Makes

Results

Research Question: What is the distribution of vehicle model makes in the target population?

The uncommon makes with observed counts less than 5 were combined into an “other” category. These uncommon makes are shown in Table 1.

Table 1: Uncommon Makes in Sample

make	count
"Pontiac"	1
"Alfa Romeo"	1
"Land Rover"	1
"Genesis"	1
"Saturn"	1
"Infiniti"	1
"Cadillac"	1
"Scion"	1
"Mini"	2
"RAM"	3
"Lexus"	3
"Suzuki"	3
"BMW"	4

In Figure 1, we plot the transformed abundances of the more common makes on the log scale.

Figure 1

Solid dots represent observed proportions in the sample. Error bars go out +/-1 simulated mean absolute error for each vehicle make.

Appendix: Sensitivity Analysis

Figure 2: Non-response Simulation. The estimate in orange (shown for comparison only) is the result of multiplying the observed proportions by N - n, where N is assumed to be 500000.