It isn't that simple. We want to know what percentage of tweets have property X given event Y. We can estimate that using a sample and error bars. Note that th

It isn't that simple. We want to know what percentage of tweets have property X given event Y. We can estimate that using a sample and error bars. Note that the quotes specifically avoid this inference because the error bars would be silly. 500 million total tweets a day can't be talked about based on 7,000 hand categorized tweets. But non staticians don't have any reference point for how powerful a predictor it is so a short hand is < 10% probably means in the error bars so less believable.