Hi All,
How many scal items is the minimum requirement statistically to be used in smartPLS, forexample if a construct is a formative of two or three subconstructs/scales. how many statements/items is needed to measure each subconstruct/scale.
In my case I have a construct called usage (which is part of a bigger model)... Usage construct consist or made from four subconstructs namely ( PP, PC,PL, CP)..the question.. is one statement for each subconstruct is enough statistically to give measurement for the construct(usgage) ?
If not how many is required.
Many thanks for your help.
Regards,
Talal PhD candidate Marketing
Item per construct
Item per construct
Talal Almeshal
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Hi,
With formative indicators, the LV is defined by its indicators, and the number will be a matter of definition.
In the reflective way, the indicators are a sample of all possible indicators (from the domain of the definition of the LV).
PLS is “consistent at large”, that means that a “generous” number of indicators per LV should be used.
LOHMÖLLER, J.-B. Latent variable path modeling with partial least squares. Heidelberger: Physica-Verlag, 1989.
(P.215) “If there are three indicators, the estimate of the LV is too close of the data and the relations between LVs are underestimated.”
CHIN, W. W.; NEWSTED, P. R. Structural equation modeling analysis with small samples using partial least squares. In: R. H. Hoyle (Ed.); Statistical strategies for small sample research. p.307-341, 1999. Thousand Oaks, CA: Sage Publications.
(p.333) 4 or 8 indicators.
ESPOSITO VINZI, V.; TRINCHERA, L.; AMATO, S. PLS path modeling: from foundations to recent developments and open issues for model assessment and improvement. In: V. Esposito Vinzi; W. W. Chin; J. Henseler; H. Wang (Eds.); Handbook of partial least squares. p.47-82, 2010. Berlin, Heidelberg: Springer Berlin Heidelberg.
(p.266) = at least 4 indicators
KRISTENSEN, K.; ESKILDSEN, J. Design of PLS-based satisfaction studies. In: V. Esposito Vinzi; W. W. Chin; J. Henseler; H. Wang (Eds.); Handbook of partial least squares. p.247-277, 2010. Berlin, Heidelberg: Springer Berlin Heidelberg.
(p.265) about 4 indicators.
BIDO, D. S.; SILVA, D.; SOUZA, C. A.; GODOY, A. S. Mensuração com indicadores formativos nas pesquisas em administração de empresas: como lidar com a multicolinearidade entre eles? Administração: Ensino e Pesquisa, v. 11, n. 2, p. 245-269, 2010.
= at least 5 indicators (or reliability above 0.9 to minimize the attenuation).
Best regards,
Bido
With formative indicators, the LV is defined by its indicators, and the number will be a matter of definition.
In the reflective way, the indicators are a sample of all possible indicators (from the domain of the definition of the LV).
PLS is “consistent at large”, that means that a “generous” number of indicators per LV should be used.
LOHMÖLLER, J.-B. Latent variable path modeling with partial least squares. Heidelberger: Physica-Verlag, 1989.
(P.215) “If there are three indicators, the estimate of the LV is too close of the data and the relations between LVs are underestimated.”
CHIN, W. W.; NEWSTED, P. R. Structural equation modeling analysis with small samples using partial least squares. In: R. H. Hoyle (Ed.); Statistical strategies for small sample research. p.307-341, 1999. Thousand Oaks, CA: Sage Publications.
(p.333) 4 or 8 indicators.
ESPOSITO VINZI, V.; TRINCHERA, L.; AMATO, S. PLS path modeling: from foundations to recent developments and open issues for model assessment and improvement. In: V. Esposito Vinzi; W. W. Chin; J. Henseler; H. Wang (Eds.); Handbook of partial least squares. p.47-82, 2010. Berlin, Heidelberg: Springer Berlin Heidelberg.
(p.266) = at least 4 indicators
KRISTENSEN, K.; ESKILDSEN, J. Design of PLS-based satisfaction studies. In: V. Esposito Vinzi; W. W. Chin; J. Henseler; H. Wang (Eds.); Handbook of partial least squares. p.247-277, 2010. Berlin, Heidelberg: Springer Berlin Heidelberg.
(p.265) about 4 indicators.
BIDO, D. S.; SILVA, D.; SOUZA, C. A.; GODOY, A. S. Mensuração com indicadores formativos nas pesquisas em administração de empresas: como lidar com a multicolinearidade entre eles? Administração: Ensino e Pesquisa, v. 11, n. 2, p. 245-269, 2010.
= at least 5 indicators (or reliability above 0.9 to minimize the attenuation).
Best regards,
Bido