Numerical Data Interpretation Test
Overview: Measures the ability to analyze and interpret numerical information in reports, charts, and graphs.
Administration: Online/computer, Paper-and-pencil
Completion Time: 30 minutes
Measure numerical reasoning because data is useless without the skills to analyze it.
Numerical reasoning is one of the most important skills in today's data-driven workplace. The NDIT goes beyond a candidate's typical math skills to identify their ability to manipulate and interpret numerical information from reports, charts, tables, or dashboards. The US Department of Labor's O*NET database rates these skills as "important" for nearly 300 jobs ranging from sales managers to executives. In today's data-driven economy, numerical reasoning isn't just for the finance department anymore.
Designed in consultation with recruiters and human resource professionals, NDIT meets psychometric standards for reliability and validity. NDIT items are face valid or work relevant which improves the testing experience. Because real world math is not multiple choice, the free response items on NDIT require test takers to calculate their response, unlike with a multiple choice item.
Content & Administration
- Measures the ability to analyze and interpret numerical information in reports, charts, and graphs
- Administered with a 30-minute time limit
- Suitable for proctored or unproctored testing
- Available in US, UK, Indian, and Australian English
- Available for online or paper-and-pencil administration
- Contains 21 items drawn from a bank of over 100 items
- Norms include working adults, professionals/individual contributors, and global financial roles
Learn more about combining NDIT with other TalentLens Solutions in our latest Research Brief.
For Frequently Asked Questions, please look below or download this PDF.
What does the Numerical Data Interpretation Test measure?
NDIT™ assesses numerical reasoning ability related to the interpretation and manipulation of the types of numerical data routinely encountered in the workplace. Specifically, NDIT measures the ability to
- correctly analyze and interpret numerical information presented in surveys, reports, charts, graphs, and dashboards;
- draw logical conclusions and correct inferences from numerical data;
- calculate values using basic arithmetic operators;
- work with percentages; and
- identify when additional data is required to draw conclusions.
What are the unique features of the Numerical Data Interpretation Test?
- NDIT is an item-banked test with over 100 items, so candidates rarely receive the same test. This allows for unproctored testing and improved test security.
- NDIT features both multiple choice and free response items. Free response items make guessing the correct answer highly unlikely, which improves the accuracy of the assessment.
- NDIT items are highly relevant to the real numerical problems encountered at work, which improves applicants’ testing experience and fairness impressions.
What norms are available for NDIT?
- Professionals/Individual Contributors
- Working Adults in the U.S.
- Working Adults in the UK
- Working Adults in India
- Financial Roles (Global)
- A custom norm group for your organization can be developed by TalentLens Research Services. Contact us for details.
For what jobs is NDIT appropriate?
Numerical reasoning is an important skill for many work settings including executive, managerial, supervisory, professional, sales, administrative, and technical roles across most industry sectors. A job analysis will identify what job duties require numerical reasoning. NDIT is appropriate for jobs where data interpretation is used frequently or on critical job tasks.
How do item-banked tests differ from fixed test forms?
The content for item-banked tests undergoes the same rigorous development and review process as items for a fixed test form. While a fixed test form only has a set number of items equal to the total test length (21 items), the item-banked version has over 100 unique items. Item-banked tests also have more sophisticated item delivery rules to ensure consistency among test administrations such as total word count, variation in the item stimulus (e.g., bar graphs, data tables), and data technique (e.g., costs, revenue, percentages, and ratios). Both item-banked tests and fixed tests ultimately express candidate scores as a percentile rank.
NDIT™ and other TalentLens Solutions
How is a numerical reasoning test different than a math test?
Mathematical ability reflects the ability to learn, retain, and apply mathematical formulas which are computational skills. Numerical reasoning uses analytical skills which require the ability to deduce, interpret, and evaluate numerical data. It is possible for an individual to obtain different score levels in a math test versus an assessment of numerical reasoning ability. In fact, the NDIT and DAT: Numerical Calculation Test (Pearson, in press) had a moderate correlation of .55 in a sample of 104 working adults.
How does NDIT compare with other numerical tests by TalentLens?
Differential Aptitude Test: Numerical Ability (DAT; Pearson, 2008) measures understanding of numerical relationships and facility in handling numerical operations. The test focuses on computation rather than reasoning. Numerical ability scores are used to predict success in positions that require the abilityto accurately compute and calculate numbers. DAT Numerical Ability is a math test intended for entry-level positions and NDIT is a numerical reasoning test suited for positions in which numerical data interpretation is important.
DAT: Numerical Sequence (Pearson, in press) measures pattern recognition in numbers using computer adaptive testing. The Numerical Sequence test will be available for purchase in the U.S. in 2017. NDIT and Numerical Sequence are moderately correlated (r=.39, n=104 working adults).
Advanced Numerical Reasoning Assessment (ANRA; Rust, 2007) measures numerical reasoning by assessing the ability to compare quantities and recognize the sufficiency of numerical information to make decisions. ANRA has been described as a test of ‘critical thinking ability with numbers’. ANRA has a high correlation with the Watson-Glaser Critical Thinking Appraisal® (.68) while NDIT has a moderate correlation with critical thinking (.47). NDIT expands on ANRA and offers more work-relevant items in an item-banked format allowing for unproctored testing. The two numerical reasoning tests show a high correlation (r=.64).
NDIT Scoring and Reporting
How are candidate scores reported for NDIT?
Scores are presented on the candidate’s profile report in the form of a percentile rank and other commonly used standardized scores. The candidate score is displayed as a midpoint percentile rank where the average score is at the 50th percentile. Figure 5 shows a candidate who scored at or above 65% of the individuals in the normative group on the NDIT.
Candidate raw score, ability score, and percentile rank are available in the administrator’s status/score report dashboard. Administrators may show or hide scores according to their preference by selecting the link under the search field as shown in Figure 6.
What scores are available on candidate profile reports?
Number Correct, T-score, STANINE score, and STEN score are all reported in the Additional Technical Information section of the candidate’s profile report as shown in Figure 7. Item-banked tests produce a theta score (ability score) that takes into account the difficulty level of each item, therefore number of correct responses (raw score) should not be used to make hiring decisions. Rather, use the percentile rank or a standardized score because these scores take into account the item-difficulty differences of the administrations. As shown in Figure 6, Candidate B and Candidate C both achieved a raw score of 16, but had different percentile ranks.
What is the purpose of the different scores on the profile report?
Standardized scores (T-scores, STANINE, and STEN scores) are useful for comparing scores from a new test version to the previous version. Standardized scores also can be combined, such as NDIT results with other TalentLens' ability test results, to obtain a more complete profile. From a practical perspective, standardized scores meet multinational companies’ requirements, which vary according to local law and preference. However, all TalentLens profile reports also include a candidate percentile rank score. You can continue to use this score to make comparisons in the process of making hiring decisions.
What is the difference between NDIT and the ATHENA Numerical Reasoning Test?
NDIT™ is the new global product name for ATHENA (UK only). There is no difference in test content between ATHENA and NDIT. ATHENA inventory may still be used and results from both tests are equivalent.
Is a paper form of NDIT available?
Yes. Contact your customer support office for details. The contact number of your local TalentLens office can be found on the website www.Talentlens.com.
What are the differences among all of the English language versions?
NDIT is currently available in U.S. English and UK English with minor adaptations to the candidate demographics and the profile report for the Indian English and Australian English versions. The primary differences in the global assessment content are in the usage of dollars or pounds on currency based items, kilometers or miles on distance based questions, and other localization of words like truck (U.S. English) or lorry (UK English). To appropriately benchmark your job candidates with a comparable norm group, use the language version developed for your geographic region.