intheangel 发表于 2014-3-22 14:03
你是要算期货的定价,还是想在SAS中设定日期?期货的定价我也忘了,但是书上或者网上肯定有,你把公式找到, ...
期货的定价公式是Ft=St*exp((T-t)*(r-δ)....然后我现在有一系列的数据
比如
2010-4-16
2010-4-19
2010-4-20
2010-4-21
2010-4-22
2010-4-23
2010-4-26
2010-4-27
2010-4-28
2010-4-29
2010-4-30
2010-5-4
2010-5-5
2010-5-6
2010-5-7
2010-5-10
2010-5-11
2010-5-12
2010-5-13
2010-5-14
2010-5-17
2010-5-18
2010-5-19
2010-5-20
2010-5-21
2010-5-24
2010-5-25
2010-5-26
2010-5-27
2010-5-28
2010-5-31
2010-6-1
2010-6-2
2010-6-3
2010-6-4
2010-6-7
2010-6-8
2010-6-9
2010-6-10
2010-6-11
2010-6-17
2010-6-18
2010-6-21
2010-6-22
2010-6-23
2010-6-24
2010-6-25
2010-6-28
2010-6-29
2010-6-30
2010-7-1
2010-7-2
2010-7-5
2010-7-6
2010-7-7
2010-7-8
2010-7-9
2010-7-12
2010-7-13
2010-7-14
2010-7-15
2010-7-16
2010-7-19
2010-7-20
2010-7-21
2010-7-22
2010-7-23
2010-7-26
2010-7-27
2010-7-28
2010-7-29
2010-7-30
2010-8-2
2010-8-3
2010-8-4
2010-8-5
2010-8-6
2010-8-9
2010-8-10
2010-8-11
2010-8-12
2010-8-13
2010-8-16
2010-8-17
2010-8-18
2010-8-19
2010-8-20
2010-8-23
2010-8-24
2010-8-25
2010-8-26
2010-8-27
2010-8-30
2010-8-31
2010-9-1
2010-9-2
2010-9-3
2010-9-6
2010-9-7
2010-9-8
2010-9-9
2010-9-10
2010-9-13
2010-9-14
2010-9-15
2010-9-16
2010-9-17
2010-9-20
2010-9-21
2010-9-27
2010-9-28
2010-9-29
2010-9-30
2010-10-8
2010-10-11
2010-10-12
2010-10-13
2010-10-14
2010-10-15
2010-10-18
2010-10-19
2010-10-20
2010-10-21
2010-10-22
2010-10-25
2010-10-26
2010-10-27
2010-10-28
2010-10-29
2010-11-1
2010-11-2
2010-11-3
2010-11-4
2010-11-5
2010-11-8
2010-11-9
2010-11-10
2010-11-11
2010-11-12
2010-11-15
2010-11-16
2010-11-17
2010-11-18
2010-11-19
2010-11-22
2010-11-23
2010-11-24
2010-11-25
2010-11-26
2010-11-29
2010-11-30
2010-12-1
2010-12-2
2010-12-3
2010-12-6
2010-12-7
2010-12-8
2010-12-9
2010-12-10
2010-12-13
2010-12-14
2010-12-15
2010-12-16
2010-12-17
2010-12-20
2010-12-21
2010-12-22
2010-12-23
2010-12-24
2010-12-27
2010-12-28
2010-12-29
2010-12-30
2010-12-31
然后他们的合约到期日都是下个月的第三个周五,比如2010-4-16就是2010-5-21....
我想问的是它们的这个时间差SAS中要怎么实现?