leoschet

# author: ljsa @ cin.ufpe.br

# sd = Standart deviation
# confidence = (0~1)
# Obj: ver se o estado esta dentro da area de confianca da media
plotNorm = function(mean, sd, confidence){
  curve (dnorm(x, mean, sd), xlim = c(mean - (3*sd), mean + (3*sd)));
  
  left = (1-confidence)/2;
  right = confidence + L;

leoschet

# author: ljsa @ cin.ufpe.br

# two decimal places
decimal = function (number){
  return(format(round(number, 2), nsmall = 2));
}

# cast function
character = function (text){
  return(as.character(decimal(text)));

leoschet

# author: ljsa @ cin.ufpe.br

# dataset = vector of numbers
mode = function (dataset) {
  dataset = sort(dataset);
  
  maxTam = 1;
  curTam = 0;
  counter = 2;
  lastMode = dataset[1];