For this line graph excercise I wanted to stick with my eva dataset of the previous modules, because I preferred researching the technical aspect over the representational, as I am more familiar with the graphic side. The only problem (again) was that I needed an extra quantitative values for each 'date' row.
After reformatting my dataset in Google Spread Sheet, using the pivot table report. I had for each date of an extravehicular activity (eva) , the duration (minutes) of the eva, and the number of eva's on that day.
I am aware that a line graph of this data is not the ideal thing to do since:
NASA Data Source: https://data.nasa.gov/Raw-Data/Extra-vehicular-Activity-EVA-US-and-Russia/9kcy-zwvn
It seems that in the early 70s, there was a more irregular number of spacewalks, after that there were mostly 2 eva's per date, with 3 exceptions ( two in the ninetees, and one in 2010).