“Models enable us to actually estimate the number of people who have not been listed at all,” Dr. Checchi said. That, combined with the listed number, gave the analysts their total.
Patrick Ball, director of research at the Human Rights Data Analysis Group, and a statistician who has conducted similar estimates of violent deaths in conflicts in other regions, said the study was strong and well reasoned. But he cautioned that the authors may have underestimated the amount of uncertainty caused by the ongoing conflict.
The authors used different variations of mathematical models in their calculations, but Dr. Ball said that rather than presenting a single figure — 64,260 deaths — as the estimate, it may have been more appropriate to present the number of deaths as a range from 47,457 to 88,332 deaths, a span that encompasses all of the estimates produced by modeling the overlap among the three lists.
“It’s really hard to do this kind of thing in the middle of a conflict,” Dr. Ball said. “It takes time, and it takes access. I think you could say the range is larger, and that would be plausible.”
While Gaza had a strong death registration process before the war, it now has only limited function after the destruction of much of the health system. Deaths are uncounted when whole families are killed simultaneously, leaving no one to report, or when an unknown number of people die in the collapse of a large building; Gazans are increasingly buried near their homes without passing through a morgue, Dr. Checchi said.
The authors of the study acknowledged that some of those assumed dead may in fact be missing, most likely taken as prisoners in Israel.
Roni Caryn Rabin and Lauren Leatherby contributed reporting.
