# Questions tagged [boxplot]

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.

213 questions
Filter by
Sorted by
Tagged with
28 views

### Box and Whisker plot - dots over the box

I have a box and whisker plot, and I am unable to understand the meaning of the dots over the box. In the following example, I understand that outliers are the data points which do not "fit" ...
17 views

### Creating box plots from a count (or frequency) table

I have a census data where the number of population at each age is indicated and I am trying to create a box plot for the age of the entire population. At first I tried to repeat the 'age' by the ...
54 views

### How to name and treat such a distribution of extreme values / outliers?

In this sample data I have 4600 teenagers with their telephone calling frequency per week. Most of them are "normal" (max 5) but some are extreme with up to 75 calls per week. I learned to ...
41 views

### What does the "mass" of a box plot mean?

By “mass” I mean the size of the two subretangles that make up the box in a standard box plot. I thought the mass quantified the observations below and above the median but if it did so every box plot ...
61 views

### why does ggplot show outliers but no whiskers?

I created the following plot in R (ggplot2). But I don't know how to interpret the third boxplot. From the documentation: 'The upper whisker extends from the hinge to the largest value no further than ...
58 views

### What does it mean if there are values outside the bounds of confidence interval?

My apologies if this is too basic, I am beginner in this. I have computed the following results where the highlighted region represents the rolling confidence interval using mean and standard ...
9 views

### kruskal-wallis and boxplots interpretation

This is an example. Let's say in my investigation I am collecting online text data. I have a software that automatically collects text according to specific categories. I have to select the best ...
12 views

### Maximum possible outliers for a Box-Whisker-Plot

I am aware of the definition for outliers in a Box-Whisker-Plot: 𝑞1−𝑘×IQR 𝑞3+𝑘×IQR with IQR := 𝑞3−𝑞1 The question at hand is: (Maximum) How many outliers are possible in a Box-Whisker-Plot for ...
84 views

### Alternative to boxplot when there are many outliers

I have a distribution than has an extremely wide range but has a gaussian shaped narrow peak inside of it. If I plot this data with boxplots I get a small box with small whiskers and many outliers of ...
58 views

### layman's interpretation of a boxplot

Is it wrong to conclude from the following boxplot that a passenger is more likely to experience flight delays on Thursdays and Fridays? If so, why? Note: negative delays mean early departure. Image ...
43 views

### Visualising Gantt chart distribution

I perform $n$ simulations of operations planning. I can plot a gantt chart for each simulation, but I am interested in visualising the variability of the whole simulation set : I want a Gantt ...
19 views

### Remove dependency from a dependent variable

I am tasked with doing some exploratory data analysis on the Diamond dataset from the library(Ecdat) in R. The assignment states:...
12 views

### How can I use Boxplots to find patterns in each box data?

I have represented my dataset in Boxplot 1 in order to check if there is patterns in meals consumption within each age group. What I can see, is that there is a kind of patterns in each age group, ...
44 views

### Alternative for boxplot with log-x scale

I am analyzing the behavior of a distribution with a logarithmic x-scale on a pretty large range. Initially, I thought using boxplots might be a good idea to understand how the data behaved, but now I ...
76 views

### How to plot a box plot that accounts for the effect of another factor?

I am analyzing the effect of sampling month (5 different months), sampling time (day/night) and sampling location (5 different sites) on the effect of species richness using a linear model in R. All ...
41 views

### Analyse relationship between categorical feature vs continuous target

In a regression problem, I am trying to analyse the relationship between categorical predictors vs continuous target variable, therefore I opted for plotting with a box plot, but can not infer ...
54 views

### Determining scale issues covariance

Background for Question A tibble: 6 x 4 This was given to us. I produced a bivariate/matrix scatterplot using pairs command and got the following (as well as a boxplot): QUESTION: Could scale be an ...
32 views

### p value for monthly trend

I have a distribution of values for each of 12 months. When I draw the boxplots (one boxplot for each month) the median gradually increases, but the boxes overlap. Which test do I have to use in order ...
73 views

### How do I report box-plots for k-fold data?

I'm working on a keypoint detection task and I am plotting a boxplot (25th-75th percentile = box) showing the error (i.e. distance) between the predicted keypoint and actual keypoint. I've gotten the ...
46 views

### Perform linear regression after box plot. Is that possible?

I am currently investigating a dataset with a visible linear relationship between the considered variable (Look at the red dots in the figure). However, the linear regression results are not good due ...
17 views

### 3d plot superstore data [duplicate]

How to make out of the below dataset a very meaningful/insightful 3D Plot. I mean, which variables you will pick up, plus, which 3D plot you will choose? Also, if you can add the same for the boxplot.
41 views

### negative skew and positive medcouple

I have below case where I see contradicting medcouple and skewness value : Now, from the box plot, it is clear that the data has negative skewness but the medcouple shows slight positive skewness. Am ...
113 views

### R: remove outliers from boxplot or qq-plot?

I am running a regression model, and I need to delete outliers. However, when I ran a boxplot, it asked me to delete at least 100 datas (I only have 700 datas in total). Both y and x variables are ...
119 views

### can somebody explain what a medcouple is?

what is a medcouple? i understand that it is the median of a couple of data points but it is not clear to me what these pairs of data actually are. e.g. https://wis.kuleuven.be/stat/robust/papers/2008/...
183 views

### How can I use the box plot to explain the Empirical Rule for a normal distribution?

I am wondering if I can use the box plot to explain the Empirical Rule for a normal.distribution. I don't know if the Empirical Rule can be explaines using the box plot or not, but I just looked at ...
28 views

### Boxplot giving only points and no boxes [closed]

I have plotted two boxplots side by side from two different datasets in the same plot. I made some transformations first they had different number of observations. ...
2k views

### What is the defintion of variation in a box plot?

Variation is a term I have always been confused with. The first time I heard it, it was defined as "the different between the max and min values in a distribution". Lately, I've been hearing ...
36 views

### What action to do after visualizing box plot of variables of a dataset

I have a dataset that contains 23 features, these features model the web traffic of two protocoles. Some features are extracted and the other are statistically calculated features. I want to build a ...
28 views

### determine the value of the mean using whisker plot

how can i determine the mean using box plot? also can we know which series has the highest mean value ?
3k views

### Figuring out skewness from a boxplot

How do you define the skewness in this case? My understanding is exactly the opposite from what I have read. What I have read As the box plot is towards the lower end it is rightly skewed. and it will ...
16 views

### How are notches calculated for boxplots that represent non-parametric data?

I was interested in finding the theory behind the formula used to calculate where notches are to be placed in a boxplot to signify 95% confidence interval, which is median +/- 1.57*IQR/sqrt(n). An ...
40 views

### Formal Statistical Test Equivalent to Comparing Box Plots

I have a data set consisting of a continuous feature compared to a discrete, categorical feature. Currently, I have generated a stacked box plot for each dependent category comparing the values of ...
73 views

### How to explain a Box Plot?

Assuming that I'm able to augment their knowledge about boxplot I can give the below insights for box plot ...
30 views

### arrows on whiskers of box plots

I plotted box plots for a dataset of >20 million rows. The whiskers came out with little arrows pointing towards the boxes: What do they mean?
699 views

### Significant effect with overlapping boxplots?

I'm puzzled about some of the results that I got, after plotting the data. I have a dataset where 38 participants are tested on three conditions "time" and are thus tested three times. I figured this ...
36 views

### Boxplot without top whisker

I'm having some questions and hope some one could help me with them. When I plot the data into a boxplot, there is no top whisker but lots of outliers which is above the upper bound. As I'm looking ...
451 views

### Tukey depth intuition

In a bagplot, the inner polygon, called the bag, is constructed using the Tukey depth. What is the intuition of Tukey depth and how is it calculated? A simple two-dimensional example with ten to ...
37 views

### Visually, how strong would you rate the association between this nominal predictor variable and continuous response variable?

I've yet to find an easy-to-understand and easy-to-implement way to statistically model the strength of association between nominal data and continuous data. So I'm trying to get a rough idea visually ...
46 views

### Repeated measures anova in R: comparing each month against itself across a ten year period

I am an R novice and trying to perform a repeated measures anova to compare each month against the same month across all 10 years (e.g. Jan 2010, Jan 2011, Jan 2012 and so on... for each month). And ...
106 views

### a box-and-whisker plot for the difference between two independent groups

I'm trying to plot a box-and-whisker plot for differences between samples obtained from two different (and presumably independent) groups (the sample numbers may differ between the groups). Because ...
124 views

### How to make inference based on a box-plot? [closed]

1) Write a comment about age comparing the box-plots at two levels of treatment compliance levels. 2) What are the interquartile ranges of BMI for comparing these two levels of treatment compliance ...
773 views

### Method to determine outliers with a skewed dataset [duplicate]

How can we find outliers in a dataset with a (highly) skewed distribution? With a normal distribution, is it well documented to use 2 x Standard Deviation or the upper boundary of the box plot (1.5 x ...
346 views

### How to visualize 10-fold cross-validation results?

I want to visually compare the 10-fold cross-validation results of two models. (Note that the data are paired, as both models are fit to the same folds and tested against the same held out fold on ...
576 views

### Problems with boxplots and many zeros

I am having a problem making box plots in R. I have several datasets which measure the vocalization of a species (in "Detection Positive Minutes", the number of times a cetacean was calling per hour) ...
79 views

### Interpreting a boxplot with outliers [closed]

I have this specific boxplot that I would like to interpret in my conclusion for my master thesis. I noticed that the most right box does not have any outliers, but a very broad Q2 and Q3 range. Also ...
414 views

### Interpretation of boxplot overlaps

Let's assume that I have the boxplot below that shows fraction of hits for a query. I'm trying to understand if there are any meaningful differences for each type (x,y) and for each category (A-D). ...
289 views

### Comparing boxplots with different sample size

Let's suppose somebody did an experimented to measure how high a plant can grow on different soils. The experiment has been repeated different times for the different soils, with some soils having e.g....
90 views

### Why do box-and-whisker plots use interquartile range, when it deliberately ignores everything below the 25% percentile and above the 75% percentile?

Why ought IQRs, and anything that relies on them like boxplots, be used when they ignore data? I replicated Wikipedia's graphs.