Some findings from a study on content freshness and Google ranking performance.
Dataset: 14,987 URLs across 20 content verticals. Method: Compared 6,819 updated pages against 8,168 never updated pages. Measured ranking changes over a 76 day window using historical SERP data. Statistical test: Welch's t test.
Finding 1: Content decays fast
Pages that were never updated lost 2.51 positions on average over 76 days. Updated pages lost only 0.32. That's 87% less decay (though this finding is directional at p=0.09).
Finding 2: Update magnitude determines outcome
| Content change | n | Avg position change |
|---|---|---|
| 0 to 10% | part of 6,819 | 0.51 |
| 11 to 30% | part of 6,819 | 2.18 |
| 31 to 100% | part of 6,819 | +5.45 |
| Never updated | 8,168 | 2.51 |
Only the 31 to 100% expansion group showed improvement. This result is statistically significant (p=0.026). Net difference vs control: +7.96 positions.
Finding 3: Industry variation is dramatic
| Vertical | Sample | % improved | Avg position change |
|---|---|---|---|
| Technology | 1,008 | 66.7% | +9.00 |
| Gardening | 768 | 63.2% | +3.11 |
| Education | 704 | 60.0% | +1.70 |
| Parenting | 603 | 60.0% | +1.78 |
| Career | 727 | 50.0% | +3.39 |
| Home/DIY | 1,050 | 50.0% | +1.12 |
| Travel | 646 | 50.0% | +1.69 |
| Beauty | 1,010 | 48.0% | +3.84 |
| Food | 982 | 45.8% | 1.59 |
| Pets | 444 | 45.5% | 6.55 |
| Automotive | 664 | 44.4% | 4.11 |
| Small Business | 727 | 44.4% | 2.33 |
| Fitness | 809 | 44.0% | 4.56 |
| Health | 566 | 42.9% | +4.79 |
| Mental Health | 808 | 40.0% | 7.95 |
| Legal | 553 | 40.0% | +0.40 |
| Finance | 970 | 37.5% | 0.87 |
| Relationships | 889 | 33.3% | 1.52 |
| Real Estate | 525 | 30.8% | 2.08 |
| Hobbies | 534 | 14.3% | 9.14 |
Limitations: Observational study with control group, not RCT. Confounders include backlinks, competitor activity, and algorithm changes. All URLs were already in the top 100. Content dates from page metadata.
Source and methodology: https://republishai.com/content-optimization/content-refresh/
by domid