Description: 1. Title: Wisconsin Breast Cancer Database (January 8, 1991)

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The data set (and description) can be downloaded here: http://archive.ics.uci.edu/ml/machine-learning-databases/breast-cancer-wisconsin/breast-cancer-wisconsin.data Description: 1. Title: Wisconsin Breast Cancer Database (January 8, 1991) 2. Sources: -- Dr. WIlliam H. Wolberg (physician) University of Wisconsin Hospitals Madison, Wisconsin USA -- Donor: Olvi Mangasarian (mangasarian@cs.wisc.edu) Received by David W. Aha (aha@cs.jhu.edu) -- Date: 15 July 1992 3. Past Usage: Attributes 2 through 10 have been used to represent instances. Each instance has one of 2 possible classes: benign or malignant. 1. Wolberg,~W.~H., \& Mangasarian,~O.~L. (1990). Multisurface method of pattern separation for medical diagnosis applied to breast cytology. In {\it Proceedings of the National Academy of Sciences}, {\it 87}, 9193--9196. -- Size of data set: only 369 instances (at that point in time) -- Collected classification results: 1 trial only -- Two pairs of parallel hyperplanes were found to be consistent with 50% of the data -- Accuracy on remaining 50% of dataset: 93.5% -- Three pairs of parallel hyperplanes were found to be consistent with 67% of data -- Accuracy on remaining 33% of dataset: 95.9%

2. Zhang,~J. (1992). Selecting typical instances in instance-based learning. In {\it Proceedings of the Ninth International Machine Learning Conference} (pp. 470--479). Aberdeen, Scotland: Morgan Kaufmann. -- Size of data set: only 369 instances (at that point in time) -- Applied 4 instance-based learning algorithms -- Collected classification results averaged over 10 trials -- Best accuracy result: -- 1-nearest neighbor: 93.7% -- trained on 200 instances, tested on the other 169 -- Also of interest: -- Using only typical instances: 92.2% (storing only 23.1 instances) -- trained on 200 instances, tested on the other 169 4. Relevant Information: Samples arrive periodically as Dr. Wolberg reports his clinical cases. The database therefore reflects this chronological grouping of the data. This grouping information appears immediately below, having been removed from the data itself: Group 1: 367 instances (January 1989) Group 2: 70 instances (October 1989) Group 3: 31 instances (February 1990) Group 4: 17 instances (April 1990) Group 5: 48 instances (August 1990) Group 6: 49 instances (Updated January 1991) Group 7: 31 instances (June 1991) Group 8: 86 instances (November 1991) ----------------------------------------- Total: 699 points (as of the donated datbase on 15 July 1992) Note that the results summarized above in Past Usage refer to a dataset of size 369, while Group 1 has only 367 instances. This is because it originally contained 369 instances; 2 were removed. The following statements summarizes changes to the original Group 1's set of data:

##### Group 1 : 367 points: 200B 167M (January 1989) ##### Revised Jan 10, 1991: Replaced zero bare nuclei in 1080185 & 1187805 ##### Revised Nov 22,1991: Removed 765878,4,5,9,7,10,10,10,3,8,1 no record ##### : Removed 484201,2,7,8,8,4,3,10,3,4,1 zero epithelial ##### : Changed 0 to 1 in field 6 of sample 1219406 ##### : Changed 0 to 1 in field 8 of following sample: ##### : 1182404,2,3,1,1,1,2,0,1,1,1 5. Number of Instances: 699 (as of 15 July 1992) 6. Number of Attributes: 10 plus the class attribute 7. Attribute Information: (class attribute has been moved to last column) # Attribute Domain -- ----------------------------------------- 1. Sample code number id number 2. Clump Thickness 1-10 3. Uniformity of Cell Size 1-10 4. Uniformity of Cell Shape 1-10 5. Marginal Adhesion 1-10 6. Single Epithelial Cell Size 1-10 7. Bare Nuclei 1-10 8. Bland Chromatin 1-10 9. Normal Nucleoli 1-10 10. Mitoses 1-10 11. Class: (2 for benign, 4 for malignant) 8. Missing attribute values: 16 There are 16 instances in Groups 1 to 6 that contain a single missing (i.e., unavailable) attribute value, now denoted by "?". 9. Class distribution: Benign: 458 (65.5%) Malignant: 241 (34.5%)

Citation Request: This breast cancer databases was obtained from the University of Wisconsin Hospitals, Madison from Dr. William H. Wolberg. If you publish results when using this database, then please include this information in your acknowledgements. Also, please cite one or more of: 1. O. L. Mangasarian and W. H. Wolberg: "Cancer diagnosis via linear programming", SIAM News, Volume 23, Number 5, September 1990, pp 1 & 18. 2. William H. Wolberg and O.L. Mangasarian: "Multisurface method of pattern separation for medical diagnosis applied to breast cytology", Proceedings of the National Academy of Sciences, U.S.A., Volume 87, December 1990, pp 9193-9196. 3. O. L. Mangasarian, R. Setiono, and W. H. Wolberg: "Pattern recognition via linear programming: Theory and application to medical diagnosis", in: "Large-scale numerical optimization", Thomas F. Coleman and Yuying Li, editors, SIAM Publications, Philadelphia 1990, pp 22-30. 4. K. P. Bennett & O. L. Mangasarian: "Robust linear programming discrimination of two linearly inseparable sets", Optimization Methods and Software 1, 1992, 23-34 (Gordon & Breach Science Publishers). Please refer to the repository http://archive.ics.uci.edu/ml (see citation policy). See also Frank, A. & Asuncion, A. (2010). UCI Machine Learning Repository [http://archive.ics.uci.edu/ml]. Irvine, CA: University of California, School of Information and Computer Science. Descriptive statistics: Dataset= breast-cancer-wisconsin : n= 699, d= 9

Class1: n= 458 Covariance matrix: [1,] 2.8033 0.4431 0.5052 0.4470 0.2722 0.2176 0.2254 0.3935-0.0322 [2,] 0.4431 0.8239 0.6432 0.3406 0.3897 0.4413 0.3020 0.5465 0.0187 [3,] 0.5052 0.6432 0.9957 0.3129 0.3602 0.3603 0.2574 0.4771-0.0019 [4,] 0.4470 0.3406 0.3129 0.9937 0.3456 0.3151 0.2106 0.4081 0.0272 [5,] 0.2722 0.3897 0.3602 0.3456 0.8411 0.2726 0.2002 0.4968-0.0076 [6,] 0.2176 0.4413 0.3603 0.3151 0.2726 1.5031 0.2471 0.2902 0.0552 [7,] 0.2254 0.3020 0.2574 0.2106 0.2002 0.2471 1.1671 0.4412-0.0239 [8,] 0.3935 0.5465 0.4771 0.4081 0.4968 0.2902 0.4412 1.1212 0.0253 [9,] -0.0322 0.0187-0.0019 0.0272-0.0076 0.0552-0.0239 0.0253 0.2520 Correlation matrix: [1,] 1.0000 0.2916 0.3024 0.2678 0.1773 0.1060 0.1246 0.2219-0.0384 [2,] 0.2916 1.0000 0.7102 0.3765 0.4682 0.3966 0.3080 0.5686 0.0411 [3,] 0.3024 0.7102 1.0000 0.3145 0.3936 0.2945 0.2387 0.4516-0.0037 [4,] 0.2678 0.3765 0.3145 1.0000 0.3780 0.2579 0.1955 0.3866 0.0543 [5,] 0.1773 0.4682 0.3936 0.3780 1.0000 0.2425 0.2020 0.5116-0.0166 [6,] 0.1060 0.3966 0.2945 0.2579 0.2425 1.0000 0.1866 0.2236 0.0897 [7,] 0.1246 0.3080 0.2387 0.1955 0.2020 0.1866 1.0000 0.3857-0.0440 [8,] 0.2219 0.5686 0.4516 0.3866 0.5116 0.2236 0.3857 1.0000 0.0477 [9,] -0.0384 0.0411-0.0037 0.0543-0.0166 0.0897-0.0440 0.0477 1.0000 Median: 3 1 1 1 2 2 2 1 1 Mean: 2.9563 1.3253 1.4432 1.3646 2.1201 2.3712 2.1004 1.2904 1.0633 MCD-estimated: MDC-0.975-Mean: 2.7605 1 1.2158 1.2395 1.9974 2.2395 1.9868 1.1053 1.0526 MDC-0.750-Mean: 2.7605 1 1.2158 1.2395 1.9974 2.2395 1.9868 1.1053 1.0526 MDC-0.500-Mean: 2.7605 1 1.2158 1.2395 1.9974 2.2395 1.9868 1.1053 1.0526

Class2: n= 241 Covariance matrix: [1,] 5.8993 0.6379 0.6986-1.1448 0.0790-0.4450-0.0959-0.1024 0.7221 [2,] 0.6379 7.3957 5.0279 2.7892 3.0574-0.3889 2.3869 2.7621 1.6779 [3,] 0.6986 5.0279 6.5641 2.1794 2.3861-0.2429 1.9617 2.6854 1.3727 [4,] -1.1448 2.7892 2.1794 10.3071 1.6190-1.5845 2.4239 1.9378 1.6968 [5,] 0.0790 3.0574 2.3861 1.6190 6.0104-0.1446 1.1812 1.8577 2.1149 [6,] -0.4450-0.3889-0.2429-1.5845-0.1446 7.1115-0.6234 0.3222 0.0748 [7,] -0.0959 2.3869 1.9617 2.4239 1.1812-0.6234 5.1704 1.9096 0.3373 [8,] -0.1024 2.7621 2.6854 1.9378 1.8577 0.3222 1.9096 11.2270 1.8852 [9,] 0.7221 1.6779 1.3727 1.6968 2.1149 0.0748 0.3373 1.8852 6.5430 Correlation matrix: [1,] 1.0000 0.0966 0.1123-0.1468 0.0133-0.0687-0.0174-0.0126 0.1162 [2,] 0.0966 1.0000 0.7216 0.3195 0.4586-0.0536 0.3860 0.3031 0.2412 [3,] 0.1123 0.7216 1.0000 0.2650 0.3799-0.0356 0.3367 0.3128 0.2095 [4,] -0.1468 0.3195 0.2650 1.0000 0.2057-0.1851 0.3320 0.1801 0.2066 [5,] 0.0133 0.4586 0.3799 0.2057 1.0000-0.0221 0.2119 0.2262 0.3372 [6,] -0.0687-0.0536-0.0356-0.1851-0.0221 1.0000-0.1028 0.0361 0.0110 [7,] -0.0174 0.3860 0.3367 0.3320 0.2119-0.1028 1.0000 0.2506 0.0580 [8,] -0.0126 0.3031 0.3128 0.1801 0.2262 0.0361 0.2506 1.0000 0.2200 [9,] 0.1162 0.2412 0.2095 0.2066 0.3372 0.0110 0.0580 0.2200 1.0000 Median: 7.2026 6.5243 6.5108 5.4833 5.1199 4.5161 6.0056 5.9256 2.3489 Mean: 7.195 6.5726 6.5602 5.5477 5.2988 4.6763 5.9793 5.8631 2.5892 MCD-estimated: MDC-0.975-Mean: 7.2171 6.5814 6.6899 6.3333 5.3101 3 6.3023 5.6047 2.5349 MDC-0.750-Mean: 7.2171 6.5814 6.6899 6.3333 5.3101 3 6.3023 5.6047 2.5349 MDC-0.500-Mean: 7.2171 6.5814 6.6899 6.3333 5.3101 3 6.3023 5.6047 2.5349 Measures: Mah.Dist: 4.2448

Mah.Dist-MCD-0.975: 4.0757 Mah.Dist-MCD-0.750: 4.0757 Mah.Dist-MCD-0.500: 4.0757

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