<p><strong>Nali, I do owe you an apology.</strong>  The proper way to proceed when I encountered a flag on your first post was to (1) recognize that you are a relative newcomer and welcome you to our site and (2) add a comment explaining why your post had to be deleted.  I could plead extenuating circumstances, but that would just be an excuse.  I am sorry about the misunderstandings that arose.</p>

<p><strong>This site warmly welcomes constructive, collegial debate about the correctness of answers.</strong>  We do everything we can to support this, such as providing people the ability to change others' posts, to comment on posts, and to add their own answers.  One aspect that takes some time to appreciate is the relative status of <em>posts</em> compared to <em>comments.</em>  A post--that is, a question or answer--has first class status.  It will be as permanent as anything can be; the history of its edits is maintained and can be reviewed; it can be voted up and down.  A comment has secondary status: comments could disappear at any time, can be changed only during a short period of time, and cannot be voted down.  If you are convinced that some answer to a question is wrong, then please consider formulating a better answer and posting that.  Just make sure you answer the question and do not respond solely to the other answer.  (We don't make that rule: it is how all SE sites work.)</p>

<p>As far as your second concern about "copying" goes, please recognize that <strong>any answer not only has to be correct to be of any value: it also has to <em>communicate.</em></strong> When two people post the same numerical answer to a question but one explanation is difficult (or impossible) to understand and another gets right to the point with a clear explanation, then it is much more valuable.  Thus we all strive to be not only right, but also to be <em>understood</em>. This is especially the case with statistical questions, because <em>statistics is not mathematics</em>. (And even in mathematics, clear communication is valued.)  Many questions permit multiple interpretations and may have differing correct answers.  For these reasons we welcome multiple answers to questions and sometimes those answers can look superficially similar.</p>
