用Pettitt法检验气温系列，Sk的绝对值随着项数增多而增大，不知是错在那？请高手指教

gradfine

年	年平均气温	大于	小于	等于	项数	ri	file:///C:/DOCUME~1/llqxj/LOCALS~1/Temp/ksohtml/clip_image1.png file:///C:/DOCUME~1/llqxj/LOCALS~1/Temp/ksohtml/clip_image2.png	Sk
1961	14.8	0	0	0	0	0	0	0
1962	14.5	1	0	0	1	-1	-1	-4
1963	15.1	0	2	0	2	2	1	-4
1964	15	1	2	0	3	1	2	-8
1965	14.8	2	1	1	4	-1	1	-18
1966	15.1	0	4	1	5	4	5	-20
1967	14.3	6	0	0	6	-6	-1	-44
1968	14.1	7	0	0	7	-7	-8	-72
1969	15.2	0	8	0	8	8	0	-72
1970	14.8	4	3	2	9	-1	-1	-92
1971	14	10	0	0	10	-10	-11	-132
1972	14.7	7	4	0	11	-3	-14	-160
1973	15.2	0	11	1	12	11	-3	-162
1974	14.1	11	1	1	13	-10	-13	-208
1975	14.8	5	6	3	14	1	-12	-234
1976	14.2	12	3	0	15	-9	-21	-282
1977	14.2	12	3	1	16	-9	-30	-332
1978	14.3	11	5	1	17	-6	-36	-378
1979	14.8	5	9	4	18	4	-32	-406
1980	15.1	2	15	2	19	13	-19	-418
1981	15	5	14	1	20	9	-10	-440
1982	14.7	12	8	1	21	-4	-14	-490
1983	14.4	15	7	0	22	-8	-22	-550
1984	14.9	7	16	0	23	9	-13	-578
1985	14.5	15	8	1	24	-7	-20	-640
1986	14.7	13	10	2	25	-3	-23	-696
1987	15.1	2	21	3	26	19	-4	-710
1988	15.1	2	21	4	27	19	15	-726
1989	14.6	18	10	0	28	-8	7	-798
1990	14.7	15	11	3	29	-4	3	-864
1991	15.1	2	23	5	30	21	24	-882
1992	14	30	0	1	31	-30	-6	-1004
1993	14.6	20	11	1	32	-9	-15	-1086
1994	15.1	2	25	6	33	23	8	-1106
1995	14.9	11	22	1	34	11	19	-1152
1996	14.8	13	17	5	35	4	23	-1214
1997	14.7	19	13	4	36	-6	17	-1298
1998	15.9	0	37	0	37	37	54	-1298
1999	15.5	1	37	0	38	36	90	-1302
2000	15	11	26	2	39	15	105	-1350
2001	15.3	2	38	0	40	36	141	-1358
2002	15.4	2	39	0	41	37	178	-1366
2003	15.7	1	41	0	42	40	218	-1370
2004	14.8	19	18	6	43	-1	217	-1458
2005	15.6	2	42	0	44	40	257	-1466
2006	15.7	1	43	1	45	42	299	-1472
2007	15.1	9	30	7	46	21	320	-1522
2008	15	17	27	3	47	10	330	-1596
2009	15.7	1	45	2	48	44	374	-1604
2010	16.2	0	49	0	49	49	423	-1604
2011	15.1	11	31	8	50	20	443	-1664
2012	16.3	0	51	0	51	51	494	-1664
2013	15.2	10	40	2	52	30	524	-1708
	14.9

z1985az001

研究下先！！！