zmVault/statistical-modeling-for-construction-estimating.md

id, aliases, title, tags

id	aliases	title	tags
		Statistical Modeling for Construction Estimating	authorship/original destiny/permanent status/incomplete topic/construction topic/estimating topic/math/statistics type/cross-topic

Statistical Modeling for Construction Estimating

Cross-topic of statistical-modeling and construction-estimating.

Bayesian Takeoff

User Story

Frank is estimating a 20-story high rise and notices that their are roughly, but not exactly, the same number of receptacles in the corridors of levels 2 to 19. Frank starts a new takeoff for duplex receptacles, typical of levels 2 to 19. He counts and inputs quantities for 3 levels, each adjusts the prior to calculate the expected quantity for all 18 levels.

Stochastic Branch Takeoff

generate a BOM from point loads distributed in a space.

- x: 302.84
  y: 2364.47
  kW: 5.3
  voltage: 277
  phases: 1
...

determine relative impact of factors

• allowable voltage drop

Methods

[!cite] Reddit u/mightofmerchants !spatial-sampling.gif

• Poisson disc sampling
• Delunay triangulation
• Voronoi diagrams

%% TODO: link paper on procedural generation of single family homes %%

Average Distance Given Area

Holding area constant, average taxicab distance between points varies greatly with the aspect ratio of the space. Weighted by a probability distribution an average length and confidence could be given for any known area.

sigmoid-functions

Maximum area per floor is sometimes capped by ibc-construction-types or ibc-occupancy-classifications, either directly (see ibc_ch05, ibc_ch09), or by maximum travel distance (see ibc_ch10). Stairwells are expensive. There are usually only 2 or 3.