Jim
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 1h comment Applications of mean and standard deviation The issue is that my data do not form a line. They are scattered and the graph would be with highs and lows. My intention was to find if in this graph we are starting to see a fast downward trend (i.e. some kind of downward spike) towards the end of the graph. Hence I was considering standard deviation. So my set of numbers represent the graph completely and the graph is not a line 2h comment Applications of mean and standard deviation Are you talking about en.wikipedia.org/wiki/…? 2h comment Applications of mean and standard deviation @callculus:These are random numbers representing events. The next could be anything yes 2h comment Applications of mean and standard deviation @callculus:I am interested in figuring out if a set of numbers is having a negative trend and I was thinking that the variance would show us if the numbers get more diverse towards extremes. Also my numbers are non-negative decimal numbers (0 included) 2h asked Applications of mean and standard deviation Apr 26 comment Can I treat latitude/longitude as (x,y) coordinates to find closest point? Is there a way I can do better than the brute force? I was hoping that somehow I could apply the planar case Apr 26 comment Can I treat latitude/longitude as (x,y) coordinates to find closest point? @mathreadler:Is there a way I can do better than the brute force? I was hoping that somehow I could apply the planar case Apr 26 asked Can I treat latitude/longitude as (x,y) coordinates to find closest point? Mar 11 comment How is the chart created if we only know that we divide into equal intervals? Could you please elaborate more? Mar 11 comment How is the chart created if we only know that we divide into equal intervals? You mean each bar has width 1.25? Mar 11 comment How is the chart created if we only know that we divide into equal intervals? What do you mean by the 2.25% ? Mar 11 revised How is the chart created if we only know that we divide into equal intervals? deleted 9 characters in body Mar 11 comment How is the chart created if we only know that we divide into equal intervals? The number of years is 70. But it says 1(1/4) i.e. 1.25. Mar 11 asked How is the chart created if we only know that we divide into equal intervals? Feb 5 comment Book on foundational reasoning of standard arithmetics “curriculum” One last question. Why e,g in this thread they seem to suggest that PM is extremely difficult to read even for professionals? math.stackexchange.com/questions/813119/… Feb 5 comment Book on foundational reasoning of standard arithmetics “curriculum” My intent was that I am interested in a book with specific focus so that it is "practical" and not something that covers pages over philosophical notions that covers things about all aspects of mathematics. Does that make sense? Feb 5 comment Book on foundational reasoning of standard arithmetics “curriculum” I'll start that book (along with the others mentioned). Concerning you I don't know what you are looking for, in case it helps: My interest was in a book that covers the basic arithmetics that we fundamentally use every day (logarithms, ratios, series, fractions, basic operations) but instead of just the formulas (which we all know by heart) an intuitive reasoning. When I meant not too much formal, perhaps I used the wrong term. Feb 5 comment Book on foundational reasoning of standard arithmetics “curriculum” To be honest I don't understand what you are trying to convey with your answer. You seem to suggest that my question is pointless since there is a school that supports that logic and math are separated. I assume you are suggesting to read Principia Mathematica but what background does this book require? Can a muddleheaded person readily read it? Feb 4 comment Book on foundational reasoning of standard arithmetics “curriculum” What do you mean that the foundation of mathematics do not lie in logic? Don't we use logic rules to form proofs? Feb 3 comment Book on foundational reasoning of standard arithmetics “curriculum” I am interested more in topics like: logarithms, ratios, series, fractions, basic operations i.e. all the basic topics of classic arithmetic. When I mean less formality I mean that I would prefer to not be too abstract in a way that is not practical. If something exists that is good but is formal I am fine with that if there is nothing else.