Calculation of tension exerted on a ligature in incomplete hanging
(
Author: Vladislav D. Khokhlov)
(I found the complete PDF, which includes drawings of each posture and calculations. The file is attached below)
I think it is a good information source for those who have opted for Partial Hanging, and to know which position would be the most appropriate.
Since choosing a position where more weight is applied will make it easier to block the carotid arteries. (Clarifying that the correct positioning of the ligature and knot is also essential)
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Brief summary...

Body positions are presented:
• in
standing posture the ligature is stretched by more than 65% of the body weight
• in
kneeling position by 64–74%
• in
sitting by 17–32%
• in
recumbent posture by less than 18% of the body weight

Strength of the neck compression in hanging depends on many factors, including body position in the loop.
In
complete (full) hanging the loop is tightened by the whole body weight.
In
incomplete (partial) hanging some of the body weight (15–81%) rests on the floor, thus decreasing the strain of the ligature.
Position of the body parts in incomplete hanging is determined by numerous circumstances, e.g. length of the rope end and the height of its attachment, characteristics of the surroundings and other details (position of the body before hanging, binding of the extremities, pathology of the weight-bearing and locomotor apparatus, etc).

The results of the calculation show similarity in minimum part of the weight, affecting the ligature in standing and kneeling positions. In both postures the head, trunk and upper extremities, making up nearly 60% of the total body weight, hang completely. So tension of the ligature in these positions of hanging will be always significantly higher than in sitting and lying positions, when the trunk is set against the support.
At the same time, variants of hanging in standing position have weight range more than three times as wide as in kneeling position. This explains higher percent of injuries to the hyoid bone and laryngeal cartilages in standing position of hanging compared to the kneeling one.
Strain on a ligature in sitting and lying positions is noticeably lower and these two weight ranges practically do not intersect.
Research: Source