# Trendsetting

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Model was written in NetLogo 5.2.0
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globals [color-mode] ;; 0 = default, 1 = source, 2 = times heard, 3 = popularity turtles-own [popularity trendy? trend-setter? interest-category trend-category trend-source times-heard] ;; popularity is a number value representing the degree of each turtle ;; trendy? is a boolean that is true if the person follows the trend ;; trend-setter? is a boolean that is true if the person is seeded the trend (i.e. the overall trend-starter) ;; interest-category is an integer representing the type of things the person is interested in ;; trend-category is an integer that represents the inherent type of thing a trend is ;; (corresponds with same values as interest-category) if the person is carrying a trend. ;; trend-source tells whether the turtle followed a trend from a friend, from the media, or both. ;; times-heard counts how many times a turtle has heard a meme patches-own [category] ;; category is an integer that represents the inherent type of thing a trend is ;; (corresponds with same values as trend-category of a person) ;; Create people and links. to setup ca set color-mode 0 ;; default create-turtles population [ set shape "person" set color blue ;; default "no-trend" color is blue setxy random-xcor random-ycor set interest-category random 10 ;; an "interest type" corresponding to one of 0-9 set trend-category -1 ;; -1 corresponds with "no trend" set times-heard 0 ] repeat population [ ask one-of turtles [ create-link-with one-of other turtles ] ] ask turtles [ set popularity count my-links ] ask patches [ set category -1 ;; -1 corresponds with "no trend", i.e. this patch is not a TV ] reset-ticks end ;; seed a trend to one random person to seed-trend ask one-of turtles [ set color red set trendy? true set trend-setter? true set trend-category interest-category ;; trend is given a "type" corresponding to the turtle's interest set times-heard 1 set size 1.5 ;; distinguish the trend-setter ] end ;; run the model to go ask turtles with [trendy? = true][ ;; ask the trendy turtles to spread the trend spread-trend ] ;; if media is turned on, every ticks a TV will flash in a patch with a turtle on it. if media?[ if ticks mod (media-frequency / 2) = 0 [ ask one-of patches with [count turtles-here > 0] [ media-trend ] ] if ticks mod media-frequency = 0 [ ask patches with [pcolor = white][ set category -1 set pcolor black ] ] ] recolor tick end ;; spreading the trend to spread-trend let target nobody set target one-of link-neighbors if target != nobody [ ask target [ ;; diff represents the difference between the turtle's interest category and the category of the trend. ;; the smaller the difference, the higher the probability that the trend will be passed to that turtle. ;; (i.e. if difference = 0, random number is chosen between 0 and 9. if difference = 9, random number is chosen between 0 and 99 let diff (interest-category - [trend-category] of myself) if 0 = random (10 * (1 + (abs diff))) [ set color red set trendy? true ;; if the turtle has already adopted the trend from media, ;; leave it be. otherwise, set its source to "friend" if trend-source != "media" [ set trend-source "friend" ] set trend-category [trend-category] of myself ] set times-heard times-heard + 1 ] ;; if a trend spreads between 2 turtles, turn the link between them red ask links [ if all? both-ends [trendy? = true] [ ifelse color-mode = 0 or color-mode = 1 [set color red] [ifelse color-mode = 2 [set color blue] [set color 83] ] ] ] ] end ;; when media? is true, patches run this procedure, representing TV-watching. ;; assume that a turtle will accept a trend regardless of category with media exposure to media-trend set pcolor white ;; the turtle watches TV ;; the TV broadcasts the current trend set category [trend-category] of one-of turtles with [trend-setter? = true] let watcher one-of turtles-here if watcher != nobody [ ask watcher[ set color red set trendy? true set times-heard times-heard + 1 ;; if the turtle has already adopted the trend from a friend, ;; leave it be. otherwise, set its source to "media" if trend-source != "friend" [ set trend-source "media" ] set trend-category [category] of myself ] ] end ;; procedure to recolor to the default scheme -- color-mode = 0 to recolor-default ask turtles [ ifelse trendy? = true [set color red] [set color blue] ] ask patches with [category = -1] [set pcolor black] ask links with [color = 83 or color = blue] [set color red] end ;; procedure to recolor to show source (friend vs media) -- color-mode = 1 to recolor-by-source ask patches with [category = -1] [set pcolor black] ask turtles with [trend-source = "media"] [set color yellow] ask turtles with [trend-source = "friend"] [set color red] ask turtles with [trend-source = 0] [set color blue] ask links with [color = 83 or color = blue] [set color red] end ;; procedure to recolor to display the number of times heard -- color-mode = 2 to recolor-by-times-heard ask patches with [category = -1] [set pcolor 3] ask turtles [set color scale-color green times-heard 0 world-width * 2] ask links with [color = red or color = 83] [set color blue] end ;; procedure to recolor to show popularity levels -- color-mode = 3 to recolor-by-popularity ask patches with [category = -1] [set pcolor 3] ask turtles [set color scale-color violet popularity 0 world-width * 2] ask links with [color = red or color = blue] [set color 83] end ;; procedure to recolor while the "go" function is running to recolor ifelse color-mode = 0 [recolor-default] [ ifelse color-mode = 1 [recolor-by-source] [ifelse color-mode = 2 [recolor-by-times-heard] [recolor-by-popularity] ] ] end

There are 4 versions of this model.

## Attached files

File | Type | Description | Last updated | |
---|---|---|---|---|

KristenAmaddio_June1.docx | word | Progress Report 3 | about 9 years ago, by Kristen Amaddio | Download |

KristenAmaddio_May18.docx | word | KristenAmaddio_May18 | about 9 years ago, by Kristen Amaddio | Download |

KristenAmaddio_May25.docx | word | Progress Report 2 | about 9 years ago, by Kristen Amaddio | Download |