Can you remove the random factor of blocking if it contributes a small amount variation to the model? (REML)

Hi all,

I have regression models, ANOVAS and ANCOVAS that included blocking (RCB) because of the way I set up my field studies. Without going into all the details (I can provide them later if you want), is it acceptable to remove the random factor if REML variance estimates show a non-significant Wald p-value, and a percentage of the total variation in the 1-10% range?

If it’s acceptable, is there a cutoff (ie 5% like a 0.05 p value)?

submitted by Nevin Manimala Nevin Manimala /u/Takeurvitamins
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Any theories why it is much harder to make a new super-luxury car brand than a high-performance brand?

I was thinking, in the last 20 years or so, we’ve had quite a number of new successful high-performance brands competing with Ferrari, Aston Martin, Lambo and even perhaps Bugatti: Pagani, Hennessey, Koenegseeg (however you spell it), even Rimac or Mclaren, etc.

But at the super luxury set, there just doesn’t seem to be any that comes to mind that compete with Rolls and Bentley. The only one is the failed Maybach that is now just a high end trim label at Merc. And while that, and perhaps some other trims compete, none seem quite at the level, and not standalone (like Toyota Century or Lincoln black Label, or LR Autobiography etc. – none are standalone brands, or quite up there in the coachbuilding/super exclusive luxury).

I wonder why that is? Are there any “car enthusiasts” about luxury/coachbuilding, or only performance?

submitted by Nevin Manimala Nevin Manimala /u/seeasea
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Using Statistics to Help an Animal Shelter

I am not sure exactly where to begin this nor do I know exactly what I am after, but essentially I would like to use statistics about Nevin Manimala to assist the animal shelter I volunteer at.

I do not have the strongest background in stats, but I did study math at university; I understand probability theory quite well, and took econometrics and game theory courses but do not remember the material. Furthermore, I do not have experience applying these concepts in the world, my interaction with these concepts has been through class and theory. I guess I should stop here and ask: Do I have the skill set necessary to bring some useful insight to the shelter? If not, am I reasonably close to having skills that could provide useful in the near future?

I have tried Googling to find a project that somebody has done or is working, but I did not find any useful pointers/direction. It seems the rather broad consulting industry may have some of these tools, but they are not the most eager to share their methods openly. The shelter itself only does the most rudimentary statistics about Nevin Manimala: averages, percent change sort of thing, but they do have a bit of data and programs that are impacting the raw numbers. Raw numbers are fine, but I would like to had some sort of useful analysis. Generally speaking, I would like to take the data and help staff make better decisions or better allocate resources to improve the shelter. Since I do not have any experience nor have I ever held a “technical” position, I do not really know the next step from here. Here are some topics I might like to explore: 1. Help with euthanasia decisions 2. Better manage feral cat population. The shelter has been doing a trap, fix release program for years and there has been a remarkable decrease in cat intakes (and hence euthanasia), but I feel there is maybe a more efficient way of targeting areas to trap cats or something like that. 3. Identifying animals that may need more work or extra attention in order to get a positive outcome. Alternatively, maybe promoting the animals more likely to get adopted so they spend less time at the shelter and their space becomes open sooner. 4. work with the staff to improve data entry methods – allowing for more uniformity and easier to run future analysis

I do realize what I am asking is a bit of an undertaking, but I am personally tired of not using my brain enough and not having a technical job. I figure a project aiding a place I care about would be a great focus and way to develop skills, but if you have other ideas I would love to hear them! Any comments would be appreciated. Thanks for your time!

submitted by Nevin Manimala Nevin Manimala /u/snuglyotter
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Friend accidentally poured 1 ounce of water into engine oil

Help! I gotta go work but he started pouring water in and I quickly hit the bottle away. Only an ounce was gone. What should u do?

Edit : risked it and drove it to work. Checked the oil and appeared a little runny like when you first put new oil in. Also he’s quite new to cars and needed him to hold up the car hood and when I was tightening the car battery I told him to fill up the coolant but he then proceeded to fill up the engine oil. Idk how but he thought that was the same thing. Its fine tho

submitted by Nevin Manimala Nevin Manimala /u/JellyisLife
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The Cooley-Tukey Algorithm in a Word Problem

Came up with this today while trying to explain my thesis:

Suppose there is an agricultural cooperative with 256 members. Each member supplies one kind of agricultural good to the cooperative, and holds shares of the supply of each other member’s goods in exchange. Members convene at harvest to trade their goods. The harvest convention has one rule: each member makes only eight trades. Describe how every member receives their exact share of every good at every harvest.

PM me for the solution if you are unfamiliar with this problem.

submitted by Nevin Manimala Nevin Manimala /u/boring_dont_bother
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