Personal site for hiring and personal branding.https://nimahejazi.me/https://nimahejazi.me/blog/building-toolmaking-net/https://nimahejazi.me/blog/building-toolmaking-net/Why I launched toolmaking.net, a single home for the free, open source utilities I build, starting with ask and a video compressor.Wed, 12 Aug 2026 00:00:00 GMThttps://nimahejazi.me/blog/is-vibe-coding-enough/https://nimahejazi.me/blog/is-vibe-coding-enough/Vibe coding is a fantastic way to prototype and play, but keeping software alive long term takes real engineering discipline. Here is how I think about using AI without letting it rot your codebase.Wed, 15 Jul 2026 00:00:00 GMThttps://nimahejazi.me/blog/building-ask/https://nimahejazi.me/blog/building-ask/Why I built ask, a Python CLI with interactive chat, command extraction, tool support, and local or cloud providers.Mon, 13 Jul 2026 00:00:00 GMThttps://nimahejazi.me/blog/building-nimahejazi-me/https://nimahejazi.me/blog/building-nimahejazi-me/How I built this site with Astro 5, MDX + Zod content collections, CSS-first Tailwind v4, and KaTeX math, and why I chose each piece.Sun, 12 Jul 2026 00:00:00 GMThttps://nimahejazi.me/blog/is-your-ad-really-working-a-statistical-approach-to-measuring-performance/https://nimahejazi.me/blog/is-your-ad-really-working-a-statistical-approach-to-measuring-performance/Clicks alone don't prove an ad works. A statistical approach: multi-touch attribution, A/B testing, and the cost-profit-ROI math behind ad performance.Sat, 04 Oct 2025 00:00:00 GMThttps://nimahejazi.me/blog/from-sample-to-population-a-quick-guide-to-confidence-intervals-with-r/https://nimahejazi.me/blog/from-sample-to-population-a-quick-guide-to-confidence-intervals-with-r/How to estimate a population mean from a sample and build a confidence interval in R, step by step and with the built-in t.test function.Wed, 24 Sep 2025 00:00:00 GMThttps://nimahejazi.me/blog/alpha-beta-and-the-cost-of-wrong-decisions-in-business-analytics/https://nimahejazi.me/blog/alpha-beta-and-the-cost-of-wrong-decisions-in-business-analytics/Every business decision is a bet under uncertainty. A look at Type I and Type II errors, the role of significance level, and what statistical power really costs.Sat, 06 Sep 2025 00:00:00 GMThttps://nimahejazi.me/blog/understanding-standard-error-and-how-it-differs-from-standard-deviation/https://nimahejazi.me/blog/understanding-standard-error-and-how-it-differs-from-standard-deviation/Standard deviation measures spread in your data; standard error measures how much a sample statistic would vary. A plain-English distinction with examples.Sun, 31 Aug 2025 00:00:00 GMThttps://nimahejazi.me/blog/sample-distribution-and-sampling-distribution-are-they-the-same/https://nimahejazi.me/blog/sample-distribution-and-sampling-distribution-are-they-the-same/Sample distribution and sampling distribution sound alike but describe different things. One is the spread of your data; the other is the spread of a statistic across samples.Tue, 26 Aug 2025 00:00:00 GMThttps://nimahejazi.me/blog/why-probability-is-about-theoretical-outcomes-not-guarantees/https://nimahejazi.me/blog/why-probability-is-about-theoretical-outcomes-not-guarantees/A binomial distribution predicts what should happen over infinite repetitions, not what will happen in your next few trials. A coin-flipping experiment shows why.Wed, 20 Aug 2025 00:00:00 GMThttps://nimahejazi.me/blog/permutations-and-combinations-in-everyday-life/https://nimahejazi.me/blog/permutations-and-combinations-in-everyday-life/A plain-English tour of permutations and combinations, and how counting with and without order shows up in locks, outfits, and words.Fri, 15 Aug 2025 00:00:00 GMThttps://nimahejazi.me/blog/building-propertyspot/https://nimahejazi.me/blog/building-propertyspot/How I built PropertySpot on Laravel 8.x and MySQL, containerized with Docker, shipped through a Jenkins pipeline, with role-based auth, Stripe payments, and email verification.Thu, 15 Jun 2023 00:00:00 GMT