---
title: "#validity articles | Hashnode"
description: "Explore 2 articles tagged #validity on Hashnode. Tutorials, guides, and how-tos from the community."
url: "https://hashnode.com/tag/validity"
---

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# #validity

2 posts · 0 followers

[nine](https://hashnode.com/@xdsai) · [Apr 22](https://hashnode.com/posts/tls-certificate-expiry-detection-renewal-and-the-47-day-future/69e89f3def15c4dece794650)

### [TLS Certificate Expiry: Detection, Renewal, and the 47-Day Future](https://certpulse.hashnode.dev/tls-certificate-expiry-detection-renewal-and-the-47-day-future?utm_source=hashnode&utm_medium=feed)

TLS certificate expiry explained for engineers: how to detect it, automate renewal, and prepare for the 47-day validity era arriving by March 2029.

12 min read · [certpulse.hashnode.dev](https://certpulse.hashnode.dev/tls-certificate-expiry-detection-renewal-and-the-47-day-future?utm_source=hashnode&utm_medium=feed)

[Stat Hacks](https://hashnode.com/@stathacks) · [Dec 20, 2025](https://hashnode.com/posts/hp3804-ntu-psychology-statistics-module-review-validity-of-a-scale-5c135b9ca2db/69461265932de80538a56d3e)

### [HP3804 NTU Psychology Statistics: Module Review (Validity of a Scale)](https://ntu-psychology-statistics.hashnode.dev/hp3804-ntu-psychology-statistics-module-review-validity-of-a-scale-5c135b9ca2db?utm_source=hashnode&utm_medium=feed)

Note: this post is part of a series of posts regarding HP3804 (Psychological Testing) With Reliability covered — we can now move on to Validity (also known as accuracy). I’m sure you have seen this picture before illustrating the difference between R...

7 min read · [ntu-psychology-statistics.hashnode.dev](https://ntu-psychology-statistics.hashnode.dev/hp3804-ntu-psychology-statistics-module-review-validity-of-a-scale-5c135b9ca2db?utm_source=hashnode&utm_medium=feed)