Here's a comparison of speeds derived from the fixed density method and the Delta-X Criterion.
Relationship Between Fixed Density Speeds and Delta X Speeds.jpg
Except this is not as much a comparison between two methods as it is between an accurate method, Delta-X, and the erroneous and inaccurate use of another.
This is why the Delta-X speeds change little with changes in development.
Comparisons of Delta X at different Delta Ds.jpg
As the gradient changes with development and the fixed density point shifts left and right, the fractional gradient point's relationship to the fixed density point changes but it's log-H remains relatively constant.
Last edited by Stephen Benskin; 02-28-2013 at 11:52 PM. Click to view previous post history.