Invalid inversion

Invalid Recipes

Invalid measurement validity.

Concurrence looks at how a measure relates to a gold standard. If, as frequently occurs, there isn’t one, the next best is the correlation with other established measures. This assumes that the latter are themselves valid, which may not be true, and risks stifling innovation, a source of concern if a paper is criticized on this ground. More straightforwardly, concurrence also means that a test ...

Representing "Just Invalid" Knowledge

Data, information and knowledge are all represented in a single formalism as “items”. Items contain two types of acceptability measures that measure the invalidity of item instances. Objects are item building operators that also contain two types of acceptability measures. These acceptability measures define a graduated acceptability region for data, information and knowledge. This region repre...

Invalid Permutation Tests

Permutation tests are often presented in a rather casual manner, in both introductory and advanced statistics textbooks. The appeal of the cleverness of the procedure seems to replace the need for a rigorous argument that it produces valid hypothesis tests. The consequence of this educational failing has been a widespread belief in a “permutation principle”, which is supposed invariably to give...

Protecting BGP from Invalid Paths

The Internet’s interdomain routing protocol, BGP, is vulnerable to a number of potentially crippling attacks. Many promising cryptography-based solutions have been proposed, but none have been embraced by the necessary communities to garner significant adoption. This is largely due to the difficulty of developing and maintaining the necessary PKI infrastructure and changes to the BGP protocol t...