Any question answered...

I want a quick answer why 4 decimal places is overkill when presenting data. It's something I just "know" from the lab. But while I'm "sure" of the answer, for the current situation, I can't use the words to convince someone who is refusing to bend to my will.

It depends on the data, surely?

Are you adding / subtracting, or multiplying / dividing - you would need to reflect the DPs / significance of the source data, given expected measurement error and avoiding adding specious precision due to multiplicative / additive functions.

Surely once you get to four decimal places you should change units? :)

It's a percentage score. Which we use to rank things. FFS.
4 dp?
really?

accuracy, precision and resolution are not the same things

If you are not confident that you are accurate to 4dp then you shouldn't be using it

http://www.dartmouth.edu/~chemlab/info/resources/uncertain.html

If I was using it to rank I'd show only as many decimal places as is needed to separate entries.

If I was using it to rank I'd show only as many decimal places as is needed to separate entries.

This.

It's a percentage score. Which we use to rank things. FFS.
4 dp?
really?

how many things?

32 centres.
Overall % score in something. Calculated by their %score in 4 other fields.

Rank them by that score.

Surely, just giving an overall picture good, medium, shit, is better?
this is not rocket science.

I want a quick answer why 4 decimal places is overkill when presenting data. It's something I just "know" from the lab. But while I'm "sure" of the answer, for the current situation, I can't use the words to convince someone who is refusing to bend to my will.

Tell him to make it really accurate by adding 4 zeros to the end.

Take the data and display it as a pie chart, that way you are using the data, redundant level of detail included, but in a way that won't annoy the people forced to absorb said information.

Display the data as a Venn diagram.

32 separate, non-intersecting hoops, of the same size.

The colour of the hoops should be dictated by the percentage score, applied to the RGB colour scale. 0.0000% ~ 0:0:0, 100.0000% ~ 255:0:0

Explain that you can only show precision equivalent to 1 / 255th

They're basically being obstructive.

Offer to present the percentages on the offending colleague's penis. Then say there's not enough room for 4dp.

/sckbrn

"The number is 2.334WelcomeToJamaicaHaveANiceDay%"

What's the original version of this song called? http://m.youtube.com/watch?v=3hplRpOdOXE&desktop_uri=%2Fwatch%3Fv%3D3hplRpOdOXE
It has the same woo woo bits and one verse with an incredibly deep voice...

http://www.youtube.com/watch?v=atCwKBeq76w

OK, that makes sense. I didn't think there would be that big a difference though.

You have to compare like for like. A race standard tyre for cars will have a much more eye watering price than a race standard bicycle tyre and it will wear out quicker too.

A Gatorskin is a race standard tyre?

The cost of half a kilo of rubber is about 50cents, so pretty much the entire cost of tyres is in the design and manufacture.

`gatorskin is certainly a top spec training/commuting/touring type tyre. At £20 I dont think it is expensive. The only reason you wouldn't put it on a race bike is because it is heavy. These tiny weight savings are a big deal on a bike, not so much on a car especially on the tyres where a more powerful vehicle will eat rubber. This is why when comparing value through weight/volume of material is not really fair. If you want to do that, go find a car tyre designed to be lightweight.

Like someone else just said, handmade Veloflex clincher or decent Tub can be had for £30.

And what tester said is true also, higher end bicycle tyres are made in comparatively small volumes, different brands in different places and still handmade!

Anyone got any recommendations on job management/database software for a small limited trade company? Or is Access the best bet?

The cost of half a kilo of rubber is about 50cents, so pretty much the entire cost of tyres is in the design and manufacture.

Wonder how much rubber is in a tyre?

Look at motorbike tyre price.

http://www.youtube.com/watch?v=atCwKBeq76w

Cheers!

Its not straight up rubber that goes into tyres though, they have high tech ultra durable and also supple/lightweight casing and the rubber itself is mixed with all kinds of stuff to make a suitable compound.

I've noticed some people with roll top small rucksacks. A bit like dry bags but were the clip section seems to connect to the sides of the bag.

They look like the type thing you'd find in Blacks. I've searched on Blacks and Cotswolds but can' find them.

Anyone got any ideas?

Sealline or Ortlieb?
They don't clip on the sides though.
Very much the plastic canoe bag aesthetic too.

Can you use an old non-indexed shifter with a indexed rear mech?