Course Content

R Introduction: Part I

## R Introduction: Part I

# Counting 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:

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

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.

Task

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

factor.

Everything was clear?

# Counting 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:

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

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.

Task

`grades_f`

factor.

Everything was clear?

# Counting 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:

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

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

`grades_f`

factor.

Task

`grades_f`

factor.

Everything was clear?

**count the occurrences of each value** within a vector, the `summary()`

function is exactly what you need.

`summary()`

function with the **factor** as its argument. This will list the occurrences for each level that the factor can take. For instance:

`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

`grades_f`

factor.