Author: iopadmin

  • Old Family Pictures

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    For Christmas I received a box of slides that had belonged to my grandfather. The slides were 35 mm taken between 1955 and 1961, in a mixture of black and white and color. I do not own a slide projector, and some of the film was starting to deteriorate, by yellowing or showing blotches where…

  • Ballistics and Repeatability – A Fuller Solution

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    The last post relied on the Monte Carlo method to determine the probability of correctly assessing relative accuracy. The linked document is a more a complete answer without any of the Monte Carlo drawbacks. 20091213_Hays-LoadComparisonStats

  • Ballistics and Repeatability

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    I have a rifle that shoots 3-inch 5-shot groups at 100 yards.  This is not adequate for hunting where commonly shots are 200 to 300 yards distant.  As I work toward resolving this, there are some interesting statistical problems of practical importance. In each experiment, how many shots should I fire to measure the spread,…

  • Behold! A Number Pad.

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    My beloved Advance clock died about two months ago.  It did not surprise me to learn that there is no equivalent marketed anywhere at any price.  I post this picture in honor of this acme of alarm clocks.

  • Ants!

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    This morning, in the back yard, the ants swarmed. The first picture shows the main cluster of the swarm, the posts in the background are railroad ties, which are about nine inches wide. The swarm footprint is a semicircle cut from a circle about 18 inches in diameter. There was no obvious reason why the…

  • Focus Stacking and a Moth

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    We found this really neat moth on our porch several days ago. It had already departed. It was in immaculate condition, and seemed the perfect opportunity for some focus stacking effort. As usual I used CombineZM for the processing, and my Nikon D40 with el cheapo Phoenix 100mm f/3.4 macro lens. Combination of about 20…

  • Really Big Bee

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    This morning I had the door open to enjoy some late spring fresh air. We had a visitor enter the house. She is perished, alas, but she is also the largest bee I have ever seen. Tip-to-tip, unfolded, she is just over an inch long without including her stinger. She sounded like a humming bird.…

  • Dogs on the Roof

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    Oh, the things you’ll see. After dinner yesterday I was looking out the kitchen window, and lo, there were dogs on the roof of the house across the street. Two medium sized, confident, bold, and clearly well-loved dogs. The story evolved a little, but I’ll never tell it better than the pictures.

  • Food Storage and Refried Beans

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    A solid storage plan includes food, and also anything else you need to make the stored food into something edible. The difficulty is that none of the food storage guides or recipe books I have list how much fuel to store in order to make their recipes. To rectify this, I have begun measuring fuel…

  • Coffee: Model Fitting Goodness

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    You have seen the response function contours through the stationary point, and you have seen the 3D response function visualizations. You may recall that I have two competing models, one is derived from the experimental data design for the response surface, and the other is all that data and the screening results too. Is either…