True RDD Sample for National Representative Data

Our RDD sample is the backbone of global telephone surveys, opinion polling and social research. The industry Gold Standard RDD Sample is used by over 350 Think Tanks, government agencies, fieldwork agencies and corporate clients.

RDD Portfolio

Going beyond random sampling

Our random sampling is backed by a transparent methodology and enhanced filtering for fieldwork efficiency.

Mobile RDD Sample

Expand your reach with an updated mobile RDD sample including provider information with wide coverage in over 140 countries.

Dual-Frame RDD sample

The mixed Dual-Frame approach mode combines both landline and mobile and is designed to reduce bias data, increase the response rate and reach a larger audience. In some countries older respondents or females can be reached easier this way.

Landline RDD Sample

Sample Solutions provides a fully geo-coded landline RDD sample with removed business listings to the market research industry.

150

RDD records delivered

190

Countries Covered

350

RDD Projects annually

Full Coverage

Coverage

Our RDD sample connects seven billion individuals with your research.

Telephone Data Collection has been around for decades and has proven itself as vital tool for national representative surveys, data collection tool for developing countries and in extreme situation such as pandemics or areas of conflict.

Sample Solutions for methodological sampling

The sample provided comes with full country information such as frame coverage, potential bias or mobile & landline access data.

Fast Turnaround Time

90% of our RDD orders are delivered within 24 hours.

Open Methodology

No blackbox – the sample is fully documented.

Full Sampling Info

Frame sizes, coverage data, population data is available.

190+ Countries covered

Only a handful of countries exist that we have not covered.

Close to full coverage

Most countries have close to full phone coverage.

Full Probability

We do not work with lists – it is true probability sampling.

Testimonials

Sample some of our Testimonials

Global Resources, SSRS

Sample Solutions is my first call when I need a global sample. Carsten and his team are very responsive and always provide meaningful insights and recommendations relevant to dialing in each country. From simple population estimates to complex multi-country RDD sample plans, SSE always delivers on time for all of my key accounts.

D3 Systems, Inc.

The Sample Solutions team has always been prompt and responsive and has worked with us over the years to make our research in many difficult to survey environments across the world even better. Carsten and his team are always willing to work through the unique challenges of our projects with us, providing a high quality yet cooperatively developed product.

Verian

Sample Solutions has a great variety of services to be offered. One of a kind team of professionals that works around the clock to service their Clients. Exceptional, trustworthy and reliable. Glad to be partnering with them for all kinds of projects.

DT&P international

Every week we use thousands of B2C RDD landlines and mobiles and the quality has been excellent. For our National and International B2B surveys we work together solely with Sample Solution. We have received quick support and there has always been sufficient sample.

Past Projects

Sampling coverage when other modes fail.

Some of our previous projects included surveys in Crimea, Greenland, data collection in Syria as well as Afghanistan. We can sample when other data collection modes are close to impossible.

ESRA Presentation

Big Data Matching

Using Big Data applications to Decrease The Coverage Error and Sample Bias in European Establishment Surveys

AAPOR Poster

IVR Phone Surveys

Screened mobile sample for IVR surveys in developing countries 2020 Paper – The case of Sri Lanka and Ecuador

WAPOR Presentation

From CAPI to CATI

By looking at Greece and comparing a Face-2-Face and CATI study using our RDD Dual-Frame RDD Sample

Recognized by global standards

A yearly re-certification for ISO 27001, ISO 20252 in combination with a dedicated policy document, sampling methodologies and quality structure ensures enterprise level sampling quality.

RDD Sample Process

Our RDD Sample Generation

Over the years, we built a comprehensive RDD frame to fit various needs for conducting international projects and we have worked hard to earn a trusted network of customers all based on a solid methodology.

Sampling Frame

The sampling frame consists of every single possible number combination.

Raw RDD Generation

The raw RDD sample is created based on clients’ specifications (NatRep or customized)

Number Processing

All numbers are screened and the disconnected numbers are removed from the sample.

Post-Processing

Post-processing involves adding necessary strata inspection and quality checks.

Frequently Asked Questions

Got any questions? We’re here to help

A respondent asked me where the data came from?

As data controller you can provide them with a link to our data subject request and we can pick it up from there.

Which countries do you cover?

Our database is global in terms of coverage. However through Western Europe and North America we have the best in-country coverage and depth of data.

Do named contacts come with the company data?

We generally have the owner or Managing Director as contact. If needed we can add other direct contact people that are relevant for your research.

How long is the delivery time?

Turnaround time is usually 2-3 working days.

I have a file but miss some data points - can you help?

No problem, take a glance at our data enrichment options which can help you to enrich missing data points.

RDD Sample

B2B Sample

B2C Consumer Sample

Automotive Sample

Ethnic Sampling

Probability Panel - Lifepanel

B2B Digital Recruitment