Tapio PitkärantaAalto University

What does the mirror tell us?

2500 years ago

Long history of collecting How we use and apply it is constantly

changing◦ From morbidity to funding

Current status in Finland

Currently CaseMix is used usually after the patient has left the hospital

Other domains:◦ Amazon.com: ”Customers who bought this book,

also bought…”vs. ”Physicians who had a patient like you now have, did this and that?”

Utilize information organizations collect General purpose

◦ Methods that suit various domains Scalability

◦ Hundreds of millions of data sets on a regular desktop hardware

Flexibility◦ Methods that can be empowered with semantic

information extracted from the classification structures

The data space is uncertain The data is uncertain

◦ We must acknowledge this while evaluating methods

◦ Methods that provide “exact” results should be discarded?

In Finland ~ one million inpatients per year

We have collected data from the 1960’s◦ Could have millions of patient care episodes

Software agents: Multi-Agent Community◦ Commander◦ Data Crawler◦ Integrator◦ Aggregator

DM & IR

Represent coded data sets as vectors Similarity functions

◦ Cosine Angle Distance◦ Euklidean Distance

Documentation assistant

Patient arrives to the office of a very busy physician…

Material |D| Size (MB)

M1k 1 000 0.26

M10k 10 000 2.54

M100k 100 000 23.60

M1000k 1 000 000 235.00

M10000k 10 000 000 2351.00

M100000k 100 000 000 24534.00

The proposed system is able to produce fairly accurate results

The proposed system is able to handle large amounts of data

IR model provides flexibility, good scalability and high performance

Ideas, questions...?