We are three graduate students at UC Berkeley, and we are currently working on a machine learning project for a class that we’re taking. 

We’re using the page views data that we believe you maintain: https://dumps.wikimedia.org/other/pagecounts-raw/

We have two quick questions that we were hoping you could answer:

1) We found views with a size of -1 or 0. Does this mean the page doesn’t exist?

2) We found some articles have `size` that widely varies throughout the hourly snapshots of a day. Is that legitimate, or is there something odd with the data?