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R Introduction: Part I
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Course Content

R Introduction: Part I

R Introduction: Part I

1. Basic Syntax and Operations
Why R?Basic ArithmeticUsing the print() Function Comments in RInteger Division and RemaindersExponentiationcat() FunctionVariablesRevenue CalculationAssignment Operators
2. Basic Data Types and Vectors
Data TypesNumbersType ConversionLogical TypesVectorsLabeling VectorsIndexing in VectorsModifying VectorsDeleting Elements from VectorsArithmetic Operations with Vectors
3. Factors
What is a Factor?Indexing in FactorsLevelsCounting ValuesGrouping Numeric DataGrades Summary

bookCounting Values

If you're looking to count the occurrences of each value within a vector, the summary() function is exactly what you need.

To tally the frequency of each level within a factor, use the summary() function with the factor as its argument. This will list the occurrences for each level that the factor can take. For instance:


              
12345

            
# Factor variable
curr_f <- factor(c('USD', 'EUR', 'AUD', 'NOK', 
                  'CHF', 'EUR', 'AUD', 'EUR'))
# Show summary
summary(curr_f)
copy

Remember, the sequence of the levels reported by summary() corresponds to the order defined when you used the factor() function. If no order is defined, it defaults to numerical or alphabetical order.

Task

For the grades data mentioned earlier, compute the frequency of each grade within the grades_f factor.

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Section 3. Chapter 4
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bookCounting Values

If you're looking to count the occurrences of each value within a vector, the summary() function is exactly what you need.

To tally the frequency of each level within a factor, use the summary() function with the factor as its argument. This will list the occurrences for each level that the factor can take. For instance:


              
12345

            
# Factor variable
curr_f <- factor(c('USD', 'EUR', 'AUD', 'NOK', 
                  'CHF', 'EUR', 'AUD', 'EUR'))
# Show summary
summary(curr_f)
copy

Remember, the sequence of the levels reported by summary() corresponds to the order defined when you used the factor() function. If no order is defined, it defaults to numerical or alphabetical order.

Task

For the grades data mentioned earlier, compute the frequency of each grade within the grades_f factor.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 3. Chapter 4
toggle bottom row

bookCounting Values

If you're looking to count the occurrences of each value within a vector, the summary() function is exactly what you need.

To tally the frequency of each level within a factor, use the summary() function with the factor as its argument. This will list the occurrences for each level that the factor can take. For instance:


              
12345

            
# Factor variable
curr_f <- factor(c('USD', 'EUR', 'AUD', 'NOK', 
                  'CHF', 'EUR', 'AUD', 'EUR'))
# Show summary
summary(curr_f)
copy

Remember, the sequence of the levels reported by summary() corresponds to the order defined when you used the factor() function. If no order is defined, it defaults to numerical or alphabetical order.

Task

For the grades data mentioned earlier, compute the frequency of each grade within the grades_f factor.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

If you're looking to count the occurrences of each value within a vector, the summary() function is exactly what you need.

To tally the frequency of each level within a factor, use the summary() function with the factor as its argument. This will list the occurrences for each level that the factor can take. For instance:


              
12345

            
# Factor variable
curr_f <- factor(c('USD', 'EUR', 'AUD', 'NOK', 
                  'CHF', 'EUR', 'AUD', 'EUR'))
# Show summary
summary(curr_f)
copy

Remember, the sequence of the levels reported by summary() corresponds to the order defined when you used the factor() function. If no order is defined, it defaults to numerical or alphabetical order.

Task

For the grades data mentioned earlier, compute the frequency of each grade within the grades_f factor.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 3. Chapter 4
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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