Srivastava J., Cooley R., Deshpande M, Tan P.N.

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Presentation transcript:

Web Usage Mining: Discovery and Applications of Usage Patterns from Web Data Srivastava J., Cooley R., Deshpande M, Tan P.N. Appeared in SIGKDD Explorations, Vol. 1, Issue 2, 2000

Web Mining What is? What kind of? Data Mining efforts associated with the Web What kind of? Content Mining Structure Mining Usage Mining

Web Data Content Structure Usage User profile Ex) texts and graphics Ex) HTML tags Usage Ex) IP address, page reference, date/time User profile Ex) registration data, customer profile

Web Usage Mining The application of data mining techniques to discover usage patterns from Web Data. Three phrases Preprocessing Pattern discovery Pattern analysis

Data Sources Where the usage data can be collected from? Server Level Collections The web server log records the browsing behavior of site visitors, but cached page views are not recorded. The packet sniffing extracts usage data directly from TCP/IP packets.

<Sample Web Server Log> Data Sources (contd.) <Sample Web Server Log> # IP Address Userid Time Method/ URL/ Protocol Status Size Referrer Agent 1 123.456.78.9 - [25/Apr/1998:03:04:41 -0500] "GET A.html HTTP/1.0" 200 3290 - Mozilla/3.04 (Win95, I) 2 123.456.78.9 - [25/Apr/1998:03:05:34 -0500] "GET B.html HTTP/1.0" 200 2050 A.html Mozilla/3.04 (Win95, I) 3 123.456.78.9 - [25/Apr/1998:03:05:39 -0500] "GET L.html HTTP/1.0" 200 4130 - Mozilla/3.04 (Win95, I) 4 123.456.78.9 - [25/Apr/1998:03:06:02 -0500] "GET F.html HTTP/1.0" 200 5096 B.html Mozilla/3.04 (Win95, I) 5 123.456.78.9 - [25/Apr/1998:03:06:58 -0500] "GET A.html HTTP/1.0" 200 3290 - Mozilla/3.01 (X11, I, IRIX6.2, IP22) 6 123.456.78.9 - [25/Apr/1998:03:07:42 -0500] "GET B.html HTTP/1.0" 200 2050 A.html Mozilla/3.01 (X11, I, IRIX6.2, IP22) 7 123.456.78.9 - [25/Apr/1998:03:07:55 -0500] "GET R.html HTTP/1.0" 200 8140 L.html Mozilla/3.04 (Win95, I) 8 123.456.78.9 - [25/Apr/1998:03:09:50 -0500] "GET C.html HTTP/1.0" 200 1820 A.html Mozilla/3.01 (X11, I, IRIX6.2, IP22) 9 123.456.78.9 - [25/Apr/1998:03:10:02 -0500] "GET O.html HTTP/1.0" 200 2270 F.html Mozilla/3.04 (Win95, I) 10 123.456.78.9 - [25/Apr/1998:03:10:45 -0500] "GET J.html HTTP/1.0" 200 9430 C.html Mozilla/3.01 (X11, I, IRIX6.2, IP22) 11 123.456.78.9 - [25/Apr/1998:03:12:23 -0500] "GET G.html HTTP/1.0" 200 7220 B.html Mozilla/3.04 (Win95, I) 12 209.456.78.2 - [25/Apr/1998:05:05:22 -0500] "GET A.html HTTP/1.0" 200 3290 - Mozilla/3.04 (Win95, I) 13 209.456.78.3 - [25/Apr/1998:05:06:03 -0500] "GET D.html HTTP/1.0" 200 1680 A.html Mozilla/3.04 (Win95, I)

Data Sources (contd.) Client Level Collections By using remote agents ex) java applet (overhead), java script (not able to capture all user clicks) By modifying the source code of existing browser ex) Mosaic (hard to convince users to use browser)

Data Sources (contd.) Proxy Level Collections Intermediate level of caching between web server and client browser. Characterize the browsing behavior of a group of users sharing a common proxy server.

Data Abstractions User : a single individual that is accessing file from one or more Web servers through a browser Page Views : every file displayed on user’s browser at one time Click Stream : a sequential series of page view requests User Session : the click stream of page views for a single user across the entire Web Server Session : the set of page views in a user session for a particular Web site Episode : any semantically meaningful subset of a user or server session

Web Usage Mining Process

Preprocessing Usage Processing The most difficult task due to the incompleteness of the available data (IP address, agent, server side click stream) Single IP address/Multiple Server Sessions Multiple IP address/Single Server Session Multiple IP address/Single User Multiple Agent/Single User

Preprocessing(contd.) Content Preprocessing Converting the text, image, scripts into useful forms (ex. vectors of words) Classification/clustering algorithm can be used to filter discovered patterns based on topic or intended use Structure Preprocessing Hyperlinks between page views

Pattern Discovery Statistical Analysis Association Rules Clustering Page views, viewing time, length of navigational path Association Rules Apriori algorithm: correlation between users Clustering Usage clustering : inferring user demographics Page clustering: pages having related content

Pattern Discovery (contd.) Classification 30% of users who placed an online order in /Product/Music are in the 18-25 age group and live on the West Coast. Sequential Patterns Time-ordered set of sessions: predicting future visit patters for where to put advertisement

Pattern Analysis Motivation Filter out uninteresting rules / patterns from the set found in the pattern discovery phrase.

Application Areas

Examples Personalization Business http://aztec.cs.depaul.edu/scripts/ACR2/ Business http://www.accrue.com/