Introduction

In an effort to reduce emissions, road wear, collisions, and road and transit congestion and to improve public health, the New York City Department of Transportation (NYCDOT) researched alternative forms of transportation, publishing a strategic plan in 2008. According to NYCDOT statistics, 56% of all automobile trips within the city are under 3 miles (4.8 km) (with 22% under 1 mile (1.6 km) and 10% under 0.5 miles (0.80 km)), well within distances readily served by bicycle. To encourage residents to use bicycles more, the city committed to expanding bike lane miles, bike racks, and bike-parking shelters, thus setting the stage for the formation of Citibike. (https://en.wikipedia.org/wiki/Citi_Bike)
We wanted to check whether ridership drops after January due to people possibly not following their resolutions. If that is really the case, Citibike can provide discounts or other incentives to increase ridership and help people stick to their resolutions. 

Data

The monthly Citibike data for the months January and February for the year 2015 and 2016 was taken from this link: