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Terry Elliott

ScienceDirect - Information & Management : The mediation of external variables in the techn... - 0 views

www.sciencedirect.com.libsrv.wku.edu/science

shared by Terry Elliott on 13 Feb 09 - No snapshot
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  • In the past decades, there have been large investments in information technology; in 1999, for example, the IT budget of Federal Express was reported to be US$ 1.4 billion [3]. If companies are to make a return from their IT investments, the new systems must be utilized effectively. Unfortunately, countless systems are never used to their full potential; many simply remain “unexplored, rejected, or forgotten” [45]. Understanding the determinants of system use is therefore a cornerstone of IS research [21].
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    • Terry Elliott
      Terry Elliott on 13 Feb 09
       
      systems flowchart of TAM
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  • To perform our analysis we used a Partial Least Squares and Structural Equation Modeling tool (PLS-GRAPH Version 3.00 build 279). SEM allows researchers to simultaneously examine the structural component (path model) and measurement component (factor model) in the one model.

    We performed our validation by constructing two PLS models, one for each application. The internal consistency (reliability) statistics for all constructs in both models were above 0.96. This exceeded the 0.7 rule-of-thumb [26] and confirmed the scales’ reliability. We tested convergent validity by examining whether all items loaded highly on their respective construct in PLS. A common rule-of-thumb is a loading greater than 0.7 [63]. In the email and word processor models, all items loaded on their constructs from 0.87 to 0.96, indicating convergent validity. To test discriminant validity, we tested the item-to-total correlations for each system. As shown in Table 3 and Table 4, the items loaded cleanly on each construct, indicating good discriminant validity.

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