1. 2007-04-14 [R-sig-ME] [R] negative variances r-sig-mix Douglas Bates 2. 2007-04-12 [R-sig-ME] [R] negative variances r-sig-mix Tu Yu-Kang 3. 2007-04-12 [R-sig-ME] [R] negative variances r-sig-mix Douglas Bates 4. 2007-04-12 [R-sig-ME] [R] negative variances r-sig-mix John Maindonald 5. 2007-04-12 [R-sig-ME] [R] negative variances r-sig-mix Tu Yu-Kang 6. 2007-04-11 [R-sig-ME] [R] negative variances r-sig-mix Douglas Bates