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 Oct 15 revised Finding the value which minimises all residuals cleared up the text Oct 14 asked Finding the value which minimises all residuals Sep 29 awarded Commentator Sep 29 comment Multiple variables with multiple solutions Hi Berci. Thanks for that idea too. I would love to add in another condition, but in this particular instance, I can't. Otherwise it might certainly make it easier to restrict the values of $x, y, z$. Sep 29 accepted Multiple variables with multiple solutions Sep 29 comment Multiple variables with multiple solutions Thanks for the further explanation. That makes sense now. Yes, $x, y, z \ge 0$. I guess rearranging the equation to solve for $x$ or $y$ would be tricky? Sep 29 comment Multiple variables with multiple solutions Thanks for that Alex. That makes a little sense, rearranging it like that. The part I'm unclear of is what I do with the $x, y,$ at the start? Are they just multiplied in? Plugging in values of $x=3, y=1$, how might it work? (sorry if this is a really basic question) Sep 29 asked Multiple variables with multiple solutions May 21 awarded Teacher May 21 accepted Finding two populations in a set of data May 21 answered Finding two populations in a set of data May 20 comment Determining the error from a list of individual errors I've clarified by question a little by removing "average error" as I don't think that's what I'm after exactly. What I need to work out is the error of the whole dataset when averaged. May 20 revised Determining the error from a list of individual errors deleted 2 characters in body; edited title May 19 comment Determining the error from a list of individual errors I understand how to get a standard mean error (stdev / sqrt(number-of-values), but I'm not sure I understand the average squared error you mentioned. How would I calculate that given my example? May 17 asked Determining the error from a list of individual errors Apr 26 comment Finding two populations in a set of data Thank you everyone for the info. Gottfried, I ended up finding a similar piece of software specifically suited to astronomy. Would it be worth posting the details here as an answer? What's the etiquette? Apr 21 comment Finding two populations in a set of data Thanks Gottfried. I did a search for that and found the software but it's only available on Linux and the Windows version only allows you to load their demo files. Apr 21 comment Finding two populations in a set of data Thanks again André. I can see visually the two populations are those greater than and less than -1. Is that all there is to it or is there a more mathematical way to determine the boundaries? Apr 21 awarded Editor Apr 21 comment Finding two populations in a set of data Thanks André. I have update my question slightly and redone the histogram to show the total number agains the value. Perhaps this is a better place to start from?