Something’s wrong with alexa! they don’t have data about Bing

I was just having a go through Alexa, about Bing's traffic ranking and I found that something's wrong with Alexa. They have no data about Bing, even though it shows the other results such as pageviews, pageviews/user, Bounce, reach and other things, but it's showing that it has no data about the traffic rank and Avg. time on site. The [...]