# Tagged Questions

A graphical display to summarize the distribution of a sample. It displays five numbers plus (possibly) some outliers - those five points being the median, hinges (approximate quartiles), and the largest and smallest value not counting any points marked as outliers.

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### Measuring performance with histogram

We are measuring weekly staff performance, so that management can make informed decisions about task assignment. [1] To the end we have measured performance as follows: Workers are assigned batches ...
51 views

### Interpret box plot when no mean is shown

I am trying to understand what is shown in the following boxplot given the information from the Wikipedia article on the box plot. The problem is that we see no mean, and only whiskers in one ...
35 views

### How to show association between categorical variables with graphs?

I have 4 categorical variables in a dataset let $X_1$, $X_2$, $X_3$ and $Y$. Where $X_1$,$X_2$ and $Y$ is a binary random variable and $X_3$ have 3 categories. How can I study the association of $X_1$...
38 views

### How to interpret whiskers of a box plot when there are outliers?

When I look at the definition of box plots, the whiskers are said to indicate the extreme values. So, if I look at height in a sample of people, the lower whisker should denote the height of the ...
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### Boxplot for detecting outliers… does it make sense?

At the moment I'm writing my master thesis. For that, I need to do some statistics based on my data, which I received from my study. In my thesis, I would like to analyze 4 different visualization ...
36 views

### Boxplot Outliers

I'm looking for outliers in a non-normally distributed dataset: n: 1,900 Mean: 2,738 StDev: 1,544 Min: 1 Max: 22,102 Anderson-darling: 40 P < 0.005 The boxplot shows the outliers in one ...
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### Can I use a violin plot to visualize logistic regression results (predicted probabilities)?

I have a simple study in which I predicted the likelihood of an outcome as a function of a two-level grouping variable. Now I'd like to display these results in a graph. Initially I was thinking of ...
39 views

### Robust statistic for representing small dataset with outliers and representing them graphically

I'm evaluating different systems varying a certain parameter common to all of them. Let this parameter be x. At each x value I ...
51 views

### What statistical test allows comparison of the 3rd quartiles between groups?

I am using r and have ~400 observations divided into 3 groups. Group A contains 199 observations, while B contains 173 and C contains 24. I have generated a boxplot of their corresponding measures ...
237 views

### R: Box-plot on log scale vs. log-transforming *then* creating box-plot: Don't get same result

In the boxplot() function in R, there exists the log = argument for specifying whether or not an axis should be on the log scale....
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### Plotting errorbars adjusted for multiple comparisons

I have run a 1 way basic ANOVA on 4 categorical variables. Afterwards, I ran multiple comparisons on all 4 groups (6 comparisons) & adjusted using the Tukey-Kramer method. This was all done in ...
16 views

### Interpreting boxplots [duplicate]

I am trying to interpret the three boxplots below in light of another plot before finalizing my glmer models (GLMM) in R. The boxplots below show the relationship ...
39 views

### Time period length for comparing two Boxplots?

I want to see the variability in a dataset or timeseries in two different period by the means of Box and Whisker Plot My time series covers a period of 1901-2010. I want to see the variability post-...
405 views

### What information does a Box Plot provide that a Histogram does not?

Histograms give a good sense of the distribution of a variable. Box plots attempt to do the same thing however, don't give as good of a picture of the distribution of this variable. I don't ...
93 views

### QQplot vs BoxPlot

I am having trouble reading my qqplots. I want to asses normality graphically before I carry out a test like shaparo test(my sample is small (<50)) . So I have two question is the qqplot better ...
55 views

### Outlier detection in multivariate data

I have a table with thirty variables and am interested in finding the outliers (rows). Assuming that my variables are independent I am hesitant whether I should use Cook's distance as it requires to ...
70 views

### Boxplot interpretation

I'm taking an introductory online statistics class. Unfortunately not everything is clear to me from this class. One of the chapters in the book contains an example of a Box-and-Whisker interpretation,...
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### Are values equal to a lower boundary included as part of the whisker or as an outlier on a box and whisker plot?

If a value is equal to my lower boundary, do I include it as part of the whisker, or as an outlier, on a box and whisker plot?
162 views

### Minimum “recommended” sample size for boxplots? Boxplots for different sample sizes

What is the minimum "recommended" sample size to generate boxplots? If I'm comparing different methods and each method has a different sample size, is it fine to use boxplots for this comparison? If ...
75 views

### How does boxplot in R calculate quantiles?

Why 1st and 3rd quartiles don't match with boxplot in R? ...
147 views

### How to read a boxplot in R? [duplicate]

I read the boxplot docs, but didn't find the answer. When using the default settings (boxplot(x.ts)), what do the whiskers, boxes, midlines and outliers represent? ...
132 views

### Why is the 95% CI for the median supposed to be $±1.57*IQR/\sqrt{N}$?

In various sources (see e.g. here), the following formula is given for confidence interval for median (especially for the purpose of drawing notches on box-and-whisker plots):  95\%\ CI_{\rm median}...
429 views

### How to use boxplots to find the point where values are more likely to come from different conditions?

I have plotted some data using box plots. I am comparing Condition 1 (left) and Condition 2 (Right) values. My aim is to find a point at which we make a decision where the value changes from point ...
103 views

### How to check whether the relation between ordinal variable and scale variable is monotonic?

I am wondering what correlation measure to use for calculating the relation between ordinal and scale (interval) variable. For using Spearman's rho the relation must be monotonic. I created a ...
42 views

### Power transform before aggregating data: benefits and risks

I have several physiological recordings from different users, for example heart rate. I would like to aggregate these time-series into a single "metric". Let's say that I want to apply the mean ...
818 views

### How to display multiple variables in a boxplot with R [closed]

I am not very strong with R, and I am having some issues displaying a boxplot. I am not looking to use additional packages (such as ggplot) - I am trying to do this through just the R core. I have a ...
43 views

### Boxplot of standardized data matrix

I have boxplotted a standardized data matrix. It seems all fine and the boxplot looks good, but how can I interpret it? The values are very different from the non-standardized data matrix, so I can ...
69 views

### How to interpret box plots of 5 different distributions

I have created a box plot of the amount of tests a group of people took per day. (M-F). A box covers the range from mean-sd to mean+sd, and will show 15th-85th percentiles. The diamonds show the max ...
818 views

### What kind of chart is this?

Sorry for the vague question but this chart appears in Biddle et al. 2009 and I've not encountered anything like it before. It's a bar chart with beveled edges, sometimes 'horns'. What do these mean? ...
550 views

### T-test using only summary data in a box plot

I have the 5 number summary (min, Q1, Median, Q3, max) from two boxplots and wanted to test whether or not the averages of the groups in the two boxplots were significantly different. I would like ...
112 views

### Testing the difference between two samples with very different sizes using an un-paired t-test

I want to test wether population A is significantly different from population B (at 5% confidence interval). I need to do it for each variable using an un-paired t-test, since my data are normally ...
65 views

### How to add overall data to group by category chart in R? [closed]

i have a (ggplot) chart whit multiple data grouped by factor column. I also would like to add an "overall" group to it. Is there an easy way to do this? For example i want to extend this plot with a ...
39 views

### suitable statistics to replace box plot [closed]

I am applying few classification methods on a set of images. Currently, I have experimental results in box-plots and want some statistical method to report them in my dissertation. Problem ...
227 views

### How to compare the distributions of two variables

The attached figure plots the distributions of two variables. I want to demonstrate statistically how closely the the two distributions match each other. What is the best way of doing this?
98 views

### Exploratory data analysis using box plots

How should you make a box plot when the data have an outlier? Must we use the data with the outlier, or use the data without the outlier? If we use the data without the outlier, we will change the ...
97 views

### Outliers in Boxplots when calculating means

I have a dataset for which I am making boxplots. I do not want to include the outliers in the box plot so I give an argument outline=FALSE in the command. In the next step I want to put the mean ...
2k views

### Confused by location of fences in box-whisker plots

In one type of box-whisker plot, the fences at the ends of the whiskers are meant to indicate cutoff values beyond which any point would be considered an outlier. The standard definitions I've found ...
64 views

### Is there a name for this sort of plot? Is there any reason not to use it?

Suppose we have some time series data, with multiple samples per time unit. For example: ...
131 views

### how should i interpret boxplot and manova results simultaneously?

I have a data in which i am interested in how the response of photosynthesis and conductance varies differentially among different temperatures/ranks/crosses/genotypes. I have set up a manova to do ...
3k views

### Box-and-Whisker Plot for Multimodal Distribution

Can I use box-and-whisker plots also for multimodal distribution or only for unimodal distribution?
1k views

### Boxplots vs. Confidence Intervals

I designed a heuristic that solves a problem concerning network graphs. It was tested on thousands of different instances that have various different characteristics: Topology, template, number and ...
195 views

### What does a Barplot, a Boxplot and eCDF represent?

I want to understand what a barplot, boxplot, and eCDF represent when they are used for plotting data. A barplot is kind of intuitive, easy to understand what it represents. But I fail to understand ...
300 views

### Can I say that my samples are different just by looking at box plots without performing a test?

Is it possible to say that my samples are significantly different (or not) from each other just by looking a box plots? If yes, what do I have to look at and what is the theory behind it? I read ...
686 views

### JFreeChart Boxplot appearance

I'm need to create boxplots to analyse and evaluate test results. Since I program in Java this answer convinced me to use JFreeChart. The BoxAndWhisker chart seemed similar to what I wanted. I spent ...
4k views

### Why does Tableau's Box/Whisker plot show outliers automatically and how can I get rid of it?

I have a data set shown as box-whisker graphs after disaggregating. See below. I am wondering why Tableau (the product I am using) automatically plots a whole bunch of values outside the box-...
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### Is there any use of having dual error bars in bar charts to show both descriptive and inferential statistics?

I would like to display information both about the distribution of the population and the certainty in the measurements in the same plot. Would there be any use of having dual error bars in a barchart ...
1k views

### Box plot with just two values does not have its whiskers in R

Are boxplots by default unable to produce the whiskers when there are just 2 values being input? I am working with dataset rufi and the values input are ...
667 views

### What is “the shortest half of the data”?

Here is a histogram (realized with JMP) displaying two types of box plot called outlier box plot and quantile box plot. Right below, there are a bunch of explanations of the meaning of the ...