175 reputation
2212
bio website carljoseph.com.au
location Australia
age 38
visits member for 3 years, 5 months
seen Oct 17 at 0:10

Business Analyst, Furniture Builder, and Astronomer in Training.


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?
Apr
21
revised Finding two populations in a set of data
Changed graph, added table of data.
Apr
21
asked Finding two populations in a set of data