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Methodnex

Surveys & Psychometrics

Instruments with evidence for their reliability and validity in your population.

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Questions we help answer

A survey is only as good as its questions and its sample. We help you write and test items, validate scales, including Arabic adaptations, and plan fieldwork so that the data are fit for analysis.

  • How do I know my questionnaire measures the construct I care about?
  • I translated a scale into Arabic. What do I need to show before using it?
  • Is Cronbach's alpha enough to report reliability?
  • How should I weight the sample and report survey quality?

Scope of service

What you receive

  • Questionnaire design, item review and pilot testing
  • Guidance on cognitive interviewing
  • Reliability analysis, EFA and CFA, and evidence of construct validity
  • Measurement invariance testing and scale adaptation
  • Sampling and weighting advice, and a survey quality review
  • Designs for market, employee and customer studies, impact assessments and M&E frameworks

What is not included

  • We do not fill in or simulate survey responses.
  • We do not drop items only to raise a reliability coefficient.
  • We do not run fieldwork unless it is agreed in the scope.

Methods and tools, and when we use them

  • Exploratory and confirmatory factor analysis

    When you need evidence for the structure of a scale.

  • Reliability coefficients: alpha and omega

    When reporting internal consistency. Omega is often the better choice for multidimensional scales.

  • Measurement invariance

    When scores are compared across groups, languages or time points.

  • Translation and cultural adaptation

    When an instrument developed elsewhere is used in a new language or setting.

How the work runs

  1. 1

    Intake

    You describe the project through the request form or a call. No data are needed at this stage.

  2. 2

    Methodological scoping

    We review the design and agree the deliverables, exclusions, timeline and fee in writing.

  3. 3

    Execution

    The assigned consultant does the work and records methods, assumptions and changes.

  4. 4

    Quality assurance

    A second specialist reviews the methods and outputs before release.

  5. 5

    Handover

    You receive the deliverables, the code and a walkthrough session, with the agreed revision rounds.

Who this is for

  • Researchers building or adapting scales
  • HR and customer-insight teams
  • NGOs and donors measuring programme results
  • Public bodies running population surveys

Questions about this service

Can you validate an Arabic version of an existing scale?

Yes. We advise on translation and back-translation, pilot testing, and the factor-analytic and invariance evidence that reviewers expect. Permission from the owner of the scale remains your responsibility.

Do you collect the data?

Our standard service covers design, guidance and analysis. Fieldwork support can be added to the scope of institutional projects.

What sample size do I need for factor analysis?

It depends on the number of items, the expected loadings and the model. We estimate it during scoping instead of applying one rule of thumb.

Can you review a survey that has already been run?

Yes. We assess what the data can and cannot support, and we say so in writing.

Other services

Request a scoped quotation

Describe the project in a few minutes. Complex research is quoted after scoping, never from a price list.

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