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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.

2
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1answer
31 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 ...
0
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3answers
132 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 ...
0
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0answers
21 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 ...
0
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1answer
46 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 ...
1
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2answers
51 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 ...
0
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1answer
25 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: ...
0
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1answer
104 views

How to interpret a boxplot to check for assumptions?

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 ...
0
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0answers
17 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 ...
0
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1answer
87 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: ...
1
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2answers
133 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 ...
0
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0answers
67 views

Germination statistics

To start, I have to apologize for my lack of knowledge in statistics. I have stumbled on to the problem that I find hard to solve on my own. I conducted the experiment where I placed bunch of seeds ...
18
votes
1answer
561 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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0answers
18 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 ...
0
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1answer
36 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 ...
0
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2answers
27 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.
3
votes
1answer
221 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 ...
1
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0answers
34 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 ...
2
votes
1answer
784 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 ...
1
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0answers
64 views

What are considered as outliers

I am using this function to see, if I have outliers. ...
1
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1answer
24 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., ...
0
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0answers
952 views

Histograms and box-plot match

Can you please explain why they match? I am really confused about the uniform distribution.
1
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0answers
99 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, ...
1
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1answer
57 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 ...
1
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1answer
112 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 ...
2
votes
1answer
893 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 ...
1
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0answers
149 views

ANOVA ASSUMPTIONS, LOW or NONE VARIANCE IN PART OF DATA

It was said to me there is a problem here, cause there is no variance of the control and ulex treatment - it can be the nature of the data or it can be the assumptions to apply anova in these data ...
9
votes
4answers
1k views

Why doesn't the fact that 1 median is lower than another median, mean that most in group 1 are less than most in group 2?

I believed that the boxplots below could be interpreted as "most men are faster than most women" (in this dataset), primarily because the median men's time was lower than the median women's time. But ...
1
vote
1answer
5k views

ANOVA - Homogeneous variance, what to look for in a boxplot

I'm just starting out learning about ANOVA, I'm having trouble understanding how to check for homogeneous variance assumptions. One source I have seems to be looking at box-plots, and another looks at ...
6
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1answer
2k views

Understanding and Interpreting letter value boxplots

I have read through the R documentation of lvplots, but it didn't provide enough material on how I would interpret these plots. I want to just have an intuitive ...
0
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1answer
192 views

Outliers in boxplots

I have a set of area measurements for objects in different groups (e.g., cities), and I want to provide a visual summary of them. While Quartiles and medians are quite interpretable, I'm trying to use ...
1
vote
1answer
56 views

How can I compare two variables when one has lots of zeros?

Specifically, I want to understand the contributions to insurance premiums and claims. In this case, everyone pays a premium, but only some people make claims. I want to understand whether the ...
0
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0answers
160 views

Relationship between the length of the whiskers and the tails of a population in boxplot

Why in the boxplots long whiskers are associated with a heavy tailed distribution and short whiskers are associated with light tailed distributions populations?
4
votes
1answer
1k views

How are whiskers in a Boxplot of different lengths? [duplicate]

The formula for calculating the position of the whiskers is Q3+1.5IQR and Q1-1.5IQR But doesn't that mean that the length of the whiskers should be of the same length? How are they of different ...
1
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1answer
1k views

What exactly does a Boxplot show? [duplicate]

Having a Boxplot like the following, how do I read it?
1
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1answer
98 views

Exploratory data analysis techniques to percentage variable

I'm running an analysis about a dataset with three variables: Income, number of residents per residence and percentage of income spent on rent (response variable). What descriptive statistics should I ...
4
votes
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 ...
8
votes
1answer
866 views

box plot in R: Do the outliers count when the quantiles are being determined?

I have a 1 dimensional dataset and I use the boxplot function to make a box plot. Then I can see that I have some outliers. Do the outliers count when the ...
1
vote
1answer
197 views

Boxplot for 2 distributions with different number of data in each

I had 2 different sets of data which I wanted to compare using a boxplot. However the number of samples / entries I have for each of the 2 types differ. Should I just create a boxplot for both of ...
10
votes
2answers
7k 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 ...
17
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4answers
1k 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 ...
0
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1answer
208 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 ...
0
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0answers
124 views

Misleading results with Kruskal-Wallis + Posthoc Test

Dataset: Rows are cross validation sets and columns are different regression methods. The dataset contains RMS error values on a benchmark regression problem. So, lower is better. Here is a boxplot ...
-2
votes
1answer
287 views

Does this box plot indicate that an extreme value exists?

This is the boxplot of the data. Did Extreme Value occur in this data?
5
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1answer
1k 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 ...
2
votes
1answer
136 views

Plot type or data transformation to visualize datasets with very high dispersion

I want to plot two datasets with the number of times an event happens within a month, based on a variable (changed/unchanged). The number of occurrences vary from 0 to 775,963. Many values (about 25% ...
1
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2answers
236 views

Boxplot using absolute frequencies

I have a dataframe in the following form: ...
1
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3answers
140 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.
1
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1answer
60 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 ...
0
votes
1answer
213 views

Box and whiskers plot and outliers [duplicate]

Why are data that are one and a half times the interquartile range (1.5IQR) or more, measured from the first and third quartiles, classed as outliers. Why 1.5?
4
votes
1answer
2k views

Violin plot or bean plot? What are the advantages of each?

I would like to represent my data in the most informative way. As successors of the boxplot, I have found violin plots as well as beanplots. What are the advantages of each plot? A violin plot could ...