我有一些每月资产收益的数据，我想将这些资产合并到投资组合中。我想为每个月计算该月持有的所有资产的回报。
通过计算收益，我得到了两个不同的结果。
我运行以下代码：
方法1：
mean(data[data$date == "2007-06-29",]$monthly.returns)
Output1
[1] 0.1061636
方法2：
data %>%
tq_portfolio(assets_col = ID,
returns_col = monthly.returns,
col_rename = "returns",
rebalance_on = "months") %>%
filter(date == "2007-06-29")
Output2
# A tibble: 1 x 2
date returns
<date> <dbl>
1 2007-06-29 0.0212
方法3：
data %>%
group_by(date) %>%
summarise(ave_month_ret = mean(monthly.returns)) %>%
filter(date == "2007-06-29")
# A tibble: 1 x 2
date ave_month_ret
<date> <dbl>
1 2007-06-29 0.106
与方法1一致。我只是不知道方法2在使用什么计算方法...
返回值要小得多……而且我使用的是相同的数据/代码。
编辑 新数据：
data <- structure(list(ID = c("94106L10", "94106L10", "94106L10", "94106L10",
"94106L10", "94106L10", "94106L10", "94106L10", "94106L10", "94106L10",
"94106L10", "94106L10", "12526910", "12526910", "12526910", "12526910",
"12526910", "12526910", "12526910", "12526910", "12526910", "12526910",
"12526910", "12526910", "50540R40", "50540R40", "50540R40", "50540R40",
"50540R40", "50540R40", "50540R40", "50540R40", "50540R40", "50540R40",
"50540R40", "50540R40", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "12526910", "12526910", "12526910", "12526910",
"12526910", "12526910", "12526910", "12526910", "12526910", "12526910",
"12526910", "12526910", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "12526910", "12526910", "12526910", "12526910",
"12526910", "12526910", "12526910", "12526910", "12526910", "12526910",
"12526910", "12526910", "48116510", "48116510", "48116510", "48116510",
"48116510", "48116510", "48116510", "48116510", "48116510", "48116510",
"48116510", "48116510", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "12526910", "12526910", "12526910", "12526910",
"12526910", "12526910", "12526910", "12526910", "12526910", "12526910",
"12526910", "12526910", "58283910", "58283910", "58283910", "58283910",
"58283910", "58283910", "58283910", "58283910", "58283910", "58283910",
"58283910", "58283910", "48116510", "48116510", "48116510", "48116510",
"48116510", "48116510", "48116510", "48116510", "48116510", "48116510",
"48116510", "48116510", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "48116510", "48116510", "48116510", "48116510",
"48116510", "48116510", "48116510", "48116510", "48116510", "48116510",
"48116510", "48116510", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "58943310", "58943310", "58943310", "58943310",
"58943310", "58943310", "58943310", "58943310", "58943310", "58943310",
"58943310", "58943310", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "58283910", "58283910", "58283910", "58283910",
"58283910", "58283910", "58283910", "58283910", "58283910", "58283910",
"58283910", "58283910", "90781810", "90781810", "90781810", "90781810",
"90781810", "90781810", "90781810", "90781810", "90781810", "90781810",
"90781810", "90781810", "22207020", "22207020", "22207020", "22207020",
"22207020", "22207020", "22207020", "22207020", "22207020", "22207020",
"22207020", "22207020", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "11012210", "11012210", "11012210", "11012210",
"11012210", "11012210", "11012210", "74144T10", "74144T10", "74144T10",
"74144T10", "74144T10", "74144T10", "74144T10", "12526910", "12526910",
"12526910", "12526910", "12526910", "12526910", "12526910"),
date = structure(c(13693, 13725, 13756, 13784, 13817, 13847,
13878, 13909, 13938, 13969, 13999, 14029, 13693, 13725, 13756,
13784, 13817, 13847, 13878, 13909, 13938, 13969, 13999, 14029,
14425, 14456, 14487, 14517, 14547, 14578, 14609, 14638, 14666,
14699, 14729, 14757, 14425, 14456, 14487, 14517, 14547, 14578,
14609, 14638, 14666, 14699, 14729, 14757, 14425, 14456, 14487,
14517, 14547, 14578, 14609, 14638, 14666, 14699, 14729, 14757,
14790, 14820, 14852, 14882, 14911, 14943, 14974, 15005, 15033,
15064, 15093, 15121, 14790, 14820, 14852, 14882, 14911, 14943,
14974, 15005, 15033, 15064, 15093, 15121, 15155, 15184, 15217,
15247, 15278, 15308, 15338, 15370, 15399, 15429, 15460, 15490,
15520, 15552, 15583, 15611, 15644, 15674, 15705, 15736, 15764,
15792, 15825, 15855, 15520, 15552, 15583, 15611, 15644, 15674,
15705, 15736, 15764, 15792, 15825, 15855, 15884, 15917, 15947,
15978, 16009, 16038, 16070, 16101, 16129, 16160, 16190, 16220,
15884, 15917, 15947, 15978, 16009, 16038, 16070, 16101, 16129,
16160, 16190, 16220, 15884, 15917, 15947, 15978, 16009, 16038,
16070, 16101, 16129, 16160, 16190, 16220, 15884, 15917, 15947,
15978, 16009, 16038, 16070, 16101, 16129, 16160, 16190, 16220,
15884, 15917, 15947, 15978, 16009, 16038, 16070, 16101, 16129,
16160, 16190, 16220, 16251, 16282, 16311, 16343, 16374, 16402,
16435, 16465, 16493, 16525, 16555, 16584, 16251, 16282, 16311,
16343, 16374, 16402, 16435, 16465, 16493, 16525, 16555, 16584,
16251, 16282, 16311, 16343, 16374, 16402, 16435, 16465, 16493,
16525, 16555, 16584, 16616, 16647, 16678, 16708, 16738, 16769,
16800, 16829, 16860, 16891, 16920, 16948, 16616, 16647, 16678,
16708, 16738, 16769, 16800, 16829, 16860, 16891, 16920, 16948,
16616, 16647, 16678, 16708, 16738, 16769, 16800, 16829, 16860,
16891, 16920, 16948, 16982, 17011, 17044, 17074, 17105, 17135,
17165, 17197, 17225, 17256, 17284, 17316, 16982, 17011, 17044,
17074, 17105, 17135, 17165, 17197, 17225, 17256, 17284, 17316,
16982, 17011, 17044, 17074, 17105, 17135, 17165, 17197, 17225,
17256, 17284, 17316, 17347, 17378, 17409, 17438, 17470, 17500,
17529, 17562, 17590, 17619, 17651, 17681, 17347, 17378, 17409,
17438, 17470, 17500, 17529, 17562, 17590, 17619, 17651, 17681,
17347, 17378, 17409, 17438, 17470, 17500, 17529, 17562, 17590,
17619, 17651, 17681, 17711, 17743, 17774, 17802, 17835, 17865,
17896, 17711, 17743, 17774, 17802, 17835, 17865, 17896, 17711,
17743, 17774, 17802, 17835, 17865, 17896), class = "Date"),
monthly.returns = c(-0.0227727694760084, -0.0261203707475507,
-0.00946622723920743, 0.00185833588861728, -0.0357711242389441,
-0.0568837518423548, -0.0480769679647677, -0.00795832066438062,
0.0129590245485958, 0.0222357447920023, 0.0756852502053702,
0.0506925736400397, 0.23509996528303, -0.0402404386704445,
0.101774570901307, 0.198642056960844, 0.157950168427595,
0.0350398381978172, 0.209716349721439, -0.0284390089301215,
0.141681487726935, -0.151212310022894, 0.29029138587484,
0.0239341587231359, 0.0962160534970569, -0.00885084033069661,
0.0386962104427435, -0.0586044406595664, 0.0485540729007834,
0.0590796883565639, 0.025767506537949, -0.0499732502241718,
0.031082969506351, 0.0327377111690756, 0.0377757316726486,
-0.0376734007378084, -0.006674674348077, 0.120950351259758,
-0.0301862529447343, 0.00883005590763375, 0.0663019415473178,
0.00410426359159222, 0.0882893862227756, -0.0681690341430085,
0.0215638798439521, 0.084434853224457, 0.0467527676505903,
-0.139381305703097, -0.0722062821678602, 0.0647424209775214,
0.0344565636759657, 0.0559637458961404, -0.0345587758427702,
0.0253453526768961, 0.0634957606629634, 0.0229125562791819,
0.144087843694531, -0.14175449794253, -0.0823645767832291,
-0.180231889100862, 0.0843478493068521, -0.000801942956512258,
0.0465489503956982, 0.0394938914746412, -0.00774625551801411,
-0.0617100323774203, 0.0491283590476501, -0.0490936276258981,
0.0250198233967893, 0.0240217300295384, 0.0631857758990213,
0.0131672215965088, -0.113795183581069, 0.0865059744398955,
-0.0920588569116774, 0.143297501255742, 0.103964885125911,
0.0553645982983011, 0.106463207432413, 0.0213820457676193,
0.0160801762353151, -0.00836078172471943, -0.032670855597221,
-0.0281712275998599, 0.00717743792807513, -0.058667565571353,
-0.0584506996376505, -0.106768869359527, 0.106133549220015,
0.0741861876916237, 0.00334747087781739, 0.015627732708084,
0.0648340247252268, 0.0602370983922462, -0.0334609689307233,
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0.0113580020857449, 0.0302734481107707, 0.0249604744929042,
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0.0479306607738461, -0.117744305824932, -0.121590678763565,
0.0312870286274094)), row.names = c(NA, -345L), class = c("tbl_df",
"tbl", "data.frame"))