By Bill Rigby SEATTLE (Reuters) – Microsoft Corps new chief executive, Satya Nadella, likes to boast that Bing is growing and powers 30 percent of the Internet search market, making it a worthy competitor to Google Inc . But within the advertising and research industries that measure and manage search as a business, Microsofts strength is an open question. The figures quoted by Microsoft, which include searches by partner Yahoo Inc , are much higher than the rate at which people actually click on the links that a search returns, according to new studies by industry researchers. The new search data calls into question Bings effectiveness for advertisers.