Adding cognostics
Let's practice custom cognostics by taking the by_symbol data merged with the stock metadata creating a cognostic for the log market capitalization.
This exercise is part of the course
Visualizing Big Data with Trelliscope in R
Exercise instructions
- Use
mutate()to create a new variable,market_cap_log, which is the base 10 logarithm ofmarket_cap. - Use the
cog()wrapper function to provide a custom description for the cognostic,"log base 10 market capitalization".
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
library(trelliscopejs)
library(dplyr)
# Create market_cap_log
by_symbol <- mutate(by_symbol,
___ = cog(
val = ___(___),
___ = "log base 10 market capitalization"
)
)