Question

How do I make my graphs show positive numbers? The binomial answers are all positive, but the graphs keep showing a negative.

24 20 21 # R- Code Probability Distribution 22 x <- seq(0,4, by = 1) 23 dbinom(0,4,0.6) 25 dbinom(1,4,0.6) 26 dbinom (2,4,0.6) 27 dbinom (3,4,0.6) 28 dbinom (4,4,0.6) 29 par (mfrow=c(1,2)) 31 shadeDist(dbinom (0,4,0.6), lower.tail T, xlab "Probability Democrats win 0", main "Political Races") 32 shadedist(dbinom (1,4,0.6), lower.tail = T, xlab "Probability Democrats win 1", main "Political Races") 33 shadeDist(dbinom (2,4,0.6), lower.tail = T, xlab = "Probability Democrats win 2", main "Political Races") shadeDist(dbinom (3,4,0.6), lower.tail = T, xlab "Probability Democrats win 3", main = "Political Races") 35 shadedist(dbinom (4,4,0.6), lower.tail = , xlab "Probability Democrats win 4", main "Political Races") 361 37 38 39 36:1 (Top Level) 30 = = = = = = 34 = R Scri

Answer 1

Correct Code is :

shadeDist(xshade=0,ddist="dbinom",parm1 = 4,parm2=0.6,
          xlab="Probability democrats win 0",main="Political Races")


shadeDist(xshade=1,ddist="dbinom",parm1 = 4,parm2=0.6,
          xlab="Probability democrats win 1",main="Political Races")



shadeDist(xshade=2,ddist="dbinom",parm1 = 4,parm2=0.6,
          xlab="Probability democrats win 2",main="Political Races")



shadeDist(xshade=3,ddist="dbinom",parm1 = 4,parm2=0.6,
          xlab="Probability democrats win 3",main="Political Races")


shadeDist(xshade=4,ddist="dbinom",parm1 = 4,parm2=0.6,
          xlab="Probability democrats win 4",main="Political Races")

You have to understand the arguments used by the function shapeDist .

The Main Arguments are :

ddist : Where you have to specify which distrubution you want to draw the pdf if , here it is dbinom . You have to input as a character , thus "dbinom" .

parm1 and parm 2 are the two parameters of the distribution , here n and p respectively .

xshade : The point where you want to start/end shading .

** In your code , as you have put wrong arguments , by default R chose "dnorm" in ddist argument thus showing negative value and a symmetric Normal distribution .