Selection bias occurs when the association between exposure and health outcome is different for those who complete a study compared with those who are in the target population. Sources of selection bias. Selective survival and losses to follow-up After enrollment of subjects and collection of baseline data there is
NUMBER OF PUBLIC PHOTOS UPLOADED IN 2013. - 680 million, - 56.7 million per month in average, - 1.86 million per day in average. NUMBER OF PUBLIC PHOTOS UPLOADED IN 2012. - 556 million, - 46.3 million per month in average, - 1.52 million per day in average. NUMBER OF PUBLIC PHOTOS UPLOADED IN 2011. - 575 million, - 47.9 million per month in average, - 1.57 million per day in average.
tumblr. Previously, the only way to upload multiple photos to Facebook while mobile was using a third-party app, or the official Facebook Camera app on iOS. Neither solution was all that convenient. With the latest update, version 5.0, Facebook users can now upload multiple photos at the same time.When uploading a photo, users simply need to select the first photo, then tap on the camera icon or the photo's thumbnail to select another photo.This is a welcome addition to the Facebook app.either solution was all that convenient. With the latest update, version 5.0, Facebook users can now upload multiple photos at the same time. When uploading a photo, users simply need to select the first photo, then tap on the camera icon or the photo's thumbnail to select another photo.