4. Suppose we have the following data from n patients: Patient 1 Patient 2 Patient 3 Age Weight Height Gender Blood Pressure 211 214 212 213 722 223 721 231 1 Patient n 1 232 ⠀ 233 ⠀ 724 234 1 ? 225 ? Zn5 .... Sharp Pain Zim 72m 23m ⠀ Znm where some entries in the column Blood Pressure are missing (represented by the symbol "?"), and other columns are fully observed. • Give an algorithm to estimate these missing values based on the current data matrix. • How can we estimate the missing values if some of the observed entries are corrupted?

4. Suppose we have the following data from n patients: Patient 1 Patient 2 Patient 3 Age Weight Height Gender Blood Pressure 211 214 212 213 722 223 721 231 1 Patient n 1 232 ⠀ 233 ⠀ 724 234 1 ? 225 ? Zn5 .... Sharp Pain Zim 72m 23m ⠀ Znm where some entries in the column Blood Pressure are missing (represented by the symbol "?"), and other columns are fully observed. • Give an algorithm to estimate these missing values based on the current data matrix. • How can we estimate the missing values if some of the observed entries are corrupted?

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

4. Suppose we have the following data from n patients:
Weight Height
212
213
Patient 1
Patient 2
Patient 3
Age
211
221
⠀
Patient n 21
722
232
⠀
Zn2
723
233
⠀
Zn3
Gender Blood Pressure
?
214
724
225
234
⠀
Zn4
Zn5
Sharp Pain
Zim
22m
23m
⠀
Znm
where some entries in the column Blood Pressure are missing (represented by the symbol "?"), and other
columns are fully observed.
Give an algorithm to estimate these missing values based on the current data matrix.
• How can we estimate the missing values if some of the observed entries are corrupted?

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