RDD Phone

“RDD is a highly cost effective method of obtaining representative sample data on a broad scale”

Unbiased sample – all over the world

“More experience of dual frame RDD than any other sample provider”

Many research projects require telephone samples to be unbiased. The best way to gain unbiased samples is by using randomly generated telephone numbers (RDD). At Sample Answers, we have a comprehensive range of RDD products covering almost every country in the world including:

  • landline RDD
  • mobile RDD
  • dual frame RDD

Easy access. Truly representative

RDD is a highly cost-effective method of obtaining representative sample data on a broad scale. Available using both landline and mobile contacts, we use RDD to generate numbers based on area, country or network provider. This method provides easy access to areas where targeted sampling is difficult and makes for a truly representative sample of the broad demographic you want to target.

Landline RDD

RDD does not simply involve dialling random numbers as the name implies.

We obtain the contacts via two methods:

  • Pure RDD – we build blocks of numbers based on information from regulatory bodies
  • Representative RDD – we build sample frames based on information that we glean from directories, gazetteers and other sources

Mobile RDD

As mobile phones continue an ever-expanding penetration of communications, it’s increasingly important to ensure that mobile phone contacts are integrated into your standard consumer research. We use mobile phone communications to target less accessible sample groups, including younger populations and households, which no longer have landlines.

RDD – unverified or verified

Verified RDD is available in many countries and involves testing the sample by verifying which numbers are currently active. This method isn’t 100% effective, but significantly improves the productivity of the sample.

“We’ve provided international landline RDD for almost 20 years”

Mobile RDD is useful in countries where landline penetration is low

Because mobile phone numbers are generated by network, not region, it’s only possible to define mobile RDD targeting geographically by country. However, in some countries e.g. Mexico and Brazil, we can target specific areas or regions.

RDD. We make it fresh

“Every Sample Answers’ RDD is freshly produced to order”

You can expect next day delivery of a single country order. We’ll need a few days lead-time for delivery of multi-country studies, particularly where verification is required.

Worldwide coverage

Some of the countries that we’ve produced RDD sample for:

Argentina, Australia, Bahamas, Barbados, Belgium, Brazil, Canada, Chile, China, Costa Rica, Denmark, Dominican Republic, El Salvador, France, Germany, Greece, Hungary, India, Indonesia, Italy, Jamaica, Japan, Malaysia, Mexico, Netherlands, Panama, Paraguay, Peru, Poland, Portugal, Puerto Rico, Republic of Ireland, Russia, Singapore, Slovakia, South Africa, South Korea, Spain, Sweden, Switzerland, Taiwan, Trinidad and Tobago, Turkey, UK and USA.

For most countries, we can append the following location identifiers to Landline RDD

  • Nielsen DMA
  • National Regions, Town / City
  • ZIP / Post Code (full or partial)

Note: We provide US mobile RDD solely for manual dialling. The practice of using auto diallers to call mobiles is prohibited by the TCPA.

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