Download presentation

Presentation is loading. Please wait.

Published byGisselle Sager Modified over 2 years ago

1
RSES – reducts and discretization of attributes presented by Zbigniew W. Ras University of North Carolina, Charlotte, NC & Warsaw University of Technology, Poland College of Computing and Informatics University of North Carolina, Charlotte www.kdd.uncc.edu

2
abcdf x10L0L0 x20R1L1 x30L0L0 x40R1L1 x51R0L2 x61R0L2 x72S2H3 x82S2H3 x1 x2bc x3-bc x4bc- x5abacabac x6abacabac- x7abcd x8abcd - x1x2x3x4x5x6x7x8 Discernibility Matrix Information System Discernibility Function: f(a, b, c, d) = (b + c) (a + b) (a + b + c + d) (a + c) =(b + c) (a + b) (a + c) = (ba + bb + ca + cb) (a + c) = (b + ca) (a + c) ba + bc + ca Possible coverings:{b, a}, {c, a},{c, b} (b=L) (f=0); (a=0)*(b=R) (f=1); ……

3
Discretization of numerical attributes Xabd x10.821 x210.50 x31.330 x41.411 x51.420 x61.631 x71.311 p1 p2 p3 p4 q1 q2 q3 Dom(a) = {0.8, 1, 1.3, 1.4, 1.6}, Dom(b) = {0.5, 1, 2, 3} Va = [0, 2), Vb = [0, 4) G(x1,x2)=p1+q1+q2 G(x1,x3)=p1+p2+q3 G(x1,x5)=p1+p2+p3 G(x2,x4)=p2+p3+q1 G(x2,x6)=p2+p3+p4+q1+q2+q3 G(x2,x7)=p2+q1 G(x3,x4)=p3+q2+q3 G(x3,x6)=p3+p4 G(x3,x7)=q2+q3 G(x4,x5)=q2 G(x5,x6)=p4+q3 G(x5,x7)=p3+q2 P1P2P2 P3P3 P4Q1Q2Q3 x1,x311 1 x1,x5111 x2,x4 x2,x7 1 1 x3,x6 11 x5,x6 1 1

4
p(1, a)p(2, a)p(3, a)p(4, a)p(1, b)p(2, b)p(3, b)d* (x1, x2)10001101 (x1, x3)11000011 (x1, x5)11100001 (x4, x2)01101001 (x4, x3)00100111 (x4, x5)00000101 (x6, x2)01111111 (x6, x3)00110001 (x6, x5)00010011 (x7, x2)01001001 (x7, x3)00000111 (x7, x5)00100101 new00000000 Step 1.Choose a column from B with the maximal number of occurrences of 1’s. Step 2. Delete from B the column chosen in Step 2 and all rows marked in this column by 1. Step 3.If B is non-empty go to step 2 else Stop.

5
Thank You Questions?

Similar presentations

OK

Adding & Subtracting Mixed Numbers. Objective:. 7.1.02 To develop fluency in +, –, x, and ÷ of non-negative rational numbers. Essential Question: How.

Adding & Subtracting Mixed Numbers. Objective:. 7.1.02 To develop fluency in +, –, x, and ÷ of non-negative rational numbers. Essential Question: How.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Elaine marieb anatomy and physiology ppt on cells Ppt on supply chain management of dell Ppt on emotional intelligence in leadership Ppt on live line maintenance tools Ppt on electricity and circuits Ppt on reflection of light for class 8 Ppt on power system Convert word doc to ppt online reader Ppt on operating system overview Ppt on second law of thermodynamics and entropy