# Environmental Data Analysis and Visualization

Postering 101

## Visualization critique

Center for Data Innovation

## Visualization critique

Our World In Data

## Visualization critique

Visual Capitalist

## Linear modeling

Unlike hypothesis tests, we are often making judgement calls about how well a model fits the data.

## Linear modeling

ggplot(treeDataNC,aes(x=DBH (cm),y=TreeHt (m))) +
geom_point() +
geom_smooth(method="lm",se=FALSE)

## Testing assumptions

Linearity: The relationship between X and the mean of Y is linear.

treeModel<-lm(TreeHt (m)~DBH (cm),data=treeDataNC)
plot(treeModel,which=1)

If plot is flat-ish, we can proceed…

## Testing assumptions

Normality: For any fixed value of X, Y is normally distributed.

 plot(treeModel,which=2)

If plot mostly adheres to diagonal line, we can proceed..

## Testing assumptions

Homoscedasticity: The variance of residual is the same for any value of X.

plot(treeModel,which=3)

If plot is mostly flat, we can proceed..

## Posters

• Show, don’t tell

• Consistent and clean layout; context oriented in a single direction

• Headings should clearly readable and convey the idea behind graphics or text sections

• Graphic elements should be able to be seen from 10 feet away

Wilke, Claus. 2019. Fundamentals of Data Visualization.

Wilke, Claus. 2019. Fundamentals of Data Visualization.

## Show, don’t tell

• Fewer words, bigger words

• Limit use of text (800-1200 words max)

• Graphics should be largely self-explantory

• The poster is meant to come with an interpreter: you!

## Activity: Draft a poster

Find a poster template or build your own!

• You can use your preferred platform, or there is a PowerPoint template on Canvas

If you have any draft graphics, you can also add these in the appropriate places to beginning filling out the space

Poster size should be 36 in wide by 48 inches

## Next week

• Tuesday I will be holding final project consultations on Zoom between 10 AM and 1PM. A signup will be posted shortly.

• If you need to discuss your project outside this time, please connect with me as soon as possible.

• Have a great weekend and a great break!