# Tagged Questions

Presenting results in graphical form; for example, histograms, scatterplots, or boxplots.

275 views

### Calculating and comparing histograms of complex numbers

If I have a 1D sequence of complex numbers with real and imaginary parts, how can I compute the histogram of this sequence? Do I separately compute the histogram of both the real and imaginary parts? ...
82 views

### What kind of plot am I looking at?

I stumbled on to these following two slides (slides 21 & 22 on a machine learning tutorial found here): The first is obviously an $x,y$ scatterplot of height and weight. But what is the ...
67 views

### Contours containing a given fraction of $(x,y)$ points

I often need make $(x,y)$ scatter plots that have many ($>10^5$) points. I've experimented with different ways of representing this many points that capture the distribution while getting around ...
88 views

### Chart for seeing trends, correlations, triggers and patterns

I've scraped a set of data, and I was wandering what the best way to start analyzing it was. My initial thoughts were to use a multi y axis graph, like this: The reason I was thinking about a ...
123 views

### How to design good plots for multiple time series?

I have huge (about 100 000) set of time series. I need to show between 5 to 10 time series, chosen semi-randomly on one chart. Chart estate is very limited - plot for each time series is only 100px x ...
76 views

### Graphical representation of variance

I'm learning statistics and I can imagine pretty well what the standard deviation looks like (image here). But, knowing that the standard deviation is the square root of the variance, I just can't ...
78 views

### Plotting fit for binomial lme

I've been asked by a reviewer on a manuscript to provide plots of a model fit for a binomial lme which is specified as follows: ...
56 views

### How to visually show the convergence of a process?

I have some set of measurements that I have represented as vectors $x^t$ for $t \in \{ 1, 2, ...\}$. I want to test "convergence" of the process (visually) in some sense. I thought maybe I could run ...
84 views

### Method for calculating percentiles for a set of time series

I have a set of time series for a given quantity (e.g. CPU). The measurements are roughly evenly spaced, but the data points aren't synchronised between sets and some sets have missing measurements. ...
98 views

### Exploratory data analysis

I have two data sets: one has a continuous response variable whereas the other discrete. I will use a linear model for the continuous data and a logit and probit model for the discrete data. What I ...
243 views

### What are the red lines in quantile regression plot (quantreg package)?

Using plot.rq in the quantreg package in R, we can plot the coefficient estimate distribution, and get something like this: ...
57 views

### Interpreting “elliptic” shape in visualization of high-dimensional dataset, e.g. COIL-20?

There exist an image dataset referred to as COIL-20. There are several paper that describes different dimensionality reduction methods and apply them to produce a 2d plot of this dataset. These ...
98 views

### Visual depiction of experimental treatments in (Poisson) ANCOVA?

Goal: I want to visually depict the difference between experimental treatments while controlling for a continuous covariate in Poisson regression. In my experiment, I am seeking to explain the number ...
110 views

### How to draw a Hasse diagram of a large number of pairwise comparisons?

I have 100 pairwise comparisons where my results show that 33% of the pairwise comparison tests are non-significant. How can I draw draw a Hasse diagram to represent this? Are there any tips to ...
53 views

### Analyzing categorical data where the last category is unbounded

This is a bit of a long-winded data vis question. We're gathering data from a water quality test measuring fecal contamination. The test measures fluorescence in 11 discrete chambers. The water is ...
253 views

### Presenting marginal effects of logit with fixed effects

I have a traditional logit model with a dichotomous dependent variable and several independent variables. One of the IVs is categorical and in my R code, I treat it as a factor. In the past, I've ...
72 views

### R: looking for “time” clusters in a data set

I am new to R and seeking some advice. I have a set (~20M) of data describing on which step a process did fail or succeeded: ...
300 views

### What are some useful data visualisation or data mining techniques to investigate horse racing forms?

I have a dataset of 13k horse races from four different tracks with an average of 11 runners per race. In all, there are 26k unique runners in the data. For each race, I know who came first, second, ...
103 views

### Scatter plots of p-value distribution of gene expression data in R

How do I distinctly represent two data sets on the same scatter plot , to compare the p-value distributions of the genes using R packages? The gene expression values and p-values (obtained by ANOVA) ...
45 views

### Variance in a known population

I am working on a problem that is similar to the standard radioactive decay rate experiment, but with a twist. In the normal experiment, one takes several different measurements of the decay rate, ...
175 views

### Diagnostic plot for assessing homogeneity of variance-covariance matrices

Is there a handy plot for comparing the variance-covariance matrices of two (or perhaps more) groups? An alternative to looking at lots of marginal plots, especially in the multivariate Normal case?
104 views

### Correlation heatmaps with batch effects

I am interested in plotting correlation heat maps for a multivariate dataset collected in two batches. Some of the variables show a clear batch effect others do not show any batch effect. Is there ...
88 views

### What is the best way to show visually the connection between prediction value and independent features?

After applying a machine learning algorithm on some data, I have a table with one column being the prediction value (can be either binary or continuous). The other columns are the independent features ...
1k views

### Interpreting decision trees outputs in R?

I have created 2 decision trees, I just want to assure if I am making correct interpretation about it. Here is my first tree: Note: Right click on image and select view image to view it clearly! ...
149 views

### How do I interpret this McNemar's agreement plot generated by SAS?

I'm running a simple McNemar's test for agreement on the McNemar's example from Wikipedia. The test uses the following data: for patients of Hodgkin's disease. Running this SAS code: ...
161 views

### Clusters produced by R intersect

I am new here - and relatively new to statistics, data mining and R. I am trying to understand why my data is not clustering correctly - or if I am reading it wrong. Shortly about the project: My ...
117 views

### Compare conservation rates of a variable in two-factor experiment

This is probably a very simple question for anyone using R, but I am fairly new to it (and stats in general) and I can't figure this simple computation out. I have 3 varieties of plants (A, B, C) ...
56 views

### Visualization of an ensemble of sequences

What are the standard techniques of plotting a statistical ensemble of sequences? I know the chaos game representation: H. Joel Jeffrey (1992), Chaos game visualization of sequences. Computers ...
225 views

### Cluster similarity percentages with inverted Y-axis in R

I'd like to ask a question here that I've also asked on Biostar (stackexchange) and someone there forwarded me to this website. I was wondering how I could perform a Bray Curtis similarity clustering ...
30 views

### Reduce the number of data points to a minimum in a series

I have maximum 8 series with datapoints. Sometimes the amount of this datapoints of a series is over 500. In worst case i have around 8*90.000 datapoints. I don't need to draw so much because you ...
52 views

### Interpreting Shannon entropy

From a computer simulation I have built a histogram of the results and normalized it so that the probability of finding a point $X$ in bin $b_j$ is $\sum_j P(X \in b_j) =1$. From this I have ...
35 views

### Visualizing/explaining multilevel model (dichotomous IV)

I am using multilevel modeling (xtmixed in Stata) to predict a quasi-continuous level-3 DV using a dichotomous IV (sex). My results are markedly different from what the basic difference between men ...
68 views

### How to visualize changes in time series variance

I am exploring a time series with the aim of detecting obvious changes in variance over time (I have little experience in time series analysis). The hypothesis is that the series has become more ...
31 views

### How to visualize the low-rank visualization result?

In a numerical low rank decomposition, whether it is non-negative matrix factorization(NMF), or binary matrix factorization(BMF), or non-negative sparse PCA, we have two low-rank matrices to ...
75 views

### Data Exploration - How To Bin Data?

There are 1100 data points split into about 35 discrete groups and distributed towards the left. After running a logistic regression which failed, then running it again by only predicting based on ...
179 views

### Visualizing large file-based or Redis-in-memory stored large datasets (millions of data points)

I am very active at StackExchange's QuantFinance forum but thought this question is more suitable to be asked here. I am generating large time series data and store them in-memory in Redis ...
58 views

### Locating a set of 5 geometrically constrained points within a cloud of points

What is the most efficient way to find a set of 5 rigid, coplanar, non-collinear points within a 3D point cloud of, for example, 100 points? (1) The configuration is specified by 2D coordinates (or ...
84 views

### How to algorithmically find plausible covariates at which to plot predicted responses?

I'm trying to plot the predictions of a linear model with multiple numeric predictors as a collection of plots such that $\hat Y$ is on the y-axis, each $X_j$ in turn is on the x-axis, and the ...
35 views

### Visualization and navigation through a Pareto front

I've recently extended my genetic algorithm in such a way that it constructs a Pareto front, instead of weighing the different quality dimensions. The quality dimensions are not related to 'spacial' ...
51 views

### R module for creating plots of prototypical individuals from fitted models?

In order to help interpret fitted models — especially those with interaction terms and non-linear components — I've found it useful to plot predicted values of a dependent variables for what we might ...
141 views

### Plotting confidence bands around fitted values from a binomial GLMM

I have some parameter estimates and confidence intervals estimated from a set of model-averaged binomial GLMMs: two main effects and their interaction. I would like to plot [population level] fitted ...
98 views

### How to make results using Hellinger distance comparable with Euclidean distance outputs?

I have a two kinds of data for the same geographic region. One is presence-absence data of species (for amphibians, reptiles and birds) and the other has several environmental variables for the same ...
69 views

### Plotting a histogram estimate together with an analytical solution of the mean and covariance parameters

How do I plot a histogram estimate of this marginal distribution p(x1): ...
46 views

### Question on re-indexing data for graphing

A file contains data for 1975-2012 of housing prices across a panel of countries. However, it's indexed to 2005, so each country's housing price series converges to 100 in 2005, then they spread ...
65 views

### What sort of data would be visualized with these colormaps?

I have a good feel for the types of data that go with most colormaps. But I don't know what kind of data one would want to use the following types of colormaps: Flag: Prism: Source: ...
33 views

### References regarding rules for multidimensional histograms

Can someone give me references on the theory of histograms applied to multivariate data? Are there any rules like the one dimensional Freedman-Diaconis available for the high dimensional case? What ...
94 views

### Find most likely fit for subgroup size and average density from product and supergroup size

I need to find the most likely sets of group subset percent and frequency for a given result having the super group size. Let me illustrate with an example. Assume I have the following: ...
162 views

### How to display a large number of model results from groups of data?

Suppose I have $n$ data sets where each variable has the same variable types, but possibly a different number of data points. For instance, age, sex, and height, for $n$ different counties. After ...