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Slide 1

Overview of Link Plus

Probabilistic Record Linkage Software

logo NPCR National Program of Cancer Registries

Logo Registry Plus

Logo Department of Health and Human Services

Logo of Centers for Disease Control and Prevention

Slide 2

Acknowledgements

Slides adapted from training materials developed by CDC-NPCR Faculty:
Melissa Jim, CDC/IHS melissa.jim@ihs.gov
David Espey, CDC/IHS david.espey@ihs.gov

CDC/Link Plus development and training:
Kathleen Thoburn
David Gu

Adapted by:
Megan Hoopes, NW Tribal Epidemiology Center ideanw@npaihb.org

logo NPCR National Program of Cancer Registries

Logo of Centers for Disease Control and Prevention

Logo Department of Health and Human Services

Slide 3

Slide 4

Link Plus Software

Slide 5

Link Plus Is Free

$0.00

Slide 6

Link Plus Is Easy To Use

Link Plus gets you from HERE:

Cancer Registry data for John Smith:

Last name First Name Site SSN DOB Sex DateDx
SMITH JOHN C619 123654789 02111934 1 06152004

Vital Statistics data for John Smith:

Last name First Name DOB Date of Death COD Death Cert #
SMITH JOHN 02011934 03202006 123654789 01234

Slide 7

Link Plus Is Easy To Use

To HERE:

Linked data for John Smith:

Last name First Name Site SSN DOB Sex DateDx Date of Death COD Death Cert #
SMITH JOHN C619 123654789 02011934 1 06152004 03202006 C100 01234

Slide 8

Link Plus Is Easy To Use

Without having to go HERE:

Two complex statistical equations used as examples of what is NOT required due to the fact that Link Plus is easy to use and the mathematics are largely hidden from the user.

Slide 9

Link Plus Is Easy To Use

Slide 10

Using Link Plus

Slide 11

Obtaining/Updating Link Plus

logo NPCR National Program of Cancer Registries

Logo Registry Plus

  1. Go to NPCR Home Page http://www.cdc.gov/cancer/npcr
  2. In the 'Software and Tools' Section
    - click on Registry Plus
  3. Under 'Registry Plus Components'
    - click on Link Plus - Download

Slide 12

Getting Started

Slide 13

Data Cleaning Tips

Slide 14

Linkage Overview

Two main types of linkage:

Slide 15

Linkage configuration screen

Image of Link Plus Linkage Configuration screen.

Slide 16

File Import File 1 versus File 2

Image of Data Type area of Link Plus Linkage Configuration screen showing Data Type and File 1 and File 2 fields.

Slide 17

File Layout

Slide 18

Blocking Variables

Image of Select Blocking Variables area of Link Plus Linkage Configuration screen showing Data Item (File 1), Data Item (File 2), and Phonetic System fields.

Slide 19

Phonetic Systems

Soundex

Slide 20

Phonetic Systems

New York State Identification and Intelligence System (NYSIIS)

Slide 21

Matching Variables

Image of Select Matching Variables and Methods area of Link Plus Linkage Configuration screen showing Data Item (File 1), Data Item (File 2), and Matching Method fields.

Slide 22

Matching Methods

Slide 23

Matching Methods

Slide 24

Matching Methods

Slide 25

Missing Values

Slide 26

Missing Values

Image of setting the date in the Missing Value (File 2) field of the Link Plus Configuration screen.

Slide 27

Direct Method

Slide 28

EM Algorithm

Slide 29

Cut Off Value

Slide 30

Manual Review of Uncertain Matches

Graphic of Link Plus Linkage Report screen showing uncertain matches highlighted for manual review.

Slide 31

Manual Review of Uncertain Matches

Graphic of Link Plus Assign Match Status dialog showing the Select all as true matches radio button selected.

Slide 32

Manual Review of Uncertain Matches

Slide 33

Manual Review of Uncertain Matches

Slide 34

Tips for Manual Review

Slide 35

Helpful Link Plus Tips


Internet Citation: Overview of Link Plus. Healthcare Cost and Utilization Project (HCUP). August 2014. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/datainnovations/raceethnicitytoolkit/or17.jsp.
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Last modified 8/5/14