FinCoSkew
Updated 2023-10-09 15:55:32.537000
Syntax
SELECT [westclintech].[wct].[FinCoSkew](
<@Ra, float,>
,<@Rb, float,>)
Description
Use the aggregate function FinCoSkew to calculate the coskewness of an asset return and a benchmark return. FinCoSkew is calculated as:
Where
Ra = asset returnRb = benchmark returnRa = average asset returnRb = average benchmark returnn = number of observations
Arguments
@ Rb
the benchmark return for a period; the percentage return in floating point format (i.e. 10% = 0.10). @Rb is an expression of type float or of a type that can be implicitly converted to float.
@Ra
the asset return for a period; the percentage return in floating point format (i.e. 10% = 0.10). @Ra is an expression of type float or of a type that can be implicitly converted to float.
Return Type
float
Remarks
If @Ra IS NULL or @Rb IS NULL then that row is not included in the calculation.
If n = 0 then NULL is returned.
Examples
In this example we have returns for an asset and its benchmark for the last three years.
SELECT wct.FinCoSkew(Ra, Rb) as FinCoSkew
FROM
(
VALUES
('2012-12-31', 0.001378, -0.003929),
('2013-01-31', 0.028677, -0.001701),
('2013-02-28', 0.005801, 0.003165),
('2013-03-31', 0.01442, -0.006487),
('2013-04-30', 0.00229, -0.004653),
('2013-05-31', 0.014905, 0.009577),
('2013-06-30', 0.008594, 0.00588),
('2013-07-31', 0.011531, 0.005089),
('2013-08-31', 0.008268, 0.005233),
('2013-09-30', 0.013993, -0.004338),
('2013-10-31', 0.009147, -0.006109),
('2013-11-30', -0.00316, -0.002222),
('2013-12-31', -0.00595, 0.005451),
('2014-01-31', 0.013398, -0.008099),
('2014-02-28', 0.002847, -0.000299),
('2014-03-31', -0.009544, -0.009809),
('2014-04-30', 0.002516, 0.008875),
('2014-05-31', 0.004626, -0.002681),
('2014-06-30', -0.002141, 0.000312),
('2014-07-31', 0.009247, 0.00936),
('2014-08-31', -0.01253, 0.005434),
('2014-09-30', 0.00441, 0.008157),
('2014-10-31', 0.01626, -0.006766),
('2014-11-30', 0.013207, 0.005742),
('2014-12-31', -0.008561, -0.005063),
('2015-01-31', 0.012357, 0.004357),
('2015-02-28', -0.002057, -0.00044),
('2015-03-31', 0.008217, -0.004866),
('2015-04-30', -0.013439, -0.007649),
('2015-05-31', 0.004391, -0.002073),
('2015-06-30', -0.008997, 0.00399),
('2015-07-31', -0.001878, -0.00613),
('2015-08-31', -0.014381, -0.00351),
('2015-09-30', -0.001885, 0.001172),
('2015-10-31', -0.001121, -0.000024),
('2015-11-30', 0.000816, 0.002596),
('2015-12-31', -0.003088, -0.009025)
) n (dt, Ra, Rb);
This produces the following result.
{"columns":[{"field":"FinCoSkew","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"FinCoSkew":"1.77056901645221E-08"}]}
In this example we have 6 managers plus a benchmark stored in the #managers table which is in 'spreadsheet' format.
SELECT *
INTO #managers
FROM ( VALUES ('2012-12-31', -0.002546, NULL, NULL, 0.003006, NULL, 0.005007, -0.001839),
('2013-01-31', 0.00977, NULL, NULL, 0.001, NULL, -0.007579, 0.008614),
('2013-02-28', 0.024726, NULL, NULL, 0.005703, NULL, 0.006496, -0.004624),
('2013-03-31', 0.000942, NULL, NULL, 0.007578, NULL, 0.008333, 0.005031),
('2013-04-30', 0.022139, NULL, NULL, 0.007118, NULL, -0.007312, -0.005431),
('2013-05-31', 0.019449, NULL, NULL, 0.005659, NULL, -0.003902, -0.001878),
('2013-06-30', -0.007964, NULL, NULL, 0.003757, NULL, -0.001899, -0.00706),
('2013-07-31', -0.008262, -0.002824, NULL, 0.003762, NULL, -0.007347, -0.001982),
('2013-08-31', 0.009617, 0.007319, NULL, 0.0022, NULL, -0.002116, 0.003867),
('2013-09-30', -0.004118, 0.004128, NULL, 0.001394, NULL, 0.008333, 0.001356),
('2013-10-31', 0.010754, -0.001578, NULL, 0.003483, NULL, -0.004724, -0.001342),
('2013-11-30', 0.002402, 0.020835, NULL, 0.001, NULL, 0.003954, -0.000306),
('2013-12-31', 0.004581, 0.015689, NULL, 0.002146, NULL, 0.008333, 0.001118),
('2014-01-31', -0.00055, -0.001027, -0.008245, 0.00732, NULL, 0.004025, -0.007227),
('2014-02-28', -0.001512, 0.001653, -0.009029, 0.009919, NULL, -0.008333, -0.003878),
('2014-03-31', 0.008784, 0.004364, -0.011608, 0.001, NULL, -0.008333, -0.004822),
('2014-04-30', 0.008412, -0.012369, -0.004692, 0.004536, NULL, -0.006303, 0.004306),
('2014-05-31', 0.003945, 0.010651, -0.016833, 0.001, NULL, -0.007974, 0.005221),
('2014-06-30', 0.012371, 0.01773, -0.010384, 0.010593, NULL, -0.004781, -0.000731),
('2014-07-31', 0.011915, 0.004308, -0.012965, 0.001, NULL, 0.007751, -0.009239),
('2014-08-31', -0.013738, 0.00039, 0.000009, 0.005139, 0.001, -0.003319, -0.003636),
('2014-09-30', -0.004081, 0.01968, -0.008214, 0.007976, 0.001, -0.003799, 0.005563),
('2014-10-31', 0.01608, 0.015291, -0.002969, 0.01303, 0.001, -0.004645, 0.001599),
('2014-11-30', 0.011241, 0.012312, 0.007088, 0.00384, 0.000852, 0.006783, -0.008487),
('2014-12-31', -0.004251, 0.008737, -0.013576, 0.001, 0.001, -0.0034, 0.001013),
('2015-01-31', -0.004039, 0.012938, -0.011891, 0.004576, 0.001, -0.004195, -0.002653),
('2015-02-28', 0.026326, 0.019695, -0.013178, 0.010737, 0.001, 0.006418, -0.00952),
('2015-03-31', -0.000628, 0.008029, 0.005917, 0.017461, 0.00048, -0.00501, 0.007879),
('2015-04-30', 0.005688, 0.01249, -0.018813, 0.001, -0.002104, 0.003657, 0.009886),
('2015-05-31', 0.010039, 0.008442, -0.01465, 0.001, 0.001, 0.001024, 0.001695),
('2015-06-30', -0.004267, 0.001391, -0.022504, 0.003104, 0.001, -0.003507, 0.009854),
('2015-07-31', -0.001672, 0.020558, -0.011859, 0.001, 0.001, NULL, 0.008361),
('2015-08-31', 0.015726, 0.017419, -0.004556, 0.001, -0.000462, NULL, -0.007253),
('2015-09-30', 0.001977, 0.007301, -0.00811, 0.013011, -0.001032, NULL, 0.009911),
('2015-10-31', 0.016201, 0.00877, -0.005536, 0.014527, -0.000833, NULL, 0.009897),
('2015-11-30', 0.019996, -0.000785, -0.002161, 0.001947, 0.001, NULL, -0.007307),
('2015-12-31', -0.003254, 0.009595, -0.013785, 0.001, 0.001, NULL, 0.007196)) n (dt, man1, man2,
man3, man4, man5,
man6, bmark);
To calculate the coskewness for each manager against the benchmark we run the following SQL.
SELECT wct.FinCoSkew(man1, bmark) as man1,
wct.FinCoSkew(man2, bmark) as man2,
wct.FinCoSkew(man3, bmark) as man3,
wct.FinCoSkew(man4, bmark) as man4,
wct.FinCoSkew(man5, bmark) as man5,
wct.FinCoSkew(man6, bmark) as man6
FROM #managers;
This produces the following result.
{"columns":[{"field":"man1","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"man2","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"man3","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"man4","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"man5","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"},{"field":"man6","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"man1":"6.11485619814116E-08","man2":"1.85340757111934E-08","man3":"-2.76612489908329E-09","man4":"2.37724649476171E-08","man5":"-8.70823033006535E-09","man6":"3.1025905253203E-08"}]}
Using the same data from the previous example in the #nmanagers table which is in 3rd normal form we perform the same calculation.
SELECT *
INTO #nmanagers
FROM
(
VALUES
('2012-12-31', 'man1', -0.002546),
('2012-12-31', 'man4', 0.003006),
('2012-12-31', 'man6', 0.005007),
('2012-12-31', 'bmark', -0.001839),
('2013-01-31', 'man1', 0.009770),
('2013-01-31', 'man4', 0.001000),
('2013-01-31', 'man6', -0.007579),
('2013-01-31', 'bmark', 0.008614),
('2013-02-28', 'man1', 0.024726),
('2013-02-28', 'man4', 0.005703),
('2013-02-28', 'man6', 0.006496),
('2013-02-28', 'bmark', -0.004624),
('2013-03-31', 'man1', 0.000942),
('2013-03-31', 'man4', 0.007578),
('2013-03-31', 'man6', 0.008333),
('2013-03-31', 'bmark', 0.005031),
('2013-04-30', 'man1', 0.022139),
('2013-04-30', 'man4', 0.007118),
('2013-04-30', 'man6', -0.007312),
('2013-04-30', 'bmark', -0.005431),
('2013-05-31', 'man1', 0.019449),
('2013-05-31', 'man4', 0.005659),
('2013-05-31', 'man6', -0.003902),
('2013-05-31', 'bmark', -0.001878),
('2013-06-30', 'man1', -0.007964),
('2013-06-30', 'man4', 0.003757),
('2013-06-30', 'man6', -0.001899),
('2013-06-30', 'bmark', -0.007060),
('2013-07-31', 'man1', -0.008262),
('2013-07-31', 'man2', -0.002824),
('2013-07-31', 'man4', 0.003762),
('2013-07-31', 'man6', -0.007347),
('2013-07-31', 'bmark', -0.001982),
('2013-08-31', 'man1', 0.009617),
('2013-08-31', 'man2', 0.007319),
('2013-08-31', 'man4', 0.002200),
('2013-08-31', 'man6', -0.002116),
('2013-08-31', 'bmark', 0.003867),
('2013-09-30', 'man1', -0.004118),
('2013-09-30', 'man2', 0.004128),
('2013-09-30', 'man4', 0.001394),
('2013-09-30', 'man6', 0.008333),
('2013-09-30', 'bmark', 0.001356),
('2013-10-31', 'man1', 0.010754),
('2013-10-31', 'man2', -0.001578),
('2013-10-31', 'man4', 0.003483),
('2013-10-31', 'man6', -0.004724),
('2013-10-31', 'bmark', -0.001342),
('2013-11-30', 'man1', 0.002402),
('2013-11-30', 'man2', 0.020835),
('2013-11-30', 'man4', 0.001000),
('2013-11-30', 'man6', 0.003954),
('2013-11-30', 'bmark', -0.000306),
('2013-12-31', 'man1', 0.004581),
('2013-12-31', 'man2', 0.015689),
('2013-12-31', 'man4', 0.002146),
('2013-12-31', 'man6', 0.008333),
('2013-12-31', 'bmark', 0.001118),
('2014-01-31', 'man1', -0.000550),
('2014-01-31', 'man2', -0.001027),
('2014-01-31', 'man3', -0.008245),
('2014-01-31', 'man4', 0.007320),
('2014-01-31', 'man6', 0.004025),
('2014-01-31', 'bmark', -0.007227),
('2014-02-28', 'man1', -0.001512),
('2014-02-28', 'man2', 0.001653),
('2014-02-28', 'man3', -0.009029),
('2014-02-28', 'man4', 0.009919),
('2014-02-28', 'man6', -0.008333),
('2014-02-28', 'bmark', -0.003878),
('2014-03-31', 'man1', 0.008784),
('2014-03-31', 'man2', 0.004364),
('2014-03-31', 'man3', -0.011608),
('2014-03-31', 'man4', 0.001000),
('2014-03-31', 'man6', -0.008333),
('2014-03-31', 'bmark', -0.004822),
('2014-04-30', 'man1', 0.008412),
('2014-04-30', 'man2', -0.012369),
('2014-04-30', 'man3', -0.004692),
('2014-04-30', 'man4', 0.004536),
('2014-04-30', 'man6', -0.006303),
('2014-04-30', 'bmark', 0.004306),
('2014-05-31', 'man1', 0.003945),
('2014-05-31', 'man2', 0.010651),
('2014-05-31', 'man3', -0.016833),
('2014-05-31', 'man4', 0.001000),
('2014-05-31', 'man6', -0.007974),
('2014-05-31', 'bmark', 0.005221),
('2014-06-30', 'man1', 0.012371),
('2014-06-30', 'man2', 0.017730),
('2014-06-30', 'man3', -0.010384),
('2014-06-30', 'man4', 0.010593),
('2014-06-30', 'man6', -0.004781),
('2014-06-30', 'bmark', -0.000731),
('2014-07-31', 'man1', 0.011915),
('2014-07-31', 'man2', 0.004308),
('2014-07-31', 'man3', -0.012965),
('2014-07-31', 'man4', 0.001000),
('2014-07-31', 'man6', 0.007751),
('2014-07-31', 'bmark', -0.009239),
('2014-08-31', 'man1', -0.013738),
('2014-08-31', 'man2', 0.000390),
('2014-08-31', 'man3', 0.000009),
('2014-08-31', 'man4', 0.005139),
('2014-08-31', 'man5', 0.001000),
('2014-08-31', 'man6', -0.003319),
('2014-08-31', 'bmark', -0.003636),
('2014-09-30', 'man1', -0.004081),
('2014-09-30', 'man2', 0.019680),
('2014-09-30', 'man3', -0.008214),
('2014-09-30', 'man4', 0.007976),
('2014-09-30', 'man5', 0.001000),
('2014-09-30', 'man6', -0.003799),
('2014-09-30', 'bmark', 0.005563),
('2014-10-31', 'man1', 0.016080),
('2014-10-31', 'man2', 0.015291),
('2014-10-31', 'man3', -0.002969),
('2014-10-31', 'man4', 0.013030),
('2014-10-31', 'man5', 0.001000),
('2014-10-31', 'man6', -0.004645),
('2014-10-31', 'bmark', 0.001599),
('2014-11-30', 'man1', 0.011241),
('2014-11-30', 'man2', 0.012312),
('2014-11-30', 'man3', 0.007088),
('2014-11-30', 'man4', 0.003840),
('2014-11-30', 'man5', 0.000852),
('2014-11-30', 'man6', 0.006783),
('2014-11-30', 'bmark', -0.008487),
('2014-12-31', 'man1', -0.004251),
('2014-12-31', 'man2', 0.008737),
('2014-12-31', 'man3', -0.013576),
('2014-12-31', 'man4', 0.001000),
('2014-12-31', 'man5', 0.001000),
('2014-12-31', 'man6', -0.003400),
('2014-12-31', 'bmark', 0.001013),
('2015-01-31', 'man1', -0.004039),
('2015-01-31', 'man2', 0.012938),
('2015-01-31', 'man3', -0.011891),
('2015-01-31', 'man4', 0.004576),
('2015-01-31', 'man5', 0.001000),
('2015-01-31', 'man6', -0.004195),
('2015-01-31', 'bmark', -0.002653),
('2015-02-28', 'man1', 0.026326),
('2015-02-28', 'man2', 0.019695),
('2015-02-28', 'man3', -0.013178),
('2015-02-28', 'man4', 0.010737),
('2015-02-28', 'man5', 0.001000),
('2015-02-28', 'man6', 0.006418),
('2015-02-28', 'bmark', -0.009520),
('2015-03-31', 'man1', -0.000628),
('2015-03-31', 'man2', 0.008029),
('2015-03-31', 'man3', 0.005917),
('2015-03-31', 'man4', 0.017461),
('2015-03-31', 'man5', 0.000480),
('2015-03-31', 'man6', -0.005010),
('2015-03-31', 'bmark', 0.007879),
('2015-04-30', 'man1', 0.005688),
('2015-04-30', 'man2', 0.012490),
('2015-04-30', 'man3', -0.018813),
('2015-04-30', 'man4', 0.001000),
('2015-04-30', 'man5', -0.002104),
('2015-04-30', 'man6', 0.003657),
('2015-04-30', 'bmark', 0.009886),
('2015-05-31', 'man1', 0.010039),
('2015-05-31', 'man2', 0.008442),
('2015-05-31', 'man3', -0.014650),
('2015-05-31', 'man4', 0.001000),
('2015-05-31', 'man5', 0.001000),
('2015-05-31', 'man6', 0.001024),
('2015-05-31', 'bmark', 0.001695),
('2015-06-30', 'man1', -0.004267),
('2015-06-30', 'man2', 0.001391),
('2015-06-30', 'man3', -0.022504),
('2015-06-30', 'man4', 0.003104),
('2015-06-30', 'man5', 0.001000),
('2015-06-30', 'man6', -0.003507),
('2015-06-30', 'bmark', 0.009854),
('2015-07-31', 'man1', -0.001672),
('2015-07-31', 'man2', 0.020558),
('2015-07-31', 'man3', -0.011859),
('2015-07-31', 'man4', 0.001000),
('2015-07-31', 'man5', 0.001000),
('2015-07-31', 'bmark', 0.008361),
('2015-08-31', 'man1', 0.015726),
('2015-08-31', 'man2', 0.017419),
('2015-08-31', 'man3', -0.004556),
('2015-08-31', 'man4', 0.001000),
('2015-08-31', 'man5', -0.000462),
('2015-08-31', 'bmark', -0.007253),
('2015-09-30', 'man1', 0.001977),
('2015-09-30', 'man2', 0.007301),
('2015-09-30', 'man3', -0.008110),
('2015-09-30', 'man4', 0.013011),
('2015-09-30', 'man5', -0.001032),
('2015-09-30', 'bmark', 0.009911),
('2015-10-31', 'man1', 0.016201),
('2015-10-31', 'man2', 0.008770),
('2015-10-31', 'man3', -0.005536),
('2015-10-31', 'man4', 0.014527),
('2015-10-31', 'man5', -0.000833),
('2015-10-31', 'bmark', 0.009897),
('2015-11-30', 'man1', 0.019996),
('2015-11-30', 'man2', -0.000785),
('2015-11-30', 'man3', -0.002161),
('2015-11-30', 'man4', 0.001947),
('2015-11-30', 'man5', 0.001000),
('2015-11-30', 'bmark', -0.007307),
('2015-12-31', 'man1', -0.003254),
('2015-12-31', 'man2', 0.009595),
('2015-12-31', 'man3', -0.013785),
('2015-12-31', 'man4', 0.001000),
('2015-12-31', 'man5', 0.001000),
('2015-12-31', 'bmark', 0.007196)
) n (dt, man, R);
SELECT m.man as manager,
wct.FinCoSkew(m.r, b.r) as CoSkew
FROM #nmanagers m
INNER JOIN #nmanagers b
ON m.dt = b.dt
WHERE m.man <> 'bmark'
AND b.man = 'bmark'
GROUP BY m.man;
This produces the following result.
{"columns":[{"field":"manager"},{"field":"CoSkew","headerClass":"ag-right-aligned-header","cellClass":"ag-right-aligned-cell"}],"rows":[{"manager":"man1","CoSkew":"6.11485619814116E-08"},{"manager":"man2","CoSkew":"1.85340757111935E-08"},{"manager":"man3","CoSkew":"-2.76612489908329E-09"},{"manager":"man4","CoSkew":"2.37724649476171E-08"},{"manager":"man5","CoSkew":"-8.70823033006535E-09"},{"manager":"man6","CoSkew":"3.1025905253203E-08"}]}
See Also
BETACOKURT - Calculate the beta-cokurtosis of an asset return and a benchmark return
BETACOSKEW - calculate the beta-coskewness of an asset return and a benchmark return
BETACOVAR - Calculate the beta-covariance of an asset return and a benchmark return
FINCOKURT - Calculate the cokurtosis of an asset return and a benchmark return