Epidemiology & Technology

Blog Archive

Benchmarking my Desktop – Updated

I just ran the USERBENCHMARK on my system. Here are the results https://www.userbenchmark.com/UserRun/17714549 UserBenchmarks: Game 20%, Desk 67%, Work 64% ModelBenchCPUIntel Core i7-870097.6%GPUIntel UHD Graphics 630 (Desktop Coffee Lake i5 i7)10.3%SSDSamsung 960 Evo NVMe PCIe M.2 250GB186.5%HDDToshiba HDWN180 8TB72%RAMG.SKILL F4 DDR4 3200 C16 2x16GB99.3%MBDAsus ROG STRIX Z370-G GAMING What did

Survival Analysis in Stata

Cheat-sheet DETAILS A Key concept in survival analysis is ANALYSIS TIME. All analyses are performed in terms of time since becoming at risk, called analysis time. Subjects are exposed at t = time = 0 and later fail. Observations with t = time <= 0 are ignored because information before

Global Estimates of Blindness and Visual Impairments

Data from various global estiamates are summarized here for easy reference: Link to my personal google sheet: https://docs.google.com/spreadsheets/d/1iTgBmRA4VwWE1fzRKA1YD1fzzMvn90Vu/edit?usp=sharing&ouid=113111648583609130450&rtpof=true&sd=true Pascolini, 2010 NUMBERS (millions)WorldIndiaPopulation6737.901181.40Visual Impairment ( PVA < 6\18)285.3962.62Blindness (PVA < 3\60)39.378.08Low Vision (< 6\18-3\60)246.0254.54PREVALENCE (1000 per million population)WorldIndiaVisual Impairment ( PVA < 6\18)42.3653.00Blindness (PVA < 3\60)5.846.84Low Vision (< 6\18-3\60)36.5146.17 20102010GLOBALGLOBALBlindness PVA

Stata and ML resources

ai generated, artificial intelligence, big data
Some links to Stata and ML resources Conference Articles / Presentations / Stata Journal Stata Blog Articles from 2020 Other Resources Seven Steps in developing a prediction model Source: Towards better clinical prediction models: seven steps for development and an ABCD for validation - PMC (nih.gov)

Visual Acuity Conversion Chart

In order to simplify my life when dealing with variations in Visual Acuity Charts when dealing with data from different surveys, I have created the following table for VA conversions What about PL+ / PL-, FCCF etc LogMAR for 1/60 vision is 1.78, rounded off to 1.8 as used in

ICD 11 Vision Categories

When analyzing data from blindness surveys, one needs to map out visual acuity against the Visual impairment categorized in ICD. There are some nuances, especially w.r.t Moderate visual impairment (MVI) based on the charts used as some VA charts yield 6/18 vision while others yield 6/19. ICD11 Categories Based on

Stata Code for generating corneal opacity outcomes from RAAB 6 surveys

grayscale photography of person's eye
Corneal Opacity Related Outcomes There are four sets of variables Stata Code The above Stata code can be used by anyone under a CC-BY-SA license.

Nginx, PHP, WordPress

Install Nginx and PHP-FPM PHP 7.2 FPM Install Wordpress Configure NGINX Complete Wordpress Installation

WordPress .htaccess

Enable Modules HTTP to HTTPS redirection of within site links Expires ensure that the deflate, headers and expires modules are enabled Apache Settings for speed Other .htaccess settings

Getting WordPress to work on 18.04 behind reverse proxy on SSL

On Nginx Reverse Poxy Create a configuration file in sites-available directory and symlink it to sites-enabled Files Limit on Reverse Proxy https://www.claudiokuenzler.com/blog/850/nginx-socket-failed-24-too-many-open-files. The default is set to a limit of 4096 files per (worker) process, which can be seen in /etc/default/nginx: EDITING THIS FILES DOES NOT HELP. Instead edit /etc/security/limits.conf: