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 ...
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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 ...
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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 ...
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1answer
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?
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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 ...
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3answers
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 ...
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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 ...
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1answer
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 ...
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1answer
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 ...
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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 ...
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1answer
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 ...
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1answer
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 ...
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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 ...
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1answer
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 ...
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1answer
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 ...
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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) ...
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1answer
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 ...
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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). ...
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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....
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2answers
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.
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2answers
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 ...
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1answer
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'...
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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 ...
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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-...
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1answer
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. ...
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1answer
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 ...
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1answer
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 ...
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1answer
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 ...
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1answer
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 ...
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3answers
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 ...
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0answers
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 ...
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1answer
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 ...
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2answers
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 ...
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1answer
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: ...
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1answer
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 ...
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1answer
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: ...
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2answers
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 ...
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1answer
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 ...
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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 ...
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1answer
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 ...
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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.
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1answer
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 ...
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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 ...
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1answer
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 ...
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77 views

What are considered as outliers

I am using this function to see, if I have outliers. ...
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1answer
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., ...
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0answers
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, ...
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1answer
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 ...
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1answer
169 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
3k 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 ...