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sci.Cronbach-alpha-reliability Calculator
Calculates Cronbach's alpha reliability coefficient from inter-item covariance matrix or correlation, estimating internal consistency of a multi-item scale. α > 0.7 is generally considered acceptable for research; α > 0.9 may indicate redundant items — alpha increases artificially with more items even if correlations are low.
Inputs
K Items
Count of items or occurrences.
Var Item Avg
The square of standard deviation. Less intuitive than SD (units are squared), but used in many statistical formulas.
Var Total
The square of standard deviation. Less intuitive than SD (units are squared), but used in many statistical formulas.
Results
Cronbach alpha α
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
standard error of measurement SEM
The difference between the computed result and the exact or true value — a measure of approximation accuracy.
α = k/(k−1) · (1 − Σs²_i / s²_total)
The combined total across all inputs and components.
reliability interpretation
Qualitative summary of what the computed numbers mean in practical terms.
items needed to reach α=0.8 (Spearman-Brown)
Sample size or count used in the calculation.
SEM interpretation
Qualitative summary of what the computed numbers mean in practical terms.