Variance of means versus mean of variances: A contrarian view on operationalizing group dispersion

Hock Peng Sin; Daniel A. Newman

Variance of means versus mean of variances: A contrarian view on operationalizing group dispersion

Research output: Contribution to conference › Paper › peer-review

Abstract

Common practice in calculating within-group dispersion (VARwg and SDwg) and within-group agreement (rwg) includes first estimating within-group variance at the item level, then averaging across item-level variances. Using classical test theory, we illustrate problems with the common approach. Estimating dispersion and agreement via scale scores is recommended, and implications of item-specific and raterspecific variance for indexing substantive dispersion constructs are discussed.

Original language	English (US)
State	Published - 2005
Externally published	Yes
Event	65th Annual Meeting of the Academy of Management, AOM 2005 - Honolulu, HI, United States Duration: Aug 5 2005 → Aug 10 2005

Other

Other	65th Annual Meeting of the Academy of Management, AOM 2005
Country/Territory	United States
City	Honolulu, HI
Period	8/5/05 → 8/10/05

Keywords

Within-group agreement
Within-group dispersion
Within-group variance

ASJC Scopus subject areas

Information Systems and Management

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title = "Variance of means versus mean of variances: A contrarian view on operationalizing group dispersion",

abstract = "Common practice in calculating within-group dispersion (VARwg and SDwg) and within-group agreement (rwg) includes first estimating within-group variance at the item level, then averaging across item-level variances. Using classical test theory, we illustrate problems with the common approach. Estimating dispersion and agreement via scale scores is recommended, and implications of item-specific and raterspecific variance for indexing substantive dispersion constructs are discussed.",

keywords = "Within-group agreement, Within-group dispersion, Within-group variance",

author = "Sin, {Hock Peng} and Newman, {Daniel A.}",

year = "2005",

language = "English (US)",

note = "65th Annual Meeting of the Academy of Management, AOM 2005 ; Conference date: 05-08-2005 Through 10-08-2005",

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T1 - Variance of means versus mean of variances

T2 - 65th Annual Meeting of the Academy of Management, AOM 2005

AU - Sin, Hock Peng

AU - Newman, Daniel A.

PY - 2005

Y1 - 2005

N2 - Common practice in calculating within-group dispersion (VARwg and SDwg) and within-group agreement (rwg) includes first estimating within-group variance at the item level, then averaging across item-level variances. Using classical test theory, we illustrate problems with the common approach. Estimating dispersion and agreement via scale scores is recommended, and implications of item-specific and raterspecific variance for indexing substantive dispersion constructs are discussed.

AB - Common practice in calculating within-group dispersion (VARwg and SDwg) and within-group agreement (rwg) includes first estimating within-group variance at the item level, then averaging across item-level variances. Using classical test theory, we illustrate problems with the common approach. Estimating dispersion and agreement via scale scores is recommended, and implications of item-specific and raterspecific variance for indexing substantive dispersion constructs are discussed.

KW - Within-group agreement

KW - Within-group dispersion

KW - Within-group variance

UR - http://www.scopus.com/inward/record.url?scp=84859055096&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859055096&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:84859055096

Y2 - 5 August 2005 through 10 August 2005

ER -

Variance of means versus mean of variances: A contrarian view on operationalizing group dispersion

Abstract

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Keywords

ASJC Scopus subject areas

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