送交者: LaoXiao 于 2009-05-30, 18:07:06:

回答: the errors have expectation zero and are uncorrelated and have equal variances 由 wasqaz 于 2009-05-30, 17:01:37:

• 是么？<Xi>=0, <Xi Xj>=0 - wasqaz (90 bytes) 2009-05-30, 18:25:56 (331353)
  • Let {Xi} be any i.i.d. r.v. with finite 2nd moment, then ...... - LaoXiao (92 bytes) 2009-05-30, 20:50:43 (331369)
  • 有何不可？ - wasguru (100 bytes) 2009-05-30, 18:34:34 (331354)
    • 方差相等也是两个随机变量之间的关系 - wasguru (114 bytes) 2009-05-30, 18:53:11 (331359)
    • and have equal variances - wasqaz (25 bytes) 2009-05-30, 18:49:01 (331356)

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