59 questions linked to/from How to interpret a QQ plot
4k views

### Understanding a Quantile-Quantile Plot [duplicate]

I must have generated at least 5 Q-Q plots until now when trying to fit my data into a known distribution but I just noticed something that I could not understand. In the figure shown below, from what ...
3k views

### How would you judge this qq plot? Distributional assumptions? Outliers? [duplicate]

Looking for some help. Here's my qq plot. I already deleted the most extreme outliers, but some remain. Also, what about the distributional assumption?
3k views

### How do I know what side is skewed? [duplicate]

If I look at a quantile plot comparing normal distribution and other data, and some of the points lie below or above the line, how do I know what that represents? What I am asking is - how do I know ...
2k views

### Interpretation of qq plot and normality [duplicate]

I am doing some multivariate regression. When I plot QQnorms to check my model assumptions (errors normally distributed), I get Question: How do you interpret the above? Are the normality assumptions ...
519 views

### Good explanation of the QQ-plot algorithm? [duplicate]

Anyone know a good explanation of the QQ-plot algorithm? http://www.biostat.au.dk/teaching/basicbiostat/F2014/qq-plot.pdf, p.2. has the only one I've found and it's a bit unclear to me (particularly ...
470 views

### Understanding output of qqPlot in R [duplicate]

I was trying to understand qqPlot and found that for finding Normal Distribution of data , qqPlot is a good tool. Then I ran 2 set of examples and got the following output where in both the case, all ...
320 views

### What does this QQplot tell us? [duplicate]

For a multivariate data set, I test normality on the marginals, and I get plots like above. That's not my actual plot.... mine is not that obvious, the middle part is actually quite straight.... but ...
190 views

### Does this normal distribution plot show a good fit? [duplicate]

I am not well acquainted enough to judge this well. This plot was obtained from normplot in Matlab. There is a good linear fit although the tails are concerning. Does my data follow a normal ...
124 views

### Normal QQ-plot interpretation [duplicate]

I seek help interpreting this qqplot. Am I correct that data points near the mean are reasonably normal, but data points away from the mean tend to be too far off, therefore the data is fat-tailed? ...
81 views

### QQ Plot Interpretaion [duplicate]

I have a daily time series and when trying to check for normality I am getting the QQ plot below. Any ideas as to what is the plot saying about my data?
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### QQ-Plot interpretation [duplicate]

I am working with a dataset (900 observations) and have the following normal QQ plot in R: Seeing that the QQ-plot little bit strange, what could I infer about the underlying distribution? It seems ...
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### How to interpert a qq plot [duplicate]

I'm a little confused about how to interpert this qq plot. The huge gap between the values makes me think it's not the best normal distribution, but i'm not sure how to draw a good conclusion out of ...
80k views

### Interpreting plot.lm()

I had a question about interpreting the graphs generated by plot(lm) in R. I was wondering if you guys could tell me how to interpret the scale-location and leverage-residual plots? Any comments ...
Is there a Box-Cox like transformation for independent variables? That is, a transformation that optimizes the $x$ variable so that the y~f(x) will make a more ...