The Knox method and other tests for space-time interaction
Related Experiment Video
Updated: Aug 17, 2026

MPI CyberMotion Simulator: Implementation of a Novel Motion Simulator to Investigate Multisensory Path Integration in Three Dimensions
Published on: May 10, 2012
1Biometry Branch, DCP, National Cancer Institute, Bethesda, Maryland 20892-7354, USA. martinlink@neuron.uchc.edu
Abstract:
The Knox method, as well as other tests for space-time interaction, are biased when there are geographical population shifts, i.e., when there are different percent population growths in different regions. In this paper, the size of the population shift bias is investigated for the Knox test, and it is shown that it can be a considerable problem. A Monte Carlo method for constructing unbiased space-time interaction tests is then presented and illustrated on the Knox test as well as for a combined Knox test. Practical implications are discussed in terms of the interpretation of past results and the design of future studies.
Related Concept Videos
Interference and Diffraction
Space-Time Curvature and the General Theory of Relativity
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of motion,...
Kendall's Tau Test
A τ value of +1 indicates that...
Reduced Mass Coordinates: Isolated Two-body Problem
Classical Mechanics
Real-World Applications of Space Curves

