DataScience

• Factor variable trap
• how to use gsub() &sub() for cleasning data
• Mehtods for dealing with missing data
• NA- the 3rd logical constant
• Howto locate missing data: complete.cases()
• Filtering techniques: which() & is.na()
• Median Imputation Method
• Factual Analysis & Deriving Values Methods

R-list

• hot to handle Date-Times in R
• What POSIXct time is
• what is list is
• working with list
• differences between [] and [[]] and$
• subsetting a list
• how to create a timeseries plot in r

Apply family

• How the Apply family of functions works
• How to recreate apply statement with a for() loop
• When to use apply(), lapply or sapply()
• How to combine lapply() with []
• How to nest your own function in Apply-type function
• How to nes Apply-type function within each other
• How to use the which.max() and which.min() function