Hi Ann, Nothing should have changed in our release during the time period that you mentioned, and more so, nothing has changed in the Histogram recently. Not to mention that the Histogram algorithm should be deterministic.
It would be extremely helpful if you would at least share the browser and operating system that you're seeing the issue on, since different browsers may behave differently (although this is not expected), but it would be more valuable if you could share your data as well, since that might be a contributing factor. My attempts to reproduce this issue have thus far been unsuccessful. To test the issue, I created a jsfiddle that redraws a Histogram chart indefinitely and counts the number of instances that were rendered inconsistently (judging by the bounding boxes of the bars). I ran this fiddle on both Chrome and Firefox, and was unable to find any outliers (inconsistently rendered charts) after over 3000 renders. You can find my jsfiddle at http://jsfiddle.net/m461pdcc/ , and it should be fairly straightforward to substitute your own data. On Thu, Oct 15, 2015 at 11:26 AM <[email protected]> wrote: > > <https://lh3.googleusercontent.com/-3IQ9TKd3V-I/Vh_ETMeWlmI/AAAAAAAAAAM/Ma5BkujOXBc/s1600/image%2B%252816%2529.png> > <https://lh3.googleusercontent.com/-yPMuR0pl_qE/Vh_Es3orF5I/AAAAAAAAAAU/qG5SYAnjnOY/s1600/image%2B%252818%2529.png> > I am having issues with inconsistencies in histograms. I am trying to > plot student test result data (test scores ranging from 0.2 to 1.0). > Sometimes, it puts the value 1.0 in a bin to the right (1.0-1.1). Other > times, it groups the value 1.0 in the bin to the left (0.9-1.0). I have > checked the outlier settings and am setting my own bin size (0.1), and I > have changed nothing else to my knowledge. Even within the same > spreadsheet it will choose to graph these data different ways. In the > example above, "Pd 3 Measurement Quiz," one student scored 1.0 on the quiz, > so that is shown in the 1.00-1.10 bin. In "Pd 3 Measurement Quiz 2," two > students scored between 0.9-1.0, and three students scored 1.0, yet they > are all placed in the same bin. The data came from the same spreadsheet. > I have not had this issue until yesterday, and I have made hundreds of > histograms. > > Any thoughts on this? Thanks! > > -- > You received this message because you are subscribed to the Google Groups > "Google Visualization API" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to > [email protected]. > Visit this group at > http://groups.google.com/group/google-visualization-api. > To view this discussion on the web visit > https://groups.google.com/d/msgid/google-visualization-api/55de9026-b4b8-4e88-bbef-6297f418aff8%40googlegroups.com > <https://groups.google.com/d/msgid/google-visualization-api/55de9026-b4b8-4e88-bbef-6297f418aff8%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Google Visualization API" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-visualization-api. To view this discussion on the web visit https://groups.google.com/d/msgid/google-visualization-api/CAEwwup6Od1t16_U%3DX7RiMwL%2BF6VzMZnEYCVnvb-fgMo3BzEntA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
