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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. B

    What is this Lp fitting called?

    When I disconnected my natural gas cooktop this part was split in two. I have been to big box hardware store and they don't know what it is. Any help naming it and where can I get one. See part and the cooktop attachment. Thanks for any help!
  2. R

    Freestanding bath fitting

    I have a freestanding bath with claw feet, the overflow, shallow waste and outlet are all exposed and chrome. The pipework will then go under the floor which will be tiled and finished before the bath is fitted. How do I connect the chrome pipework that is above the floor to the pipework that is...
  3. michcosg

    Possible to push a push-fit fitting back on a pipe at 3 bar?

    Hi Folks I am considering a job in council block flat which involves amending 15mm copper pipework under 3 bar of pressure. The problem is the local council seem to a bit hard to get a hold of to turn off the water! Thus my plan was to freeze the pipe with an electrical freezing kit and do...
  4. Rooo77

    L shape bath fitting advice.

    I've been doing the whole bathroom up and about to fit an L shaped acryclic bath, i'm going to baton each end of the wall and the against back wall to support it, will i need to frame / uprights the front of it, or will the gloss finished mdf panel be enough? The bath itself has wooden blocks...
  5. A

    Franke Atlas tap pull out 15mm hose fitting tail

    Hello: obsessed with trying to resolve a Franke (Atlas kitchen tap ) pull out hose issue: the hose seems to be 14mm - the tail standard 19mm? Seems a connector missing (now lost). If anyone knows how or where to bodge or find spare - ideas all gratefully received :cool:
  6. O

    How many turns when fitting compression isolation valve?

    I've never done one before and, as usual, Google is offering conflicting advice. I'm fitting one of these (from Screwfix, 15mm). I've read that ... Over tightening is the commonest cause of leaks. Once you've got it finger tight, you need to tighten a further half turn / full turn / one and a...
  7. B

    fitting a shower pump

    I am pricing for a new bathroom the possible problem is the the customers water supply is a borehole which is pump to a tank in the roof then supplies the house from the tank by gravity can i fit a shower pump or power shower on this type of system its the first time I have seen this type of...
    • BenJamin Mallabar
    • Thread
    • america fitting pump shower shower pump usa
    • Replies: 1
    • Forum: USA
  8. K

    Fitting a 52mm chrome spacer on 44mm hole?

    Hi folks, Purchased E1486AA Ideal Standard Luxury pop up bath waste and overflow as recommended to fit Ideal Standard Tempo Arc straight bath 1700 x 700. Website advises it will fit both a 52mm and 44mm overflow hole but the chrome spacer is 52mm and as such won't fit through the 44mm hole to...
  9. S

    Shower tray waste pipe fitting

    I am really struggling with how to do the waste pipework from a shower tray and would appreciate any advice on the best approach to take. The tray will be sitting in a three sided recess which really complicates things. A further complication is that the soil pipe is very close by and so there...
  10. H

    Pressure loss in Heating System post fitting new Expansion Tank

    Hi, hope someone can help me with a heating pressure loss problem. My valiant boiler has been loosing pressure over the last few months, resulting in me having to top up the water every week or so. Managed to get a boiler engineer to visit who diagnosed a faulty expansion tank. (Water evident at...
    • Hoppers
    • Thread
    • america central heating system expansion fitting heating heating system new pressure pressure loss system tank usa
    • Replies: 26
    • Forum: USA
  11. M

    Polypipe fitting unwinding itself

    Hi has anyone had an issue with polypipe fittings unwinding them selfs over time?
    • Matt0029
    • Thread
    • america fitting itself polypipe usa
    • Replies: 0
    • Forum: USA
  12. J

    Anybody recognise this old tap fitting

    • johnwilky53
    • Thread
    • america anybody fitting old recognise tap usa
    • Replies: 10
    • Forum: USA
  13. D

    Plastic to metal fitting

    Hi, I'm installing a water filter which has plastic inlet and outlet fittings like this... The suggested way is to go straight to flexible pipe with fibre washer and a 90 degree bend... ...but the pipes supplied have the wrong size at the far end. I have some other flexible pipes I want to...
    • davblo
    • Thread
    • america fitting metal plastic usa
    • Replies: 9
    • Forum: USA
  14. N

    Please Help to Identify Brass Fitting

    I have a vintage tank with a tapered brass fitting fixed in. A new mating fitting is required. The thread is 7/8" max with 26 tpi and it is tapered. 7/8" 26 is a standard British Standard Brass (BSB) thread, but tapered? I can find no reference to BSB tapered. Help?
    • Neil
    • Thread
    • america brass fitting help identify please usa
    • Replies: 5
    • Forum: USA
  15. M

    MLCP pipe / fitting compatibility

    Has anyone had any issues mix and matching different brands of MLCP pipe & fittings? I usually buy Uponor, and currently have a big stock of fittings, but I am keen to buy some cheaper pipe to use with them.
    • MOSSEP
    • Thread
    • america fitting pipe usa
    • Replies: 3
    • Forum: USA
  16. P

    Fitting baby belfast sink on brackets, what screws & general advice

    Hi all I've got an old baby belfast sink I want to use and I'd like to mount it on old brackets... I've done a mock installation in another part of the house just to see how secure it feels on the brackets and I'm happy with the result. If I put a lot of downward wait on the front lip of the...
    • Plumb Line
    • Thread
    • advice america baby brackets fitting general screws sink usa
    • Replies: 9
    • Forum: USA
  17. S

    Flexi tails fitting advice

    Hi guys Im replacing a set of basin taps with a v&b mixer tap. The flexi tails attached to the tap body have got some fitting ends that I've not seen before The instructions have some images of what look like push fit sockets (not supplied) I want to fit the tails to 15mm copper pipe...
  18. D

    Fitting Mcalpine waste trap

    Am replacing a rubbishy old waste trap and have bought the McAlpine 1.5-2 sink kit with 40mm pipes. Problem is that the end which connects to the outside pipe is neither in line with it nor close to it (several cm away). What can I use to connect it - I was looking at the McAlpine FLEXCON4...
  19. Bogart

    Tight compression fitting

    Trying to get the 3 port valve off so I can get on with changing from Y plan to S plan. Problem is one of the compression treads will not come free. And being sods law it is the one feeding into the DHW tank. Have tried brute force with 2 large spanners, tried heating it, and freezing it and...
  20. B

    Does 15mm copper have to reach right to the back of the fitting when soldering?

    I want to solder a 15mm end-feed elbow onto a straight run of pipe to join it up to a radiator. I've cut the existing pipe run just a fraction too short to come straight up to hit the radiator valve, but I'm hoping it could still work... How important is it that the copper pipe is pushed all...
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