ASA Statement on Value-Added Models

Social Performance through Value Added Statement

In a developing economy the real profitability of an industry needs to be assessed neither on the basis of its increasing rate of return nor on investment in relative terms. In recent decades another or additional approach has been used for measuring the success of an organisation i.e. “Value added statement” (VAS). The value added statement can be defined as a statement of the value created by...

The Added Value of Multidimensional IRT Models

Evaluating Value-Added Models for Teacher Accountability

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The Added Value of Value Added Tax

Raising domestic tax revenues is a priority for most sub-Saharan African countries. But the tax bases in most African countries are undermined by widespread tax avoidance and evasion. A new study from CMI supports the claim that improved knowledge about the tax system makes a difference in people’s willingness to pay tax. The study shows that exposure to Value-AddedTax (VAT) makes people take a...

Value-Added Models and the Measurement of Teacher Productivity

Research on teacher productivity, and recently developed accountability systems for teachers, rely on value-added models to estimate the impact of teachers on student performance. The authors test many of the central assumptions required to derive value-added models from an underlying structural cumulative achievement model and reject nearly all of them. Moreover, they find that teacher value a...