title: How to know if my data follow two parameters or three parameters lognormal distribution in R
body: <p>Please I need help. I am working on dilution of pollutants and I have carried out experiment and obtained my data as in the code below;</p>
  <pre><code>set.seed(123)
  sample1 = runif(1500, 0.14,0.26)
  sample2 = runif(1500, 0.14,0.26)
  sample3 = runif(1500, 0.14,0.26)
  sample4 = runif(1500, 0.14,0.26)
  sample = data.frame(sample1,sample2,sample3,sample4)
  sample_product = sample$sample1*sample$sample2*sample$sample3*sample$sample4
  Sample = cbind(sample,sample_product)
  c4 = Sample$sample_product*360.5
  Data = cbind(Sample,c4)
  </code></pre>
  <p>Now, I want to know if c4 follow a two parameters lognormal distribution or a three parameters lognormal distribution. I have searched online and all what I got is how to obtain the estimate of the parameters. Your help will be highly appreciated. Thank you</p>