Created
August 22, 2016 03:33
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wss <- (nrow(mug[,7:9])-1)*sum(apply(mug[,7:9],2,var)) | |
for (i in 2:10) wss[i] <- sum(kmeans(mug[,7:9], | |
centers=i)$withinss) | |
plot(1:10, wss, type="b", xlab="Number of Clusters", | |
ylab="Within groups sum of squares") | |
#determines k=5 | |
set.seed(123) | |
mugCluster <- kmeans(mug[, 7:9], 5, nstart = 100) | |
#observe patterns in each cluster, rename clusters by their characteristics, then #use it as a new variable: Difficulty | |
mugCluster$centers | |
mugCluster$cluster <- factor(mugCluster$cluster,levels=c(2,1,5,4,3)) | |
levels(mugCluster$cluster) <- c("Inconclusive","Easy to Find Mugs",'Medium Difficulty', | |
"Hard to Get Mugs","Very Hard to Get Mugs") | |
mug$Difficulty <- mugCluster$cluster |
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output$kmeans <- renderPlotly({ | |
plot_ly(data = mug, x = Owner, y = Seeker, mode = "markers", | |
text= paste(Name, "<br>Edition: ", Edition, "<br>Country: ", Country, | |
"<br>City: ",City, "<br>Owner: ",Owner,"<br>Seeker: ", | |
Seeker,"<br>Trader",Trader, "<br>Difficulty: ",Difficulty), | |
color = mugCluster$cluster, | |
colors =c('olivedrab','navyblue','indianred2','darkgoldenrod1','magenta4')) %>% | |
layout(title='K-means Clustering: # of Seekers vs. # of Owners') | |
}) |
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