Spread of fake news during crisis situation

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Default-person Anshul Agrawal (Author)

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Model was written in NetLogo 6.1.0 • Viewed 76 times • Downloaded 2 times • Run 0 times
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extensions [ nw ]                                     ;; extension for creating network

turtles-own [
  aware?                                              ;; awareness status
  seed?                                               ;; Seed status
  tick-become-aware                                   ;; time of becoming aware
]

globals [previous-count]


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;;    Methods to set up the network and initialize the nodes.
;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to setup
  ca

  reset-ticks
  let edge-prob (2 * mean-degree-of-network)/(num-agents - 1) ;; density of network decider
  nw:generate-random turtles links num-agents edge-prob [  ;; create the agents based on the slider in a random network

      set aware? false                                ;; adoption property is initialized
      setxy random-xcor random-ycor                   ;; separate the turtles spatially
      set color white                                 ;; consistent appearance
      set shape "person"
      set seed? false

    ]

  ask n-of num-seed-informers  turtles [              ;; setting up seed agents based on slider
    set aware? true
    set tick-become-aware -1
    set color orange
    set seed? true
  ]

  repeat 30 [ layout-spring turtles links 0.2 10 10  ]

  set previous-count (count turtles with [aware?])
end 


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;;;
;;;    Method to run the model.
;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to go

  if (not any? turtles with [not aware?]) [
    stop
  ]
  ifelse cascade-model? [
  ask turtles with [tick-become-aware = (ticks - 1)] [
    pass-adopt
  ]
  ask turtles with [not aware?][
    adopt
  ]
 ][
    ask turtles with [not aware?] [
      adopt-bass-model
    ]
 ]

  ;; To Stop model from running forever when broadcast-infleunce is zero
  if (previous-count = count turtles with [aware?]) and (broadcast-influence = 0)[
    stop
 ]
  set previous-count (count turtles with [aware?])


  tick
end 

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;;    Method to reset the diffusion in same network
;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to reset-diffusion
  reset-ticks

  ask turtles with [not seed?][
    set aware? false
    set tick-become-aware -2
    set color white
  ]

  ask turtles with [seed?][
    set color orange
    set tick-become-aware -1
  ]

  set previous-count (count turtles with [aware?])

  clear-all-plots
end 


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;;    Method to reseeding the same network
;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to reseed-network

  reset-ticks

  ask turtles [
    set aware? false
    set tick-become-aware -2
    set seed? false
    set color white
  ]

  ask n-of num-seed-informers turtles [
    set aware? true
    set tick-become-aware -1
    set seed? true
    set color orange
  ]

  set previous-count (count turtles with [aware?])

  clear-all-plots
end 

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;;    Methods to adopt information in Cascade model
;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to adopt
  if random-float 1 < broadcast-influence[
    set aware? true
    set tick-become-aware ticks
    set color red
  ]
end 

to pass-adopt

  let neighbors-unadopted link-neighbors with [not aware?]

  if count neighbors-unadopted > 0[
    ask neighbors-unadopted[
      if random-float 1 < influence-rate [
        set aware? true
        set tick-become-aware ticks
        set color yellow
      ]
    ]
  ]
end 


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;;    Method to adopt information in Bass model
;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to adopt-bass-model

  ifelse random-float 1.000 < broadcast-influence [
    set aware? true
    set color red
  ][
  let neighbors-adopted link-neighbors with [aware?]
  let total-neighbors link-neighbors

  if count total-neighbors > 0[
  if not aware? and random-float 1.0 <  (influence-rate * (count neighbors-adopted / count total-neighbors)) [
    set aware? true
    set color yellow
      ]
    ]
  ]
end 





There is only one version of this model, created 5 months ago by Anshul Agrawal.

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