Table 1 Properties of different types of users
From: Detecting problematic transactions in a consumer-to-consumer e-commerce network
Seed user type | Normal | Fictive | Underwear | Medicine | Weapon |
|---|---|---|---|---|---|
Number of seed users | 999 | 440 | 468 | 469 | 416 |
Number of transactions involving the seed user | 151,021 | 66,215 | 151,278 | 92,497 | 81,970 |
Total number of transactions | 27,683,860 | 850,739 | 2,325,898 | 925,361 | 533,963 |
\(k_i=1\) | 587 (58.8%) | 8 (1.8%) | 3 (0.6%) | 2 (0.4%) | 5 (1.2%) |
Mean (\(k_i \mid k_i\ge 2\)) | 195.0 | 138.3 | 297.8 | 184.2 | 179.7 |
Median (\(k_i \mid k_i\ge 2\)) | 77.5 | 61.0 | 170.0 | 97.0 | 86.0 |
\(s_i=1\) | 587 (58.8%) | 8 (1.8%) | 3 (0.6%) | 2 (0.4%) | 5 (1.2%) |
Mean (\(s_i \mid s_i\ge 2\)) | 365.1 | 153.3 | 325.3 | 198.1 | 199.4 |
Median (\(s_i \mid s_i\ge 2\)) | 89.0 | 66.5 | 175.0 | 100.0 | 90.0 |
\(s_i\ge 2\) | 412 | 432 | 465 | 467 | 411 |
\(s_i/k_i=1\) | 97 (23.5%) | 97 (22.5%) | 86 (18.5%) | 156 (33.4%) | 121 (29.4%) |
Mean (\(s_i/k_i \mid s_i/k_i>1\)) | 1.413 | 1.135 | 1.055 | 1.066 | 1.092 |
Median (\(s_i/k_i \mid s_i/k_i>1\)) | 1.124 | 1.059 | 1.03 | 1.031 | 1.055 |
\(k_i\ge 2\) | 412 | 432 | 465 | 467 | 411 |
\({{\mathrm {SP}}}_i=1\) | 157 (38.1%) | 15 (3.5%) | 21 (4.5%) | 16 (3.4%) | 17 (4.1%) |
\(k_i^{{\mathrm {out}}}=1\) | 118 (28.6%) | 21 (4.9%) | 2 (0.4%) | 2 (0.4%) | 9 (2.2%) |
\(s_i\ge 2\) | 412 | 432 | 465 | 467 | 411 |
\({\mathrm {WSP}}_i=1\) | 157 (38.1%) | 15 (3.5%) | 21 (4.5%) | 16 (3.4%) | 17 (4.1%) |
\(s_i^{{\mathrm {out}}}=1\) | 118 (28.6%) | 14 (3.2%) | 2 (0.4%) | 2 (0.4%) | 9 (2.2%) |
\(k_i\ge 2\) | 412 | 432 | 465 | 467 | 411 |
\(C_i=0\) | 118 (28.6%) | 152 (35.2%) | 108 (23.2%) | 154 (33.0%) | 128 (31.1%) |
Mean (\(C_i \mid C_i>0\)) | \(8.554\times 10^{-3}\) | \(8.348\times 10^{-3}\) | \(9.500\times 10^{-4}\) | \(2.231\times 10^{-3}\) | \(3.810\times 10^{-3}\) |
Median (\(C_i \mid C_i>0\)) | \(2.411\times 10^{-3}\) | \(2.039\times 10^{-3}\) | \(5.288\times 10^{-4}\) | \(6.494\times 10^{-4}\) | \(1.337\times 10^{-3}\) |
\({\mathrm {Tr}}_i\ge 2\) | 262 | 241 | 317 | 251 | 244 |
\(m_i=0\) | 17 (6.5%) | 27 (11.2%) | 54 (17.0%) | 44 (17.5%) | 32 (13.1%) |
\(m_i=1\) | 12 (4.6%) | 9 (3.7%) | 4 (1.3%) | 6 (2.4%) | 11 (4.5%) |
Mean (\(m_i \mid m_i>0\)) | \(8.554\times 10^{-3}\) | \(8.348\times 10^{-3}\) | \(9.500\times 10^{-4}\) | \(2.231\times 10^{-3}\) | \(3.810\times 10^{-3}\) |
Median (\(m_i \mid m_i>0\)) | \(2.411\times 10^{-3}\) | \(2.039\times 10^{-3}\) | \(5.288\times 10^{-4}\) | \(6.494\times 10^{-4}\) | \(1.337\times 10^{-3}\) |
\({\mathrm {FF}}_i+{\mathrm {CY}}_i\ge 1\) | 294 | 280 | 357 | 313 | 283 |
\({\mathrm {CYP}}_i=0\) | 234 (79.6%) | 188 (67.1%) | 222 (62.2%) | 227 (72.5%) | 202 (71.4%) |
Mean (\({\mathrm {CYP}}_i \mid {\mathrm {CYP}}_i>0\)) | \(1.987\times 10^{-2}\) | \(7.367\times 10^{-2}\) | \(6.739\times 10^{-2}\) | \(8.551\times 10^{-2}\) | \(5.544\times 10^{-2}\) |
Median (\({\mathrm {CYP}}_i \mid {\mathrm {CYP}}_i>0\)) | \(1.521\times 10^{-2}\) | \(4.481\times 10^{-2}\) | \(3.396\times 10^{-2}\) | \(3.822\times 10^{-2}\) | \(3.618\times 10^{-2}\) |