Hw03 is ready for grading

[sepkamal]

Hi @shadowforti

Nice homework assignment!

Here are some general thoughts:

• try giving your data frame a more informative name than simply 'x'
• nice use of kable
• I liked how you coloured some of your graphs by continent. It would makes things more consistent & useful if you did this with the other to grey graphs.
• I'd recommend spreading your code out over more lines to make it a bit more readable
• had some minor typos, could try using the spell check in Rstudio
• nice use of pipe
• as you suggested, additions such as graph titles would be useful
• repo is well organized

Task 1:

• nice graphs and table
• can you think of a way to show both the min and max on the same graph?

Task 2:

• great use of facet_wrap
• graph might be more informative with a log scale
• did you consider adding a table for this too? Could look at things like standard deviation, median, etc.

Task 3:

• really liked how calculated the trimmed mean. Didn't know how to do that

Task 4:

• Nice and clean analysis

Good work! Sep

[yidie]

Hi Jian, here are some comments:

• Task1 Tables and graphs are good. Maybe try if you can plot both the max and min in the same graph?

• Task2 In terms of looking at spread in a table, you might want to calculate the variance/standard deviation of gdpPercap for each continent and show them in a table. The graph could be a boxplot which is more informative than histogram when you want to see the spread of certain variables.

• Task3 Good job calculating the trimmed mean using trim argument in the mean function and add this mean to the dataframe. You might also want to create a table listing the years and the corresponding lifeExp. In the graph, maybe try geom_point instead of geom_bar since lifeExp is a quantitative variable. But what you did is good as well.

• Task 4 Table is well done! Graph is informative. Good observations from the graph.

Your homework is very organized. I appreciate that you illustrate every step you do. It is very easy for readers to follow what you are doing. For all the tasks, you start by extracting information from the data and then manipulate and then plot. Good job! I'd suggest you give more details in process report section next time.

Thanks, Yidie