# Tagged Questions

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

127 views

### Inter quartile range and outliers in boxplot with logarithmic y-axis

Let's say I have a set of data which are lognormal-distributed and I want to create boxplots. The part of the values which is symbolized by the box may lie somewhere around 1. In that case, the inter ...
348 views

### How to visualize three different data sets on the same graph?

First of all, I would just like to point out I have next to nothing knowledge about data representation, so I would be more then thankful if someone could answer this question on as basic level as it ...
65 views

### ANOVA 'factor level comparison' methods

We had an exercise in statistics class where we did a small ANOVA analysis. We were comparing how the two levels of a factor influenced the response under different conditions (combinations of other ...
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: ...
249 views

### Plotting the fitted values and their confidence intervals

Can one one suggest any suitable plot that shows the observed values, their fitted values and 95% confidence intervals for the fitted values?
78 views

### How to present the Bayesian approach

I am writing a dissertation in which I use maximum likelihood estimation and an alternative Bayesian approach. I have written up the maximum likelihood estimation approach. However, I need some advice ...
336 views

### Data visualization from hierarchical clustering

I have data from questionnaire from school. 35 questions are various questions (influence of friends etc.) Possible answers for 35 questions are "definitely yes", "mostly yes", "mostly no" and ...
182 views

### Index plot for each cluster sorted by the silhouette

After a cluster analysis I´m trying to plot for each cluster the Index plot of the Silhouette value instead of for the complete dataset (like in the WeightedCluster Library Manual by Matthias ...
208 views

### Any alternatives for plotting (long) time series?

I'm looking for ways to visualize large time-series other then in traditional 2-axis line charts. More specifically, I hope to find a way that intuitively reveals patterns in the data such as the ...
1k views

### Plotting logistic regression interaction (categorical) in R

Hello I have the following logistic model with a categorical variable interaction which I wish to plot in R but I am struggling to find any solutions - ...
1k views

### Is there a “hello, world” for statistical graphics?

In computer programming, there is a classic first program for learning/teaching a new language or system, called "hello, world". http://en.wikipedia.org/wiki/Hello_world_program Is there a classic ...
69 views

### What kind of Diagram to visualize Results from Software Usability test?

I know how to use R but I am kind of stuck on the statistical part here: I need to visualize the results from a software usability test where the total number of clicks of each tester for every one ...
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

### Line graph has too many lines, is there a better solution?

I'm trying to graph the number of actions by users (in this case, "likes") over time. So I have "Number of actions" as my y-axis, my x-axis is time (weeks), and each line represents one user. My ...
940 views

### Best way to display data with outliers?

I am fairly new to data analysis and visualization, and I'm trying to figure out the best model to show some data regarding page load time (in seconds). The current view is a line graph where the ...
201 views

### How do I fit a non-linear regression to only one factor level on my scatter plot?

My data is structured like so: 'data.frame': 50 obs. of 3 variables: Project : Factor w/ 2 levels "A","B": 1 1 1 1 1 x: int 2 2 2 2 6 4 4 4 6 4 ... y: num 0.622 0.425 0.363 0.344 0.346 ...
181 views

### Truncated y axis in interaction plots

I am trying to visualise an interaction of two factors on a single Likert-scale item in R with data similar to the following: ...
280 views

### R plot time indexed densities

This is pretty close from what I would like to do. More precisely, I would like to represent graphically a sequence of inferences on time-indexed RVs $X_{t_i}$ by plotting at each time $t_i$ the ...
87 views

### Gap in plot between forecasted and real data

I'm trying to plot forecast and real data on the same plot. But there is always gap between them on the image : I use for the forecasting following code: y=boardings[,1] ## Simple ...
90 views

### Techniques to show data spanning multiple decades

I have a scatter plot where each point is at integer coordinates that may include 0 for both X and Y. The range of each coordinate is large, but most of the data is clustered around 0. Ordinarily, I ...
503 views

### How do you visualize binary outcomes versus a continuous predictor?

I have some data I need to visualize and am not sure how best to do so. I have some set of base items $Q = \{ q_1, \cdots, q_n \}$ with respective frequencies $F = \{f_1, \cdots, f_n \}$ and outcomes ...
207 views

### Network Visualisation for huge dataset composed of many unconnected clusters

I have a dataset which consists of 190,455 nodes and 1,241,638 edges. These can be broken down into a set of 2300 subgraphs which are not connected to each other. I am having trouble creating ...
3k views

Lee and Lemieux (p. 31, 2009) suggest the researcher to present the graphs while doing Regression discontinuity design analysis (RDD). They suggest the following procedure: "...for some bandwidth ...
34 views

### Two-Component distribution modelling

I am trying to plot a two-component mixture distribution $F_X(x):.7N(0,1)+.3N(3,1)$ with density $$f_X(x) = {0.7 \over {\sqrt{2\pi}}} e^{−x^2/2} + {0.3 \over {\sqrt{2\pi}}}e^{−(x−3)^2/2}$$. I have ...
195 views

### Replicating a plot from the ROCR Website

I'm trying to reproduce this plot from the ROCR website: I can get something similar as follows: ...
65 views

### Tool for reading values from the chart

I am given a paper with Kaplan-Meier curve. I'd like "reverse-engineer" the chart to get the original data (without the censoring events, as they are difficult to discern in my low quality copy). ...
125 views

### Formula for probability-probability plot

I am programmer developing a Software that features the display of a probability plot. As far as I know there are 2 different ways to display a probability plot (please correct me if I say something ...
447 views

### Understanding of persp plot

I do not understand the persp plot, my example is: ...
454 views

### How to elegantly determine the area of a hysteresis loop (inside/outside problem)?

I have measured two parameters (Dissolved organic carbon DOC = y, and discharge = x). When these two variables are plotted against each other, we get a hysteresis loop (see code example and picture). ...
135 views

### Looking for a specific kind of plot/graph

I'm looking for info about a particular kind of graphing technique. Basically, you have a list of elements, and data indicating how closely related the elements are to each other. On the plot, ...
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! ...
288 views

### Logarithmic scale on a plot with negative values

I would like to plot two time-series on a same graph. One series takes much larger values than the other, so I thought a semilog scale might be appropriate (i.e. linear X (dates) and log Y). However, ...
1k views

### Does anyone know any good open source software for visualizing data from database?

Recently I came across Tableau and tried to visualize the data from database and csv file. The user iterface enables the user to visualize time and spatial data and create plots in an instant. Such ...
578 views

### How do I create and interpret an interaction plot in ggplot2?

I am trying to make an interaction plot for this set of data, but I want to make it with ggplot2. I am trying to predict VP using the predictors G and P, (these are columns in the dataset which I have ...
528 views

### Outliers for boxplot

If I have a set of data and I want to display it as a boxplot, when there are some outliers in the boxplot, we indicate outliers with a *. If there are two outliers ...
773 views

### How do I interpret the results from a basic interaction plot from the R effects package?

Using the method in this post, I have made a plot to visualize the interaction between two predictor variables using the effects package in r, but I'm not really sure what I am looking at. Tide ...
317 views

### Learning an extra programming language (other than R)? [closed]

My work involves building statistical / econometric models using R, SPSS modeler. I am also doing my PhD (part time) in econometrics. In order to do more advanced data / model visualisation I am ...
460 views

### Graphical representation of weekly spending

What is the correct graphical representation for these data of weekly spending (in dollars) on soft drinks for 20 people: ...
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 ...
222 views

### Is there an upper limit on the number of intervals in a histogram?

I've read several articles and excerpts from books that explain how to choose a good number of intervals (bins) for histogram of a data set, but I'm wondering if there's a hard maximum number of ...
63 views

### Extracting numbers from excel table items for diagram visualization [closed]

I am newbie in Excel and I wanted to know is it possible to make Microsoft Excel to interpret following dataset: ...
149 views

### How to calculate “Paths to the White House” using R?

I just came across this great analysis which is both interesting and beautiful visually: http://www.nytimes.com/interactive/2012/11/02/us/politics/paths-to-the-white-house.html I am curious how such ...
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: ...
146 views

### Formatting graphs and figures: why and when is it bad to include horizontal lines?

I am TAing a course where students are required to turn in their lab reports formatted like a submission to the journal Ecology. Figures and graphs in this journal do not have the horizontal lines ...
440 views

### Most effective use of colour in heat/contour maps

It's quite common to use heat/contour maps when presenting time-frequency EEG findings. The colour scheme often chosen (and one that I like and use) is the "jet" colour scheme (see e.g., google image ...
56 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 ...
3k views

### How to actually plot a sample tree from randomForest::getTree()?

Anyone got library or code suggestions on how to actually plot a couple of sample trees from: getTree(rfobj, k, labelVar=TRUE) (Yes I know you're not supposed ...
852 views

### Ways to reduce high dimensional data for visualization

I'm working on a 2D physical simulation and I am collecting data in time at several points. These discrete points are along vertical lines, with multiple lines in the axial direction. This makes the ...