title: Remove 'y' label from plot in R
body: <p>Does anyone know how to extract the 'y' off the y-axis while preserving the variable names in the following plot:</p>
  
  <pre><code>par(mar = c(5,7,4,2) +.01)
  matrix &lt;- matrix(rnorm(100) ,ncol = 2, nrow =6)
  y &lt;- 1:6
  par(mar = c(5,7,4,2) +.01)
  plot(matrix[,1], y, cex = .8, pch = 20, xlab = "Standardized Mean Differences", col = "darkblue",   main = "Balance Assessment", yaxt = "n")
  points(matrix[,2], y, cex = .8, pch = 20, col ="cyan")
  abline(v = 0, col = "gray50", lty =2)   
  text(y =1:6, par("usr")[1], labels = c("Var1", "Var2", "Var3", "Var4", "Var5", "Var6"), pos = 2, xpd = TRUE, srt = 0, cex = .8, font = 1, col = "blue")
  </code></pre>
  
  <p>It's minor, but it's driving me crazy. Thanks!<img src="https://i.stack.imgur.com/Rfx7r.png" alt="Plot Below"></p>