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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

    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...
  2. 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...
    • Daaave
    • Thread
    • fitting forum plumbing query valve zone zone valve
    • Replies: 0
    • Forum: Plumbing Zone
  3. 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...
  4. M

    Pipe fitting welding courses

    Would a welding course help a plumber cross over to pipefitting?
  5. 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.
  6. K

    Hot water air lock after fitting new shower pump??

    Hi, I've just changed a stuart turner pump for a newer version (like for like). Cold water pressure is as should but hot water is trickling through maybe 35% of cold water pressure. I've turned pump off ran cold water for 5 min then hot water for 5 Min with shower head off to no joy any ideas...
  7. S

    Problem fitting new ceramic cartridge

    Hi, I had a leaking basin mixer tap. The Methven brand tap was leaking through the top. I was able to source 2 new replacement ceramic cartridges (1 as a spare). Both are identical to the old one. When I put either of the new ones into the tap & put it back together, the water won't turn on...
  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

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

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  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. dave100

    Does this type of 22mm fitting exist?

    Howdy, I am moving my cold water tank in my apartment bathroom and, as space is tight, I want to use a 90-degree elbow immediately after the water outlet at the bottom of the tank. The tank was fitted when the place was built here in Dublin 27 years ago. Here is the tank outlet: This...
  12. G

    SP140B vent pipe adaptor fitting

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  13. M

    Power flush before or after fitting new boiler

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  14. L

    Fitting shower base help

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  15. N

    Type of fitting to use

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  16. M

    fitting a macerator toilet in a garden room

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  17. A

    getting a wooshing sound in supply pipe after fitting new toilet

    Hi Just removed an old toilet and fitted a new push button cistern one. I had to re-route the supply water pipe over the waste pipe coming out of the back as i had to use a swan neck one to line up with waste hole in floor,and the water pipe didn't fit past waste pipe. I cut the supply pipe...
  18. 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...
  19. 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?
  20. R

    Freestanding bath fitting

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