Table 3: Comparisons of accumulated weight statistics for parallax measurements of single stars with five-parameter solutions in the old and the new Hipparcos reductions. The errors are given in mas.
Observations Mean error Weight

Interval New Old New Old ratio

All 101783 100037 0.66 0.96 2.16

${\rm Hp}\ge 9$ 34799 33347 1.23 1.33 1.23

${\rm Hp}<9$ 66984 66690 0.56 0.86 2.36

${\rm Hp}<7$ 10883 11127 0.33 0.70 4.29

**Table 3:** Comparisons of accumulated weight statistics for parallax measurements of single stars with five-parameter solutions in the old and the new Hipparcos reductions. The errors are given in mas.
	Observations	Mean error	Weight
Interval	New	Old	New	Old	ratio
All	101783	100037	0.66	0.96	2.16
${\rm Hp}\ge 9$	34799	33347	1.23	1.33	1.23
${\rm Hp}<9$	66984	66690	0.56	0.86	2.36
${\rm Hp}<7$	10883	11127	0.33	0.70	4.29

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