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MGG Exam 9/Questions with verified answers
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MGG Exam 9/Questions with verifiedanswers
Commands in Tidyr - - gather
separate
spread
unite
- Standards for tidy data - - Each variable forms a column
Each observation forms a row
Each type of observational unit forms a table
- Categories of Messy data - - Column Headers are values, not value names
Multiple variables are stored in one column
Variables are stored in both rows and columns
Multiple types of observational units are stored in the same table
Single observational unit is stored in multiple tables
- Column headers are values, not variable names - - Can fix by making
"density" a column and having all the densities fall under that
- then do separate column for frequencies
- gathering all the nonvariable columns
- Multiple variables are stored in one column - - Hybrid columns are made
with two variables
- make Diet and In/ob their own columns
- separating the mixed variables into their own columns
- Variables in rows and columns - - Rows are only supposed to have
observations or samples
Variables are for columns
- Spread the immune data into a column so its not in the rows
- so column headings would be Sample, IgA, IgG
- Multiple types of observational units are stored in the same table - - Only
one type of data should be in one table, otherwise it gets referenced by the
computer twice and isn't good
- ex: billboard has one table that references each song and its rank each
week for a year
- good ex: representative sequences table and feature table
- Single observational unit is stored in multiple tables - - Ex: popular baby
names over the past 5 years, with each year as its separate table.
- would be easier to combine these into one table
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