Testimonials

I want to thank you very much for your random number generator! We teachers are supposed to check for understanding with all of our students. I am sure you are aware of all the stumbling blocks to actually calling on students randomly. I hope that your random number generator, with its ability to generate integers within the range that I specify, will help me to better sample my students for their understanding. More important to the students is the classroom jobs like setting up the technology each day, passing out folders, etc. (I teach 6th Grade in the USA.)

The most important feature of your generator is the ability to set the range/limits!

I tried popsicle sticks in a can but found that method to be ‘uncannily’ unfair! It seemed like I kept getting the same sticks!

I tried writing numbers on index cards, but I can't shuffle cards to save my life! (Besides, when I pick the cards without looking, you know there is bias in that as well … somewhere in my brain.)

I finally purchased some dice from the net that have various numbers of sides. But that didn't work either because the number of students in my class changes throughout the year as the students in our area have a somewhat high transiency rate.

I was at a loss, and the students have been getting upset with me.

In the past I have Googled for something like this, but I guess I never quite put in the correct words to arrive at your site, but I THANK GOD THAT I FOUND YOUR SITE TODAY! And, yes, you may use this testimonial!

—Shannon Clark, Los Angeles, USA

I study the life-cycle of viruses, and I perform lots of tissue culture experiments. In order to try to develop theories to explain some results I was getting, I wrote a computer program that uses a Monte Carlo scheme to simulate infection of cells by viruses. I need a different random number for each simulated virus, in order to randomly assign it to a cell that it ‘infects.’ In order for the results to be meaningful, I need to simulate tens of thousands of ‘cells’ and hundreds of thousands of ‘viruses,’ so I need hundreds of thousands of random numbers. The pseudo-random numbers produced by the Apple Macintosh built-in linear congruental generator proved themselves to be not good enough for the job, as I found that some numbers were chosen too often, a definite no-no for my purposes. Then I saw the NY Times article about this site and gave it a try. First I tried using Random.org numbers to seed the Macintosh generator at frequent intervals during the execution of the simulation, but it did not solve the problem. So I tested using all numbers from this site and they passed my quality test. So now I download several batches at a time of 10,000 numbers between 1 and 40,000 and string them into big files as the sources of my numbers. I'd like to be able to download them in even bigger batches, though. Thanks for a truly useful service!

—David N. Levy, University of Alabama at Birmingham