Recent content by Wes Turner

I don't know what that is or how to do it. Is there a formula I can put in the Adjusted Rating column? I was thinking about calculating a confidence interval. Here's my first try at that. I calculated the confidence interval using the Excel T-distribution confidence interval function, then...

I would like a way to compare Amazon ratings as a function of the number of reviews. I think it's pretty clear that a product with a 4.9 rating based of 5,000 reviews is likely better than one with a 5.0 rating based on just 1 review. But how can I calculate an adjusted rating for a set of...

As I replied to you last time, I don't have a "foot" in this fight to get shot in -- by me or anyone else. I am just trying to provide the best tool for estimating the distance required to achieve some desired level of backyard quiet. I know it's not perfect and my neighbors know that also. I...

I used the formula above to add a third table. The top table (rows 6-9) show the percent reduction is sound pressure (power?) as a function of distance. The middle table shows that same change units of decibels. The bottom table shows the percent reduction in the perceived sound volume...

This is interesting. Yesterday, I came up with this equation that calculates the perceived sound as a function of distance. It appears to work as illustrated by this table, which calculates the percentage of the perceived sound at D0 that is perceived at D1: The distance at H23 is sqrt(10) and...

Jeez, man. I've said several times that the city scheduled a town hall meeting with representatives from the airport and FAA to discuss the installation of the GBAS and how it might enable the airport to make changes to the glide paths. They said that the current glide path puts the aircraft...

Now you are just being childish. I'm pretty sure the people leading that meeting knew exactly where the airport is and all of the parameters for a safe landing. Safety was discussed multiple times. The purpose of my table, as I have said many times, is just to give the community some mechanism...

I understand all that and I appreciate the perspective. But I would also appreciate some credit for attempting to provide my community with some tools to assess the plans. Everything I have said about the options were discussed and proposed by the experts at the meeting. I am not suggesting that...

That's what I thought before I attended the community meeting. The point of the meeting was to discuss the insytallation of GBAS (Ground Based Augmentation System), which allows much more precise control of the glide path. They discussed being able to adjust the glide path both vertically and...

This gets to my second point above to Sophie. Are you saying (or are you saying that Bell said or observed) that while doubling the distance reduces the power to 25%, not only is that not perceived as 25% as loud by people, but it has to get down to 10%, which means increasing the distance by a...

I think this is the key point -- or two points really. First, I really don't care whether the sound is louder as the aircraft is approaching, directly overhead, or going away. I only care about how loud it is at its loudest point. And unless that is a significant distance from directly overhead...

Thanks for that correction. I have now found that equation on several websites as well. And I just posted my corrected table. Thanks

The way I get pretty much everything -- by the seat of my pants. I looked at a bunch of websites, including Wikipedia. I was too lazy to go through all of the math and physics having to do with pressure vs voltage vs who knows what. But the phrase that I read over and over, including here, was...

It looks like I had an error in my formula for calculating the difference in decibel levels as a function of distance. If I understand it correctly, doubling the distance should subtract 6 dB. I believe the correct equation is: Here's a new table with what I believe are the correct values...

Good to have that confirmed! Yes, for 100dB, but not for 80dB as that was quoted in the city meeting. And I plan to convert this Excel sheet to a Google sheet so anyone can plug in whatever starting value they like. Exactly. Agreed. I appreciate the 0dB starting point suggestion. But I do...