Lab 2 - Challenge Question 1

[SalvadorW2]

I've done the standard calculation for determining value per land area: total value / total area. Then, I've made a variable for value per acre greater than 1,000,000.

valperacre <- ( downtown$assessedval / downtown$acres )
milperacre <- ( valperacre > 1000000 )

However, when I then plug "milperacre" into the map formula, the map I get contains far more red area than the one in the lab instructions.

these <- milperacre                                       # define your group
group.colors <- ifelse( these, "firebrick", "gray80" )    # don't change this
plot( downtown,  border="gray70", col=group.colors )      # don't change this

Am I going about this the wrong way?

[lecy]

The question asks about assessed LAND value, not assessed value. The variable names need to be updated in the data dictionary but you can see the two definitions here:

https://ds4ps.org/Data-Science-Class/DATA/syr_parcels.html

Try:

value.acre <- downtown$assessedland / downtown$acres

[lecy]

Note the format for code highlighting on GitHub. Put fences around code:

```r
valperacre <- ( downtown$assessedval / downtown$acres )
milperacre <- ( valperacre > 1000000 )

To get: 

```r
valperacre <- ( downtown$assessedval / downtown$acres )
milperacre <- ( valperacre > 1000000 )

[jamisoncrawford]

Ah, thank you @lecy for that!

[jamisoncrawford]

Edit: Deleted my original post as not to mislead - thanks again, @lecy!