7. One or more tangible computer-readable media storing computer-useable instructions that, when used by a computing device, cause the computing device to perform a method for performing interleaving experiments on blended search results, the method comprising: identifying a first version of a blending algorithm that blends search results produced by a first ranking system and search results produced by a second ranking system to produce a first set of blended search results based on a search query; varying a first parameter of the first ranking system to create a second version of the blending algorithm that produces a second set of blended search results based on the search query; interleaving the produced first set of the blended search results and the produced second set of the blended search results to generate an interleaved set of search results; performing an interleaving experiment for the search query using the generated interleaved set of search results; and based on the performed interleaving experiment, determining which of the identified first version of the blending algorithm or the created second version of the blending algorithm is preferred by users who receive the generated interleaved set of search results.
7. One or more tangible computer-readable media storing computer-useable instructions that, when used by a computing device, cause the computing device to perform a method for performing interleaving experiments on blended search results, the method comprising: identifying a first version of a blending algorithm that blends search results produced by a first ranking system and search results produced by a second ranking system to produce a first set of blended search results based on a search query; varying a first parameter of the first ranking system to create a second version of the blending algorithm that produces a second set of blended search results based on the search query; interleaving the produced first set of the blended search results and the produced second set of the blended search results to generate an interleaved set of search results; performing an interleaving experiment for the search query using the generated interleaved set of search results; and based on the performed interleaving experiment, determining which of the identified first version of the blending algorithm or the created second version of the blending algorithm is preferred by users who receive the generated interleaved set of search results. 8. The one or more tangible computer-readable media of claim 7 , wherein the created second version of the blending algorithm uses the search results produced by the first ranking system and the search results produced by the second ranking system.