Post Reply 
Normal Probabilty Plot
02-02-2017, 10:25 PM
Post: #6
RE: Normal Probabilty Plot
I prefer the data axis to be Y when this plot is used alongside another plot such as a histogram or a box and whiskers plot. (I teach statistics for JMP. I am a SAS Institute instructor.) It doesn't matter much to me in HP Prime because you only see one plot at a time as long as it it labeled.
I think that a reference line is helpful for the interpretation and use of the plot. When the data are the Y, then the line has a slope equal to the standard deviation and a Y intercept equal to the mean. This form is useful in a one-way ANOVA to have over-laid normal quantile plots for each group. If the lines are offset vertically then the groups have different means. If the lines are not parallel Jen they have different standard deviations.
It is a simple graphic that adds much to the usefulness of the visual display of the data.
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
Normal Probabilty Plot - KeithB - 02-01-2017, 05:30 PM
RE: Normal Probabilty Plot - Tim Wessman - 02-01-2017, 05:53 PM
RE: Normal Probabilty Plot - KeithB - 02-01-2017, 07:41 PM
RE: Normal Probabilty Plot - grsbanks - 02-02-2017, 08:23 AM
RE: Normal Probabilty Plot - KeithB - 02-02-2017, 04:32 PM
RE: Normal Probabilty Plot - mark4flies - 02-02-2017 10:25 PM
RE: Normal Probabilty Plot - mark4flies - 02-02-2017, 10:29 PM



User(s) browsing this thread: 1 Guest(s)