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Curve fitting is the process of constructing a curve, or mathematical function, that has the best fit to a series of data points, possibly subject to constraints. Curve fitting can involve either interpolation, where an exact fit to the data is required, or smoothing, in which a "smooth" function is constructed that approximately fits the data. A related topic is regression analysis, which focuses more on questions of statistical inference such as how much uncertainty is present in a curve that is fit to data observed with random errors. Fitted curves can be used as an aid for data visualization, to infer values of a function where no data are available, and to summarize the relationships among two or more variables. Extrapolation refers to the use of a fitted curve beyond the range of the observed data, and is subject to a degree of uncertainty since it may reflect the method used to construct the curve as much as it reflects the observed data.

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  1. C

    Fitting European shower trap to 40mm waste pipe

    Hi Everyone, Can anyone help? I have been searching but with no luck. I am trying to fit a Duravit shower trap which has a 50mm outside diameter euro pipe size outlet. I need to attach it to a 40mm UK size waste pipe and would prefer to solvent weld it as the pipe will be under a tiled...
  2. Robooo

    Fitting new radiator

    Hi, I'm studying plumbing and my work mate sized the opportunity to help him installing a new radiator. I'm looking for general advice which might eliminate mistakes. It'd also help me to build a portfolio before getting a job in trade. The house is old built and the rad goes into the kitchen...
  3. N

    110mm plastic pipe fitting toilet solvent

    Hiya, my toilet has 110 pipe going to master boss fitting. It's not glued and loose. I think as it's going to master boss that's why it's never glued. It has one drop of water leak after every flush. What I can use to stop leak at same time in utue if It needs to be removed it can be removed...
  4. P

    Soldering veiga fittings on gas

    Is there any clause that says I cant remove the rubber rind on a viega fitting and solder it on my domestic gas installation? Thanks
  5. fango7

    Pipe fitting from bathroom sink

    Hi all, Bit of advice needed. Waste water pipe from bathroom sink came loose last night caused some water damage to ceiling below. My question is the brown pipe seems to have came loose, but seems to have just been pushed into thread above.There is nothing holding it in place, is this...
  6. S

    Fitting 900mm shower door in 915mm space between walls

    I live in the UK and I need to buy a shower door to fit in a 915mm gap between two walls of my shower room. Most 900mm shower doors available here have 30-to-40mm inward adjustments to fit in a space that is slightly narrower than 900mm, or to address wall unevenness, but not outward...
  7. M

    Council bathroom fitting

    Anyone worked for the council installing bathrooms/kitchens possible adaptations?
  8. A

    How to convert a 15mm tap tail to a 3/8" fitting

    Hi, I am trying to fit a replacement tap to a mini-sink that's built in to the top of a toilet. The original tap isn't made any more by the manufacturers - the nearest equivalent is apparently this one: GoodHome Lazu 1 lever Mini Contemporary Basin Mono mixer Tap | DIY at B&Q -...
  9. D

    What’s the name of this fitting

    This fitting is used on a glycol system. It’s cracked and need to find a replacement.
  10. B

    Garden Tap fitting- thread size.

    Hello. I've attached an image of an old garden tap with a new garden tap replacement, except the thread on the new tap is larger than the existing tap fitting. Is there a reducing nut that can adapt the new tap to the wall fitting or could the new tap handle be used to replace the old handle and...
  11. S

    Waste to trap loose fitting

    just put a new pop up waste into my basin to find the trap does not fit correctly.. the trap fits just inside the waste thread opening and butts up against the plastic shoulder ensuring the rubber seal is pressed against the end Face of the waste. im able to screw the nut up but even when its...
  12. G

    Identification of UFH Pipe Fitting

    Morning, Doing some work on our UFH manifiolds and was wondering if anyone would be kind enough to let me know what the T-fittings in the picture are, thought they might be some kind of tektite fittings? Many thanks.
  13. B

    Fitting a pocket door.

    Have an en-suite to create from scratch, customer would like a pocket door into the room. Can anyone recommend a kit they have used, studwork will be 38 x 89 cls with 12.5” plasterboard and skim coat (~120mm total). I will be doing all the work but have never fitted one before. There seems to...
  14. H

    Which fitting for trite on shower replacement?

    Hi there, First time changing a shower or any sort of plumbing work really. Previously had an old Gainsborough shower unit which packed up yesterday, so I’ve bought a tritron easi fit today with the hope that it would require minimal effort haha. Only issue I have is the water pipe on my...
  15. C

    Fitting non return valve

    The discharge hose from our washing machine comes out of the machine, runs about five feet along the floor under the work surface and then goes vertically up under the sink where it joins the sink discharge pipe. Every time we empty the sink, the water often goes back down the hose and even...
  16. J

    Shower fitting advice

    I have an existing shower which I've removed and exposed the two pipes from the wall. If I was taking a guess they're around 2cm ish in diameter. I have the Mira shower here is the instruction guide...
  17. L

    Fitting a Macerator behind a CC Toilet

    Hi Guys I am at the design stage of having a En-Suite built and have an issue that I cannot seem to resolve. For long and complex reasons I have to have a macerator and that needs to sit behind a close coupled toilet. this will take the waste from a sink, shower and toilet. Saniflow say I need...
  18. L

    Fitting a macerator behind a CC toilet

    Grudfos do a unit called Sololift WC3 that has a recessed front that suggests it might fit behind better but as I cannot get to speak to anyone at Grundfos other than an automated messaging system, I cannot confirm this. So my question is, have any plumbers on the forum had issues fitting...
  19. G

    Identify Unknown Pipe Fitting

    Hi, Hoping that someone could please identify what this leaking fitting is, such that I can explain it to a plumber. Not sure whether the groove on the top is a location where you can tighten these "fittings", or whether that is best left to a professional to deal with. Many thanks for any help.
  20. T

    New sink flexible hose nut leak at fitting.

    Hello , Should i tighten more or should i buy pulmber tape or its not that bad to leave like this permenantly? Thanks.
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