Shiny app provides time series analysis of Pfizer, Johnson&Johnson, and Novartis stock data from 5/1/2012-5/1/2017. App allows comparison of Open, High, Low, Close, and Adj.Close prices along with time series modeling using Holt-Winters or ARIMA. Additionally, evaluation of predictions (for 2017) with MSE metric using only 2012-2016 data for model building is available.