> amz[["Weight"]]
 [1] 0.47%  0.98%  1.11%  2.78%  1.38%  0.46%  0.30%  1.43%  0.60%  0.86% 
[11] 3.41%  0.38%  2.41%  14.20% 4.33%  5.04%  1.04%  0.36%  0.79%  0.66% 
[21] 0.54%  9.69%  3.43%  0.68%  4.58%  0.36%  4.41%  2.26%  1.65%  0.24% 
[31] 0.44%  2.57%  1.35%  2.32%  0.84%  3.18%  5.10%  0.21%  0.27%  1.35% 
[41] 1.89%  0.59%  1.29%  1.29%  0.99%  0.75%  0.77%  0.50%  1.02%  2.47% 
47 Levels: 0.21% 0.24% 0.27% 0.30% 0.36% 0.38% 0.44% 0.46% 0.47% ... 9.69%