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.

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1answer
77 views

Should I compare the median or mean for my data?

I have a data frame in R that contains the information about 252 freshman university students. ...
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1answer
13 views

How to deal with the categorical variables with few data for prediction

The image below shows how the rating for the heating quality will affect sale price.The data is about apartments and it's properties. E.g Rooms, GarageSize, BasementSize, etc. This visualization will ...
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3answers
376 views

Boxplot with whiskers close to zero

I've made box and whisker plots of how fish prices vary in a rural African market (as a way of detecting change in food security). My data are skewed to the left-and so my lower whiskers are right at ...
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1answer
82 views

boxplot in R shows wrong outliers

Can someone explain why does boxplot in R show me outliers when they are actually not? I have a dataset for computer sales and I have to predict the price based ...
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1answer
222 views

How to check the assumptions of ANOVA from a boxplot?

This boxplot shows 5 different forms of dancing. On the y-axis we have the number of injuries. This is an ANOVA model. The question is, what assumptions could not be met according to this boxplot? I ...
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2answers
3k 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 ...
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1answer
409 views

Visualizing many left-skewed distributions

I have a series of left-skewed/heavy tailed distributions that I would like to show. There are 42 distributions across three factors (labeled as A, ...
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1answer
24 views

I have two groups of data with (the same) two variables each, how can I plot these groups against eachother?

Please bare with me, I am very new to statistics. I have two data groups (Location A and Location B), at both locations I recorded two variables (Noise and Activity), I am trying to find out how I ...
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1answer
41 views

Displaying high dimensional box plots

If several box plots are to be displayed on a graphic where the X-axis represents a unique level, but one which is continuous (like per-year over a very long study) is there a well known way to ...
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3answers
571 views

Ways of visually comparing variance of data [closed]

I have a dataset containing 8 categories, I now want to visually compare the variance between the categories. The most common approach would be to use box plots or violin plots but I would like to ...
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1answer
254 views

Mathematical approach for finding baseline shifts in data

I have a raw signal from a sensor which is attached in this question . The x-axis is time, and the y-axis is the signal response. As you can see from the data, the baseline of the noisy signal shifts ...
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1answer
7k views

What is a 'bagplot', or 'bivariate boxplot'?

I've found a paper which introduces the multidimensional (bivariate here) version of the boxplot - a bagplot. What is that bagplot exactly? I can see the series of nested polygons based on vertices, ...
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0answers
23 views

Is it possible to experimentally reproduce the probability of type 1 errors in significance tests?

In some fields, a lot of sample studies feature statistical tests. Oftentimes, box plots of sample distributions are shown. I was wondering whether i could read distributional parameters from these ...
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3answers
181 views

Alternative to boxplots that illustrate MEAN

What is a good alternative to boxplots that reflects the MEAN and STANDARD ERROR , not the median and its quartiles ? A package in R that does that would help a lot.
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9k views

Is there a boxplot variant for Poisson distributed data?

I'd like to know if there is a boxplot variant adapted to Poisson distributed data (or possibly other distributions)? With a Gaussian distribution, whiskers placed at L = Q1 - 1.5 IQR and U = Q3 + 1....
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1answer
74 views

Biostats two way anova in R boxplot visualisation

I am having a problem analyzing some data from a recent experiment in R. The experiment was balanced with 5 replicates in each group. It included two factors (plant type and leaf age) with 15 ...
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2answers
6k views

Wondering what this bean plot analysis chart means

How does one interpret and generate bean plot charts. Here is one example taken from Walkes et al. 2010. What kind of data is it most useful for? (source: biomedcentral.com)
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2answers
1k views

Why do means appear outside the boxplot?

I have plotted the boxplots of the distributions of certain groups and I was bewildered to see that the means appear outside the boxplots. How could this be explained? Since boxplots are a ...
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1answer
7k views

Negative inner fence. How can you find the outlier using 1.5 x IQR?

I'm trying to find outliers using 1.5 x interquartile range but I'm getting a negative value for the lower bound. I found Q3 and Q1 which are 13.30 & 3.00 respectively but for the lower bound i ...
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2answers
66 views

Interpreting percentage of an outlier in a box plot

I have a dataset of 21 points. Below is a box plot of that data. I am trying to interpret this boxplot. Is it safe to say that 96% of my data points fall under 48? I derived 96% by dividing 100 with ...
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1answer
51 views

Is it reasonable to display “percentage data” in a boxplot, why?

I have data that are in fact percentages of C (bound to clay) combusted in a certain temperature interval. Exemplary data: ...
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7answers
19k views

What are some alternatives to a boxplot?

I am working on creating a website, which displays the census data for a user selected Polygons & would like to graphically show the distribution of various parameters (one graph per parameter). ...
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1answer
2k views

Boxplot for data with a large number of zero values

Is there a recommended way to illustrate a heavily skewed distribution using a boxplot? For example, my boxplot looks like so: It's very difficult to know what the median value is for the green ...
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0answers
28 views

How can I plot fixed and random effect in a boxplot?

In case a random effect has influence on the weight of outcome variable how would I plot the corrected values? I'm not sure if "variables getting weighted by the random effect" is something that is ...
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2answers
8k views

Reading box-and-whisker plots: possible to glean significant differences between groups?

Suppose we're looking at this box-and-whisker plot: Between Thursday and Friday, I think most would agree there seems to be a significant difference in time slept. Is that a statistically-valid ...
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1answer
124 views

How can this boxplot be transformed suitably?

In R, I have produced a boxplot for two different groups, with discrete y-values between 1 and 20. My goal from this work is to investigate whether the average count differs between A and B: ...
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2answers
314 views

Boxplot only display points

I have a rather mysterious problem when I try to do a simple boxplot with boxplot(data$sex,data$freq) but I'm unable to display box plot, and I cannot figure out ...
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4answers
2k views

What is the basis for the Box and Whisker Plot definition of an outlier?

The standard definition of an outlier for a Box and Whisker plot is points outside of the range $\left\{Q1-1.5IQR,Q3+1.5IQR\right\}$, where $IQR= Q3-Q1$ and $Q1$ is the first quartile and $Q3$ is the ...
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1answer
2k views

Pairwise comparisons for a regression with sandwich estimates (in R)

The question in short I run a regression in R and made a boxplot of the response variable with grouping by one of the predictor variables. On this boxplot I'd like to add some information about the ...
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4answers
20k 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 ...
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1answer
704 views

What's the history of box plots, and how did the “box and whiskers” design evolve?

Many sources date the classic "box plot" design to John Tukey and his "schematic plot" of 1970. The design seems to have stayed relatively static since then, with Edward Tufte's cut-down version of ...
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2answers
11k views

Box-and-Whisker Plot for Multimodal Distribution

Can I use box-and-whisker plots also for multimodal distribution or only for unimodal distribution?
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0answers
70 views

Combining Box Plot with frequency count [duplicate]

Are there graphing techniques (certain kinds of plots) that are similar to the Edward Tufte's box plots - shown below - but that consider the distribution of the data points? But instead of a black ...
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0answers
35 views

What information can be gained from the the density or the distribution of outliers in box plots?

Hi everyone, I am using box plots to show my results for the simulated energy consumptions. However, the distributions of the outliers for the months May and June are weird to me. Specially ...
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28 views

Create a probability distribution using boxplot information

How do you fit/estimate a probability distribution using only the information from boxplot, i.e, max, min, 1st quartile, 3rd quartile and median? I don't have access to raw data but only a boxplot ...
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1answer
44 views

box plot analysis.

I have been asked to comment on what I observe and I am unsure of what to say about not having 1 quartile for race 1, not having a lower whisker for race 2, and not having 1 quartile for race 3. I ...
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2answers
28 views

Can you let me know how you would analyze/compare this 2 box plots?

I am unsure of what these 2 box plots are telling me about the distribution of the data and how the are different. Any information will be appreciated.
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2answers
1k views

Assumptions of Mann-Whitney U-test

I have 2 samples, which I got by conducting a 5-point Likert scale survey. I have 9 results for group A and 17 results for group B for 12 variables. I would like to test now if the groups differ ...
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1answer
1k views

How to deal when you have too many outliers?

I have attached the boxplot of a variable called Fare(of a journey). This is a continuous variable which has outliers. According to some articles on outliers, I learned that any data point that is ...
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1answer
492 views

Qualitative difference between boxplots and error bars (descriptive vs inferrential statistics?)

Assume I have test scores from several groups, with all samples of equal size. Assume I want to plot this data so as to emphasise in the simplest way (without showing the distributions) the difference ...
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1answer
1k views

Outlier detection for skewed data

I have a dataset as below: 4.8856 4.8914 4.9125 4.9338 4.9563 4.993 4.9947 4.9947 4.995 5.2932 4.981 4.981 4.981 4.982 4.982 4.982 4.982 4.983 4.983 4.984 4.984 ...
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0answers
66 views

What are considered as outliers

I am using this function to see, if I have outliers. ...
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7answers
13k views

Plotting confidence interval bars from summary statistics

A bit like a box plot. I mean not necessarily the standard upper confidence interval, lower confidence interval, mean, and data range-showing box plots, but I mean like a box plot with just the three ...
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1answer
28 views

Simplify the data in a boxplot

I'm a web developer and currently working on visualizing the execution time of processing a request. Thus, I can create a list with all execution times (e.g., ...
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0answers
161 views

SPSS P-value for box plots?

I got some groups to compare. My variabels are in the physical fitness area so BMI, bodyfat etc... I have 4 groups, categorized in gender and two school classes from 2010 and 2012 (Men2010 Men2011, ...
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1answer
65 views

ideas for presenting data from multiple conditions

I have some data from an experiment that has 7 variables that have two levels to generate the conditions for the experiment. Consequently there are 128 (2^7) different combinations of variables. I've ...
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4answers
42k views

Labeling boxplots in R

I need to build a boxplot without any axes and add it to the current plot (ROC curve), but I need to add more text information to the boxplot: the labels for min and max. Current line of code is below ...
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2answers
4k views

statsmodels: error in kde on a list of repeated values

I am using Python's statsmodels module to plot a violin/bean plot of some data. I get the error "LinAlgError: singular matrix" in the KDE calculation whenever a single violin plot is drawn from a list ...
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1answer
126 views

Help needed with my box plot

I decided to give box and whiskers plots a try with my data. However, the produced box plots look a bit abnormal. I have not been able to find such cases online. For example, my "T" value has no box ...
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1answer
61 views

What kind of graph is this?

I came across the following graph in a report where the authors report the results of a Monte Carlo simulation study in terms of proportions. I have never seen such kind of plots before. Does anyone ...