R DATE TIME and FACTORS
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R programming. Dates Time and Factors. Categorical data. Examples.
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R DATE TIME and FACTORS
- 2. DATES IN R • Date objects • Using as.Date – converts a string into integer • Number of days from 01/01/1970 • Using your own epoch in as.Date • Sequence function • Date + Time objects • as.POSIXct – suitable for data frames • as.POSIXlt – human readable • Uses machines time zone • Time zone may be specified
- 3. DATES IN R • Operations of date objects • Weekdays, months, quarters • diff • difftime
- 4. LUBRIDATE • Special functions • ymd, mdy, dmy • hms, hm • ymd_hm • seconds, months, years • Arithmetic operations • Explicitly specify units
- 5. CATEGORICAL DATA (FACTORS) • Factors – data type for handling categorical data • Labels • Levels • Creation • Using factor function • Label and level are determined alphabetically • Levels can be user-specified • Changing the levels • Reordering the levels • Reducing the levels
- 6. CATEGORICAL DATA (FACTORS) • Creating factors from continuous data
Editor's Notes
- For effectively using R for gaining insights from data one needs to have working knowledge of the standard data types and data structures in R.
- For effectively using R for gaining insights from data one needs to have working knowledge of the standard data types and data structures in R.
- For effectively using R for gaining insights from data one needs to have working knowledge of the standard data types and data structures in R.
- For effectively using R for gaining insights from data one needs to have working knowledge of the standard data types and data structures in R.
- For effectively using R for gaining insights from data one needs to have working knowledge of the standard data types and data structures in R.