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ASSIGNMENT 2

set.seed allows the user to set the initial seed for variate generators. Use your student id as a seed number. You should write set.seed(your student id) at the beginning of your code. For example if your student id is 2020555001 then write set.seed(2020555001). This will provide that everyone has different generated numbers from each other.

Save your codes for part 1 and part 2 in two different R files.

Part 1

Save the attached file (covid-data-2020) as an Excel file (.csv, .xls or .xlsx format), then import this data to R. (You can supply an inline CSV file instead of importing, if you like).

Take a random sample of 1000 observations from this data (you can use sample() function), and save this sample as a new data. Answer the following questions using this sample.

Calculate the five-number summary statistics (minimum-Q1-median-Q3-maximum) of covid-19 daily new cases for each country within each month. (you can use quantile() function to get the quartiles) Find the highest daily cases and deaths separately for each country. Identify the month in which the mean daily cases is the highest for each country. Select 3 country and plot the distribution of daily cases by month. Use location as clusters (i.e., color=location) to show the difference between countries.

Part 2

Answer the following questions by using the sentences, which are provided in stringr::sentences.

Take a random sample of 100 sentences from this data, then split these sentences into words and take each word as a member of a vector. After removing duplicated words (you can use unique() function to remove duplicated words), save this sample as a new data. With this new data, provide the answers for Find words which are starting with “a” and ending with “e”. Calculate the number of words which have more than 3 vowels. List the five longest word in your data Try to find word(s) which contain any of these words: age, any, day, exp, her, pro, the.