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.
As a general rule, Socialbakers found that posting once per week on Facebook was so low as to lose connection with your audience and posting more than twice per day was crossing the line into annoying. Its 2011 study found that the sweet spot is five to 10 posts per week. Additional research by Track Social in 2012 confirmed that there is indeed a drop in response per post beyond the one-post-per-day mark. When a brand posts twice a day, those posts only receive 57% of the likes and 78% of the comments per post. The drop-off continues as more posts are made in the day. However, Track Social went a step further to see the effect that multiple posts per day had on a pageâs total responses in a given.