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andrewgelman.com

https://andrewgelman.com· First analyzed 13 May 2026· Updated 13 May 2026
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andrewgelman.com
Desktop screenshot of andrewgelman.com
Mobile screenshot of andrewgelman.com
Mobile

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Hosting Provider

Google Cloud Platform
cloud.google.com

IP Address

35.232.19.148

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Council Bluffs, United States

ASN

AS396982

Organization

Google Cloud (us-central1)

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns4.worldnic.com.ns3.worldnic.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
343 ms10%
Speed Index
446 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
53 KB
18 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPress
cms
twentyeleven

Technology Stack

7 Technologies Detected

Analytics

2
Google Analytics
Segment

Plugins

2
Twenty Eleven Theme ExtensionsWp Quicklatex

Libraries

1
jQueryv3.7.1

CSS Frameworks

1
Tailwind CSS

CDN

1
Cloudflare

SEO Analysis

D59/100
16
11
2
Meta Tags10/15
Content12/12
Headings3/8
Technical13/25
E-E-A-T3/7
Images3/7
Links2/5
URL5/5
Social0/5
Freshness2/4
Mobile3/4
Indexability3/3
A
andrewgelman.comandrewgelman.com

Statistical Modeling, Causal Inference, and Social Science

No description available for this page.

Title Length58 chars

Recommended: 50-60 chars (~336px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Most images missing alt text (10/10) — critical for accessibility and SEO

13 issues found

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Crawlability

Sitemap
robots.txt

4 rules

Local SEO

Local Search Readiness

3/100
Poor
1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

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AI & LLM Readiness

F38/100
Bot Access
20/25
Machine Read.
10/25
Schema Data
0/25
Citation
8/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
blockquotesnavheader/footer
Text ratio:45%
Words:14,971
Token eff.:Excessive
Sections/1K:0.2
Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary12w
Descriptive Headingsavg 2w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (8)
AI readiness recommendation preview...
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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
A
86/100
13
Passed
2
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
18/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
15/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
3/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
87/100
A+
5 mg
CO₂e / view
52.7 KB
Page Weight
95%
Cleaner Than
New Visitor
6 mg
vs
Returning (cached)
3 mg
Annual (10K/mo)
636 g
Emission Segments
Data Center
<0.001 g
Network
2 mg
Device
4 mg
Resource Breakdown
HTML
52.7 KB
Green Hosting Verified
Google Cloud Platform
Provider Match
1 recommendation
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
D

Security Score

41%Poor
Interactive

HTTPS

WAF

88d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

12.05.2026

Valid Until

10.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

columbia.edu*.italianacademy.columbia.edu*.columbia.edu*.hr.columbia.edu*.rascal.columbia.edu*.universityseminars.columbia.edu*.senate.columbia.edu*.art.columbia.edu+12 more

SHA-256 Fingerprint

83:F5:1B:BF:90:31:99:61:EB:02:1C:1E:C6:11:22:14:02:49:4A:20...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🟡 0s(max-age=0, must-revalidate, private)
cf-cache-status
DYNAMIC
cf-ray🇺🇸 Washington DC
9fb4c3e358cff933-IAD
content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=UTF-8
date
Wed, 13 May 2026 21:30:35 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

0

SPF
DKIM
DMARC

Domain Information

andrewgelman.com

Domain Age
21y 1m

Created

09.04.2005

Expires

09.04.2029

Last Updated

09.02.2024

Registrar

Network Solutions, LLC

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Data Protection Officer mentioned

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
C
66/100
Mobile Friendly1 breakpoint
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
Viewport
width=device-width

Typography & Readability

Helvetica Neue + Georgia

WCAG Partial
77/100
Readability
/30
26/30

16px · LH 1.60

Hierarchy
/20
14/20

1.5x ratio

WCAG
/25
15/25

1.6:1 min contrast

Performance
/25
22/25

System fonts

Heading Font

Helvetica Neue

Sans24px

Body Font

Georgia

Serif16px

Contrast Ratio

1.6:1

6 issues

Reading Comfort

~42 CPL

Narrow lines
24px
h1
14px
h2
15px
h3
16px
p

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio (ideal range 1.4–1.6).

⚠️ Hard to read: Flesch score 46/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 6 elements below WCAG AA threshold (min 1.6:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

Fluid Type (rem)Flesch 46

Color Palette

6 unique colors
2.85:1 Fail Light
#ffffff
Background· 73.1%
#98999a
Other· 1.7%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

9 Resources

4
Scripts
5
Styles
1
Async
0
Defer

Top Script Sources

statmodeling.stat.columbia.edu(3)google-analytics.com(1)

Website Identity

andrewgelman.com

21 years old
Location detected: 🇺🇸 United Statesvia ip
Network Solutions, LLCen-US

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Last analyzed: 13 May 2026 at 21:31

Historical Analysis & Change Tracking