week 3

Question 1

2 components of data visualization

Answer 1

1- how to read graph
2- what insights to generate

Question 2

what is scatter plot

Answer 2

simple plot (x,y) to display values for typically 2 variables

Question 3

geographical visulization graph is

Answer 3

vertices associated with locations (x/y axis associated with longitude and latitude)

Question 4

Heat maps are

Answer 4

2 dimensionally represent your data

Question 5

colour maps

Answer 5

summarize hundreds of rows of data like how polygons reps a state on usa map

Question 6

advatnage visualize over summary stats

Answer 6

convey results not just one dimensional data
o Simple stats like mean etc. provide 1 type of info

Question 7

how does ggplot work and whats it advantage

Answer 7

work by adding layers to plots, easier to code multiple functions
o Advantages: Better images visualizations and easier to code

Question 8

3 elements of ggplot are at least

Answer 8

1- dataframe
2- aes mapping:how variables in data frame, how they need to be plotted, where you define x and y axis including colour etc
3- geom object: determine how values are shown graphically, scatter, line polygon

Question 9

common issue/ important things with graphs

Answer 9

o Use labels consistently
o Colour should convey a message
o Make easy to read
o Keep alignment of labels consistent
o Have a sequence or order
o Too many label points= too hard to read
scale properly
make sure visual rep correct

pick graph with most insights