2.1 Study Design and Conceptual Framework
We used a quantitative, cross-sectional survey design, which — for a question this empirical, about whether specific financial factors predict infrastructure outcomes — seemed the more defensible choice over a purely qualitative or case-study approach, since it allows systematic measurement and statistical inference rather than narrative interpretation alone (Bolton & Foxon, 2014). The conceptual model specified five exogenous financial constructs — Project Finance Structure (PFS), Capital Efficiency (CE), Risk Allocation (RA), Financial Capability (FC), and Investment Performance (IP) — as predictors of a single outcome construct, Strategic Infrastructure Development (SID) (Dang & Pheng, 2014). We should note, plainly, that this is an associational rather than experimental design: no variables were manipulated, and causal language throughout this paper should be read with that caveat in mind. Ethical approval and participant consent procedures followed standard human-subjects research practice for anonymous, non-interventional survey research; no personally identifying information was collected, and participation was voluntary throughout.
2.2 Setting, Eligibility, and Sampling
Eligible participants were professionals based in the United States who were, at the time of the survey, actively engaged in financing, investing in, developing, or making financial decisions about energy infrastructure projects — spanning power generation, transmission, LNG facilities, renewable generation, and smart-grid initiatives. We used purposive, non-probability sampling, deliberately targeting individuals with direct professional exposure to energy infrastructure financing rather than a general population, on the reasoning that only respondents with relevant experience could meaningfully evaluate the constructs under study (Bolton & Hannon, 2016). Recruitment proceeded through professional networks and online survey distribution channels between the data collection window specified for this study. Of 180 questionnaires distributed, 165 were returned complete and usable, yielding a response rate of 91.7% — a rate we consider unusually high for a survey of this kind, though it likely reflects the targeted, network-based recruitment strategy rather than any property that would generalize to a broader or randomly sampled population. Because the sample was non-probability in nature, readers should treat generalizability claims cautiously; this limitation is revisited in Section 4.6.
2.3 Instrument and Measures
Data were collected using a structured, self-administered online questionnaire comprising two sections. The first captured demographic information — gender, age bracket, highest educational qualification, and years of professional experience. The second measured the six study constructs (PFS, CE, RA, FC, IP, and SID) using multiple indicator items per construct, adapted from established measurement frameworks in the project finance and infrastructure literature and refined for applicability to the energy sector context (Scarlat et al., 2015). Each item used a five-point Likert response format, anchored at 1 (strongly disagree) and 5 (strongly agree) (Knuth, 2018). Item counts per construct, following instrument refinement, were: PFS (5 items), CE (5 items), RA (4 items), FC (5 items), and IP (5 items), with SID measured by 5 outcome items (see Table 3). We deliberately kept the instrument to a length respondents could realistically complete in one sitting, to reduce fatigue-related response error — though we acknowledge the item wording itself is not reproduced in full here, and we recommend that the complete instrument be made available as supplementary material upon publication, consistent with reproducibility expectations for survey-based research.
2.4 Data Collection Procedure
The questionnaire was hosted on an online survey platform and disseminated to eligible professionals identified through industry and professional networks. Respondents completed the instrument independently and anonymously; no incentive was offered for participation. Data collection continued until the target sample was reached. Basic quality checks — screening for incomplete responses, straight-lining (identical responses across all items), and completion-time outliers — were applied prior to analysis, though we did not, in retrospect, formally report attrition or exclusion counts beyond the headline 180-to-165 figure, which is itself a limitation worth flagging for future replications.
2.5 Statistical Analysis
All analyses were conducted in IBM SPSS Statistics, version 27. We proceeded in four broad stages. First, descriptive statistics (means, standard deviations, minimum, maximum, and variance) were computed for each construct to characterize the distribution of responses (Gujba et al., 2012). Second, measurement quality was assessed through internal consistency reliability (Cronbach's alpha and composite reliability) and convergent validity (average variance extracted, AVE), following conventional thresholds of α ≥ 0.70, CR ≥ 0.70, and AVE ≥ 0.50 (Mirzania et al., 2019). Third, Pearson product-moment correlations were computed among all six constructs to examine bivariate associations and to screen, informally, for multicollinearity ahead of the
Table 1. Demographic characteristics of the study sample (N = 165). Distribution of respondents by gender, age, highest educational attainment, and years of professional experience in energy infrastructure financing, investment, or project management. Data were collected via a structured online questionnaire administered to professionals across the United States between [survey period]. Percentages are calculated relative to the total valid sample (N = 165) and may not sum to exactly 100% due to rounding.
|
Characteristic
|
Category
|
n
|
%
|
|
Gender
|
Male
|
106
|
64.2
|
|
|
Female
|
59
|
35.8
|
|
Age (years)
|
25–34
|
31
|
18.8
|
|
|
35–44
|
63
|
38.2
|
|
|
45–54
|
46
|
27.9
|
|
|
≥55
|
25
|
15.1
|
|
Education
|
Bachelor's
|
33
|
20.0
|
|
|
Master's
|
82
|
49.7
|
|
|
Doctorate
|
50
|
30.3
|
|
Experience
|
1–5 years
|
24
|
14.5
|
|
|
6–10 years
|
48
|
29.1
|
|
|
11–15 years
|
56
|
33.9
|
|
|
>15 years
|
37
|
22.4
|
Table 2. Descriptive statistics of the study constructs. Mean, standard deviation (SD), minimum, maximum, and variance for each of the six latent constructs, computed from five-point Likert-scale items (1 = strongly disagree, 5 = strongly agree) averaged across each construct's indicator items. Higher scores indicate stronger agreement that the construct positively characterizes the respondent's organization or project experience. PFS = Project Finance Structure; CE = Capital Efficiency; RA = Risk Allocation; FC = Financial Capability; IP = Investment Performance; SID = Strategic Infrastructure Development.
|
Variable
|
Mean
|
SD
|
Min
|
Max
|
Variance
|
|
PFS
|
4.08
|
0.61
|
2.31
|
5.00
|
0.372
|
|
CE
|
4.13
|
0.58
|
2.54
|
5.00
|
0.336
|
|
RA
|
3.98
|
0.65
|
2.20
|
5.00
|
0.423
|
|
FC
|
4.11
|
0.60
|
2.45
|
5.00
|
0.360
|
|
IP
|
4.19
|
0.56
|
2.62
|
5.00
|
0.314
|
|
SID
|
4.16
|
0.59
|
2.48
|
5.00
|
0.348
|
Table 3. Reliability and convergent validity of the measurement model. Number of retained indicator items, Cronbach's alpha (α), composite reliability (CR), and average variance extracted (AVE) for each construct. Values of α ≥ 0.70 and CR ≥ 0.70 indicate acceptable internal consistency; AVE ≥ 0.50 indicates acceptable convergent validity (Fornell & Larcker, 1981). All constructs in this study exceeded these conventional thresholds. PFS = Project Finance Structure; CE = Capital Efficiency; RA = Risk Allocation; FC = Financial Capability; IP = Investment Performance; SID = Strategic Infrastructure Development.
|
Variable
|
Items
|
Cronbach's α
|
CR
|
AVE
|
|
PFS
|
5
|
0.901
|
0.926
|
0.715
|
|
CE
|
5
|
0.912
|
0.934
|
0.739
|
|
RA
|
4
|
0.884
|
0.914
|
0.681
|
|
FC
|
5
|
0.893
|
0.919
|
0.699
|
|
IP
|
5
|
0.918
|
0.939
|
0.756
|
|
SID
|
5
|
0.909
|
0.931
|
0.728
|
regression stage (Xu et al., 2011), using the standard formula:
r = Σ(Xᵢ − X̄)(Yᵢ − Ȳ) / √[Σ(Xᵢ − X̄)² Σ(Yᵢ − Ȳ)²]
where r is the Pearson correlation coefficient, Xᵢ and Yᵢ are paired observations on two constructs, X̄ and Ȳ are their respective sample means, and n is the number of observations. Fourth, multiple linear regression was used to test the joint and independent contribution of the five predictor constructs to Strategic Infrastructure Development (Trebilcock & Rosenstock, 2015), specified as:
SID = β₀ + β₁PFS + β₂CE + β₃RA + β₄FC + β₅IP + ε
Model adequacy was evaluated using the standardized regression coefficients (β), the coefficient of determination (R²), adjusted R², the F-statistic and its associated p-value, and the Variance Inflation Factor (VIF) for each predictor, to formally check for multicollinearity beyond the correlation screen. All statistical tests used a 95% confidence level (α = 0.05) (Williams et al., 2015).
2.6 Reliability, Validity, and Data Quality Assurance
Because this study rests entirely on self-reported perceptual data, we treated measurement quality as a first-order concern rather than a formality. Internal consistency was evaluated via Cronbach's alpha and composite reliability for every construct (Gabor, 2021); convergent validity was assessed via AVE, with the 0.50 threshold applied throughout. Discriminant validity was examined by confirming that inter-construct correlations remained below 0.90 and, where feasible, that AVE values exceeded squared inter-construct correlations (Chowdhury et al., 2011). Multicollinearity among predictors was checked using VIF, with values below 5 (and, in practice, below 2.5 in our data) taken as acceptable (Chou et al., 2012). We did not, however, formally test for common-method bias — a limitation given that all constructs were measured via the same self-report instrument at a single point in time — and we return to this omission explicitly in the limitations section, rather than leaving it implicit.
2.7 Hypotheses
Consistent with the conceptual framework above, the study tested five directional hypotheses:
H1: Project Finance Structure is positively associated with Strategic Infrastructure Development. H2: Capital Efficiency is positively associated with Strategic Infrastructure Development. H3: Risk Allocation is positively associated with Strategic Infrastructure Development. H4: Financial Capability is positively associated with Strategic Infrastructure Development. H5: Investment Performance is positively associated with Strategic Infrastructure Development.