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What is the Difference Between Total Postings and Unique Postings?

Total Postings

Emsi counts every job posting for your timeframe with no deduplication. In other words, every job posting, even copies of the same posting, are counted toward the Total.

Note: Emsi rarely uses “Total Postings” for analysis. Raw posting volume, with duplicate postings, skews the real story. Unique postings help provide a more accurate picture.

Unique Postings

Emsi’s de-duplicated job postings. Multiple postings that list the same job, same company, and same location (city/state in US) are reduced to 1 unique posting.

Unique Postings and Timeframes

The amount of unique postings will vary depending on your timeframe.

By nature, longer timeframes will include more unique postings but we also ensure we do not double count a single unique post within a given timeframe. The unique postings count for any specific time period is not the summation of shorter time frames but a distinct count of active postings across the entire time frame. So, the total unique posting count for three months of postings will not be the same as adding the three monthly postings. All postings that are active at any time during that period will be included in the count.

Example: Take a 3 month long timeframe (January – March) as shown in yellow above. Unique postings for this 3 month period is 25,000 because postings that appear multiple times are only counted once. Yet, when the time frame is set to 1 month and each of the 3 months are reviewed separately (as for the graph above), those same postings are counted once for each month they appear in and the results are 17,000 (Jan.), 14,500 (Feb.), and 13,000 (March).  The diagram below shows this calculation graphically. Avoid adding postings from individual months together to get the unique postings over a series of months. Instead, set your timeframe to start-month postings through end-month postings.

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Let us know what specific questions we can help you with (we may even add your question to our knowledge base).