,14.688000568296957,15.3
2025-02-19,15.290730587237968,16.35
2025-02-20,15.80195545653772,16.57
2025-02-21,16.12659506469581,16.44
2025-02-24,16.208821742398474,16.0
2025-02-25,16.200764502103613,15.83
2025-02-26,16.480634795720988,16.73
2025-02-27,16.58036169324266,16.44
2025-02-28,16.430910717426837,15.8
2025-03-03,16.37612417270957,16.0
2025-03-04,16.317097670123317,15.97
2025-03-05,16.239663476817697,15.89
2025-03-06,16.453954191156328,16.73
2025-03-07,16.484216431625782,16.36
2025-03-10,16.424335239489604,16.13
2025-03-11,16.404271458324402,16.22
2025-03-12,16.490533837599788,16.54
2025-03-13,16.629253815871746,16.78
2025-03-14,17.282471195843165,18.46
2025-03-17,17.49751849331682,17.67
2025-03-18,17.71329334556557,17.87
2025-03-19,17.965397392258843,18.18
2025-03-20,17.96604894773918,17.65
2025-03-21,17.90314465189579,17.49
2025-03-24,17.807708068665235,17.37
2025-03-25,17.524392403240967,16.75
2025-03-26,17.26285406842833,16.61
2025-03-27,17.082721660217278,16.66
2025-03-28,16.974609166779555,16.74
2025-03-31,16.715968268964897,16.2
2025-04-01,16.459655989635582,16.0
2025-04-02,16.262962447617262,15.97
2025-04-03,16.101772144361455,15.91
2025-04-07,15.46190848203777,14.32
2025-04-08,14.99251517148926,14.31
2025-04-09,14.718540635618297,14.5
2025-04-10,14.584110057535476,14.67
2025-04-11,14.622578511627623,15.05
2025-04-14,14.62940190613137,14.95
2025-04-15,14.631344776629534,14.91
2025-04-16,14.588964556826504,14.75
2025-04-17,14.559306242517811,14.73
2025-04-18,14.574847164591574,14.82
2025-04-21,14.613189528472631,14.88
2025-04-22,14.637759556245156,14.85
2025-04-23,14.654611903555846,14.83
2025-04-24,14.751030023538844,15.07
2025-04-25,14.78314364026998,14.94
2025-04-28,14.717264536089337,14.66
2025-04-29,14.681187961023307,14.69
2025-04-30,14.611047841813049,14.55
2025-05-06,14.707530973852027,14.99
2025-05-07,14.801291385420202,15.05
2025-05-08,14.89872467298501,15.13
2025-05-09,14.951759363900788,15.07
2025-05-12,15.090344260665871,15.37
2025-05-13,15.109716158147755,15.12
2025-05-14,15.271784414870414,15.57
2025-05-15,15.238068639127054,15.11
2025-05-16,15.224488040848376,15.15
2025-05-19,15.216240267096584,15.16
2025-05-20,15.202248277490952,15.14
2025-05-21,15.164377663705665,15.06
2025-05-22,15.049625346586403,14.8
2025-05-23,14.865382048462386,14.5
2025-05-26,14.73988423571945,14.53
2025-05-27,14.629100270636348,14.47
2025-05-28,14.510010169361337,14.35
2025-05-29,14.494420591834713,14.56
2025-05-30,14.426648375743842,14.38
2025-06-03,14.412795954203876,14.48
2025-06-04,14.458637028901787,14.64
2025-06-05,14.528377350678014,14.74
2025-06-06,14.529166248704147,14.58
2025-06-09,15.014019436681838,16.04
2025-06-10,15.220441176181556,15.58
2025-06-11,15.697783293493542,16.57
2025-06-12,15.960209560669549,16.31
2025-06-13,16.0416615391702,15.99
2025-06-16,16.17712405240881,16.24
2025-06-17,16.435173369455853,16.74
2025-06-18,16.505597346340043,16.4
2025-06-19,16.39387794751574,15.93
2025-06-20,16.25086321119482,15.77
2025-06-23,16.215262827006597,16.0
2025-06-24,16.359521649921714,16.53
2025-06-25,16.808834691710448,17.58
2025-06-26,17.009487729876117,17.2
2025-06-27,17.05423934286715,16.91
2025-06-30,17.142238708824213,17.1
2025-07-01,17.143552707231034,16.93
2025-07-02,17.07786860014036,16.75
2025-07-03,17.039588541670064,16.8
2025-07-04,16.910174997019034,16.51
2025-07-07,16.823537004417304,16.55
2025-07-08,16.90525745550483,17.0
2025-07-09,16.903590734150036,16.82
2025-07-10,16.91293480550261,16.86
2025-07-11,17.00669621506912,17.13
2025-07-14,16.964447366429546,16.8
2025-07-15,16.894365166383896,16.69
2025-07-16,16.830777407134036,16.66
2025-07-17,16.838763207730935,16.83
2025-07-18,16.820678885560895,16.76
2025-07-21,16.84954214475084,16.89
2025-07-22,16.84706078454738,16.82
2025-07-23,16.851116707566643,16.84
2025-07-24,16.9526378888418,17.14
2025-07-25,17.00034585684114,17.06

Answer: 19.0