# 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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19 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 ...
8 views

### R language “double log”(?) y axis in plot? [migrated]

I have a bunch highly variable data, let's say: a <- runif(1000, min = 10^-9, max = 10^9) b <- runif(1000, min = 10^-9, max = 10^9) for which I do require to ...
37 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 ...
20 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?
16 views

### Boxplot on one one significant interaction of mixed effect model

I have a mixed effect model with two interactions statistically significant : one related to a continuous variable, the time of my experiment and one in relation to a categorical variable the day of ...
104 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 ...
14 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 ...
162 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 ...
30 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 ...
15 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 ...
21 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 ...
61 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 ...
9 views

### How to optimally visualize the distributions of integers from independent samples that share a feature?

Let's say there is a feature (or condition) that you can apply to a set of independent sets of numbers which makes independent subsets of those initial sets and you want to visualize the distributions ...
59 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 ...
85 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 ...
86 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) ...
68 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 ...
43 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). ...
52 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....
46 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.
872 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 ...
22 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'...
20 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 ...
93 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-...
93 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. ...
33 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 ...
470 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 ...
32 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 ...
57 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 ...
729 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 ...
25 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 ...
349 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 ...
222 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 ...
266 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: ...
1k 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 ...
317 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: ...
618 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 ...
1k 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 ...
140 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 ...
57 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 ...
32 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.
3k 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 ...
44 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 ...
2k 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 ...
77 views

### What are considered as outliers

I am using this function to see, if I have outliers. ...
32 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., ...
342 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, ...
91 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 ...