Shapiro Wilk's test

Description

This function is implemented in the unique function for univariate statistical analysis 'univariate'. Performs Shapiro Wilk's test for normality on the dataset according to the class definition provided in the second column of the file. For details see 'univariate'.

Usage

shapiro(file)

Arguments

Author(s)

Edoardo Gaude, Dimitrios Spiliotopoulos, Francesca Chignola, Silvia Mari, Andrea Spitaleri and Michela Ghitti

Examples

## The function is currently defined as
function (file) 
{
    pwdfile = paste(getwd(), "/Univariate/DataTable.csv", sep = "")
    file = pwdfile
    x <- read.csv(file, sep = ",", header = TRUE)
    x.x = x[, 3:ncol(x)]
    rownames(x.x) = x[, 2]
    k = matrix(x[, 1], ncol = 1)
    x.n = cbind(k, x.x)
    sorted = x.n[order(x.n[, 1]), ]
    g = c()
    for (i in 1:nrow(sorted)) {
        if (any(g == sorted[i, 1])) {
            g = g
        }
        else {
            g = matrix(c(g, sorted[i, 1]), ncol = 1)
        }
    }
    dirout.r = paste(getwd(), "/Univariate/Groups", sep = "")
    dir.create(dirout.r)
    dirout.s = paste(getwd(), "/Univariate/Shapiro_Tests", sep = "")
    dir.create(dirout.s)
    for (i in 1:nrow(g)) {
        vuota <- c()
        fin = matrix(rep(NA, ncol(sorted)), nrow = 1)
        for (j in 1:nrow(sorted)) {
            if (sorted[j, 1] == i) {
                vuota <- matrix(sorted[j, ], nrow = 1)
                rownames(vuota) = rownames(sorted)[j]
                fin = rbind(fin, vuota)
            }
        }
        nam = paste("r", i, sep = ".")
        n = matrix(fin[-1, ], ncol = ncol(sorted))
        n.x = matrix(n[, -1], ncol = ncol(sorted) - 1)
        lastcol = ncol(sorted)
        n.x = n.x[, -lastcol]
        colnames(n.x) = colnames(x.x)
        name = as.matrix(assign(nam, n.x))
        shapname = paste("shapiro", i, sep = ".")
        shapiro = matrix(rep(NA, ncol(n.x)))
        for (q in 1:ncol(name)) {
            notAlist = c()
            notAlist = matrix(unlist(name[, q]))
            shapiro[q, ] = shapiro.test(notAlist)$p.value
            assign(shapname, shapiro)
        }
        outputfile = paste("r.", i, ".csv", sep = "")
        write.csv(name, paste(dirout.r, outputfile, sep = "/"))
        outshapiro = paste("ShapiroTest.", i, ".csv", sep = "")
        shapiro[is.na(shapiro)] = 1
        write.csv(shapiro, paste(dirout.s, outshapiro, sep = "/"))
    }
  }

Results