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Preliminary analyses revealed that absolute values of item difficulty better predicted correct DIF detection, whereas signed item difficulty values more accurately predicted incorrect DIF decisions.
If you are lucky enough to have a celebrity supporter who may be willing to donate a signed item of value or a collection of items, here are a few useful tips to get you motivated and prepared to use this great opportunity to its fullest potential.
If you want a second opinion about the value of any signed item, check out collector Russell Still's Web site, Valusign.com.
Most collectors prefer authenticated material, and some won't even bother with any signed item that hasn't been authenticated.
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As the Yankees left today, they signed items for Michael.
Back translation of all signed items showed good convergence with the original items.
All written or signed items were presented one by one on a laptop.
Inevitably, they are asked to sign items bearing their names or likeness.
The odds of his actually stopping to sign items, according to an informal poll, are 10 percent.
Some had driven hours to see him and he was not met with just the usual requests for selfies – he was also asked to sign items ranging from a pocket constitution to an American flag.
It was to combat forgeries, take advantage of its distribution abilities and "organize this collectible part of myself, which is big business" that Franco Harris, formerly of the Pittsburgh Steelers, decided to sign items through Steiner Sports.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com