• Welcome to PlumbersForums.net - The international free plumbing advice forum. Professional plumbers sharing advice with fellow plumbers and DIY alike. Register for free today! - Checkout the Plumbing Advice forum and then our Plumbing Videos area which still needs populating.


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.

View More On Wikipedia.org
  1. B

    Fitting a cistern (with frame) into a stud wall (100mm) (follow-up)

    Hello all, This is a follow-up to this post: Fit wall-hung toilet to inside stud wall? - https://www.plumbersforums.net/threads/fit-wall-hung-toilet-to-inside-stud-wall.127877/. I'd like to fit a cistern into a stud wall, which is 100mm wide. Typically, the dimensions of the toilet fixing...
  2. J

    Shower tray installation: Easiest method of fitting

    Hi guys Just looking for advice on how to make the installation of a 1200x800 stone resin tray easier. I'm fitting a tray into a space with three walls, so obviously space is minimum. The last time I did this I rigged up a pulley from the ceiling joists to raise and lower the tray into position...
  3. C

    Corner valves for a radiator

    Hi, I have bought corner valves to use on a new towel radiator. As you can see in the attached pic, one part of the valve has a small circular hole in it, and the other part has a large semicircular hole. Which end - 1 or 2 - should I connect to the water pipe and which end should I connect to...
  4. Daaave

    Fitting zone valve query

    Hi all, I have a 28mm zone valve for a C Plan I want to fit and would appreciate some advice please. I’m looking for the best way to adjust the existing pipework - my idea is to fit the valve at the green circle, tee off beneath it for the vent pipe and cap off the reducer at the cylinder...
  5. T

    Advice on fitting Nest or Hive Controllers.

    I currently have normal programme controls with thermostat for 3 zones (3 floors). The main controls are located together on the ground floor and individual thermostat controls on the 2 other floors. Would either a Nest system or Hive be adaptable, if so any advice on which would be best & how...
  6. M

    Pipe fitting welding courses

    Would a welding course help a plumber cross over to pipefitting?
  7. A

    Flexi hose leaking at fitting.

    Hi, the fitting on my flexi hose that goesto my cistern is leaking slightly. Has anyone got any advice? Thanks Andrew.
  8. D

    Options for Soil Pipe/Toilet fitting that conceals the pipe?

    Options needed for Soil Pipe/Toilet fitting. Hi Everyone. - I'm planning a bathroom remodel, and my wife would like a solution that covers the soil pipe up if possible. However, the toilet pipe sticks out from the wall 23cm, and raises from the floor to the mid point of the pipe 21cm. The...
  9. M

    URGENT My t valve seems to be too thick for my shark bite cylinder

    I cannot get my shark bite fitting to fit over the white supposed to be a half inch copper T valve is it because it’s corroded just seem to be too thk
  10. J

    What fitting is this? Shower

    Novice here - Looking to switch out the arm and head on an existing over-bath shower. The old head seems to have been a push fit however the new is a 1/2 screw fit arm. I've attached a picture but wondering whether the whole bracket/fitting needs to be replaced or if the outermost nut will...
  11. G

    SP140B vent pipe adaptor fitting

    Hi, ive recently purchased a Sp140b adaptor for cement pipe to 110mm plastic. When I've looked the vanes end is fine to put into cement pipe but where it has described the other end as push fit I was expecting to see some kind of o ring or seal for 110mm plastic pipe to slot into. Would I be...
  12. M

    Power flush before or after fitting new boiler

    My plumber's quote for fitting a new boiler (Ideal Logic Max Heat only 24kw) says he will "use a power flush machine that will flush all the black dirty water once the new boiler is installed and add heating inhibitor" Is that correct ? will it send the sludge etc into the new boiler or should...
  13. L

    Fitting shower base help

    I’m about to install a shower base onto a wooden platform that sits about 4 inches high so as to allow the trap to sit under. The instructions calls for 8mm of soft cement to be laid for the base to go onto. I’m concerned on a number of issues including:- The U space cavity the shower base...
  14. N

    Type of fitting to use

    Hi I have been to look at a leak just below there stop tap..they have had the stop tap changed in the last couple of weeks and the fitting below the stop tap is leaking and the plumber won’t come back … I haven’t seen this particular arrangement before it appears to be black alkathene with a...
  15. C

    Fitting bathroom towel radiator fitting questions?

    Hi there, i’m in the process of remodelling a new build home and have a towel radiator i will be fitting soon to replace an ugly traditional radiator in the bathroom that was fitted by the builders. The fitted radiator has been removed, the pipes are “polyfit” brand 10mm plastic...
  16. S

    Fitting a shower in place of sink

    Bathroom is downstairs, combi boiler upstairs, in the bathroom their used to be a bidet, we are toying with the idea of moving the sink to where the bidet was as the piping is still there and then using the piping from the sink to fit a combi shower. Is this feasible?
  17. R

    Freestanding bath fitting

    I have a freestanding bath with claw feet. The overflow pipe, low level u bend and waste pipe are all chrome and above floor level. How do I connect this waste pipe to the pipe work under the floor as obviously the floor needs to be finished before the bath is positioned. Thanks Roy
  18. 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!
  19. 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...
  20. 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...
Creating content since 2001. Untold Media is a Registered Trademark.