RDD Sampling

RDD Sampling

Pure Probability Based Samples for Landline and Wireless Phones

Scientific Telephone Samples (STS) offers a comprehensive array of random digit dialing (RDD) sampling options to fulfill any marketing research project. Each RDD sample is scientifically constructed to yield a highly representative sample of the population under study. RDD sampling is the most recommended sampling frame when representation is of key importance. This statistical accuracy is achieved primarily due to the fact all telephone households, including both listed and unlisted phones, are included in the sampling frame for RDD Landline and RDD Wireless samples.

Unlike listed samples, which are targeted toward specific demographic segments of the population (such as age, income, or presence of children) RDD samples are more general in scope and provide a lower degree of sampling error.

STS offers both RDD Wireless and RDD Landline samples, and since 57.1% of US households are without a landline, it is very important to make a significant proportion of your sample wireless. The following chart shows the distribution of telephone households across the country:

At STS, we have sophisticated techniques for targeting RDD samples to geographic areas and create “hybrid samples” using a blend of our other targeted sampling frames. RDD samples can also be cleaned to remove non-productive numbers. In fact, business purging is free on every RDD order.

Please contact an STS Account Representative to discuss all the available options and how RDD sampling can help your research become more representative.

RDD House
  • Pure probability based sample
  • Modified designs available
  • Free business purging included
  • All telephone households included
  • Customizable sampling options
  • Most statistically representative
  • Fast Turnaround

30 years of quality RDD Sampling

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STS offers all traditional sampling methodologies and allows you to completely customize your sample. Contact an STS Account Representative to discuss the variety of RDD sampling methodologies that we offer at info@stssamples.com or
1 (800)944-4-STS.



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RDD Sampling Methodology Options

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Constructing random digit samples that are accurate and representative is a science, and must be constructed using the proper methodology. STS has over 30 years of experience constructing and optimizing RDD samples and RDD databases. Considering our proven track record of success, you can rest assured that STS samples are superb.



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STS PreID-Attended™ Screening

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Supercharge your RDD samples with PreID-Attended™ screening. Using live interviewers to screen your sample eliminates disconnected numbers, saving time and enhancing productivity. Disposition codes are also included which allow you to see the results for each phone number. Contact an STS Account Representative to discuss how PreID-Attended™ screening can help you stay more productive at info@stssamples.com or (800)944-4-STS.



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STS Activity-PreID™ Coding

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Gain the power of productivity by coding how recently each phone number has been actually used by the subscriber. Using Activity-PreID™, each phone number is coded to show recent activity. Thus, you can choose to call only those phone numbers that are more active and likely to be a live number. Contact an STS Account Representative for more details at info@stssamples.com or 1(800)944-4-STS.



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Billing ZIP Code Append

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Output the actual Billing ZIP code of the phone subscriber based on live authoritative telephone company database lookups. Using the Billing ZIP code you can gain important insight into where your respondents/intended contacts are actually located. Contact an STS Account Representative for more details at info@stssamples.com or 1(800)944-4-STS.



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Specialized Targeting

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STS offers proprietary procedures for dealing with smaller, often more difficult to target geographic areas, such as ZIP codes, that make “exchange coverage analysis” reports obsolete and targeting small areas simple.



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