year

In an similar fashion, once you know the total number of baptisms for boys and girls in $1629,$ you can compute the ratio of the number of boys to the number of girls baptized with the following code:

$5218/4683$

Alternatively, you could calculate this ratio for every year by acting on the complete boys and girls columns, and then save thos cal$$ulations into a new variable named boy$\_$t$\_$girl$\_$ratio :

You can also compute the proportion of newborns that are boys in $1629$ with the following code:

Or you can compute this for all years simultaneously and add it as a new variable named boy$\_$rat io to the dataset:Notice that rather than dividing by boys $+$ girls we are using the total variable we created earlier in our calculations!Now, generate a plot of the proportion of boys born over time. What do you see?

Tip: If you use the up and down arrow keys in the console, you can scroll through your previous commands, your so$-$called command history. You can also access your command history by clicking on the history tab in the upper right panel: This can save you a lot of typing in the future.

Finally, in addition to simple mathematical operators like subtraction and division, you can ask $R$ to make comparisons like greater than, $>,$ less than, and equality, $==.$ For example, we can create a new variable called more$\_$boys that tells us whether the number of births of boys outnumbered that of girls in each year with the following code: