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.

Filter by
Sorted by
Tagged with
5
votes
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 ...
7
votes
2answers
546 views

Missing quartile in boxplot

Currently I am creating a box plot. I am new on the field of statistics and especially box plots. Find the picture following: On the y-axis find the number of messages. I have problems understanding ...
1
vote
0answers
16 views

Plotting series of numbers while protecting privacy

I have 2 series of numbers e.g x=[1,3,4,6,9] y=[100,179,210,400,650]. I want to plot them and show that plot in a manuscript. However, these numbers represent some private information and hence I don'...
10
votes
1answer
423 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, ...
0
votes
0answers
14 views

Correlation with Pearson possible for Continous - Dummy Variable? Otherwise options?

I assume that I cannot interpret correlation coefficients given by Pearson method for continous - dummy variables. Is this correct? Which options can I pursue otherwise? Its for the decriptive ...
0
votes
0answers
15 views

How to define a threshold based on box-plot

I have a set of ordered number list as follows. 25789, 20500, 18888, 15000, 13200, ...., 118, 8, 1, 0 In my dataset most of the values are in the range of (1000-...
2
votes
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 ...
1
vote
1answer
79 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. ...
1
vote
1answer
20 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 ...
2
votes
3answers
396 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 ...
1
vote
1answer
140 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 ...
2
votes
1answer
257 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 ...
7
votes
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 ...
1
vote
1answer
25 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 ...
3
votes
1answer
42 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
votes
3answers
697 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
votes
1answer
280 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 ...
11
votes
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, ...
0
votes
0answers
24 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 ...
1
vote
3answers
200 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.
33
votes
2answers
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....
0
votes
1answer
103 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 ...
11
votes
2answers
7k 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)
4
votes
2answers
2k 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 ...
4
votes
1answer
8k 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 ...
1
vote
2answers
82 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
votes
1answer
80 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: ...
19
votes
7answers
20k 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). ...
0
votes
0answers
33 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 ...
11
votes
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 ...
0
votes
1answer
153 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
vote
2answers
371 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 ...
17
votes
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 ...
6
votes
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 ...
13
votes
4answers
22k 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 ...
19
votes
1answer
780 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 ...
13
votes
2answers
12k views

Box-and-Whisker Plot for Multimodal Distribution

Can I use box-and-whisker plots also for multimodal distribution or only for unimodal distribution?
0
votes
0answers
85 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 ...
1
vote
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 ...
0
votes
0answers
43 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
votes
1answer
48 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
votes
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.
4
votes
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 ...
3
votes
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 ...
3
votes
1answer
683 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
vote
0answers
67 views

What are considered as outliers

I am using this function to see, if I have outliers. ...
8
votes
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 ...
1
vote
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., ...
1
vote
0answers
193 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, ...