Tagged Questions

4
votes
2answers
145 views

Data visualization of average and standard deviation over a small time series

I am trying to find the best way to visualize the following data: I have values for 3 different times/dates, each time/date has the same 20 species. For each species I have the average height and ...
3
votes
2answers
234 views

Correlogram in R like in Stata?

In STATA I can create a "Correlogram" to find the appropriate lag order in case of time series. E.g. I know I can use the acf or Acf of the forecast package to calculate the ACF and PACF and to ...
2
votes
2answers
54 views

Omit 0 lag order in ACF plot

How can I omit the zero lag order in an acf plot? See this picture: generated by ...
4
votes
0answers
80 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 ...
3
votes
1answer
128 views

Statistically describing/visualizing “non-overlap” in a large set of time-series data

Extensive edit of the original question while I've been able to refine my thoughts and write some better code. Consider data from two processes, each with can produce many, many time series curves ...
0
votes
0answers
20 views

Possible graphical options for my requirement

These are few of the few extra tasks which I wanted to incorporate graphically . It will include main thing as 1 . An 'x' travelling a complete process and the milestones which are covered. Apart ...
6
votes
1answer
186 views

How to view large time series data interactively?

I often deal with reasonable sized amount of time series data, 50-200 million doubles with associated time stamps and would like to visualize them dynamically. Is there existing software to do this ...
4
votes
1answer
122 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 ...
1
vote
1answer
66 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 ...
13
votes
5answers
579 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 ...
5
votes
2answers
185 views

Temporal trend visualizations for regions

I try to reproduce a plot which I found in a publication (Mayor-Fernández et al 2012) showing unemployment rates across time for several regions. It combines a heatmap (?), a time series plot (lower ...
4
votes
2answers
620 views

How to include an interaction term in GAM?

The following code evaluates the similarity between two time series: ...
5
votes
3answers
430 views

Are there references for plotting binary time series?

Does anyone know of recommendations/references for plotting binary time series data? Or categorical time series data? I'm looking at win/loss records, and it seems like there should be plots that ...
2
votes
0answers
50 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 ...
0
votes
1answer
183 views

Visualizing PCA time series

I have the following experiment. My predictors are: Plant area, 6 types of plants, 5 time points and 12 replicates for class. Time points are not equally spaced. A normal plot of Area vs. time will ...
4
votes
3answers
656 views

Analysing over 300,000 rows in Excel to make pretty graphs

I'm doing a research module for my Computer Science degree, and for my topic, I have collected over 500,000 tweets using the Twitter Streaming API, using a ruby script to store them in a Mongo ...
0
votes
1answer
48 views

Detecting increases in twitter list activity

I'm trying to find more information on how to measure and detect increases in activity in twitter list activity. I have access to all the tweets produced by a list of users. The idea is to try to ...
1
vote
4answers
409 views

An approach to visualise/investigate multi-dimensional data

I'm attempting to analyse a large chunk of empiric measurements subject to two parametrised transformations. In essence, the functions take 3 'count' parameters - and returns a sequence of floats in ...
2
votes
2answers
259 views

How to display magnitude of change over time between two series?

Disclaimer: I know absolutely nothing about statistics. I've had trouble searching for answers to my question, as I don't have much knowledge about the terminology of statistics. I'm currently ...
2
votes
1answer
87 views

Smoothing function for displaying stacked lines without the smoothing introducing crossings

I'm displaying time-series data as a "stacked line" or "stacked area" chart. (E.g. with percentage data, data points at 10%, 20% and 30% are displayed at 10%, 30% and 60% on the chart.) Unsmoothed ...
2
votes
1answer
852 views

What does an ACF graph tell me that a PACF graph doesn't?

It seems like the PACF graph is more informative than an ACF graph. What information does one get from an ACF graph that can not be gleaned from a PACF graph. (ACF = Auto-correlation function, and ...
5
votes
2answers
256 views

What is an elegant way of visualising two time series with many data points?

I need to draw two time-series plots on a graph in R. The problem I am facing is as follows. Each plot has 200 data points, and therefore, the graph that I have ...
3
votes
2answers
165 views

Identifying oscillation in a time series

I asked this on the mathematics site, but now I think this is a better place. Sorry for the cross-post. Given any line graph, is there a reliable way to identify any sort of regular oscillation? ...
7
votes
2answers
416 views

Preferred methods for graphing time-series data to present “averages”?

I have data from a load test of a web site with several thousand data points spread out over roughly 30 minutes (the values are the response time of the site in milliseconds). The values are spread ...
9
votes
6answers
340 views

What's a good, generic name for chart of things by time of day?

We're creating a chart showing traffic by time of day over a given period. So the y-axis is traffic, the x-axis is midnight, 1am, 2am, etc. It could also be days of the week. What's the generic name ...
5
votes
1answer
374 views

How can I effectively summarize and visualize time series of employee activities?

I am managing many people entering data into a database. I have a log of user, date, time, table, and action that each person makes: ...
7
votes
4answers
545 views

Annotating graphs in R

This is more of a "how to use R" question than an actual hardcore statistics question, but I think the concentration of R masters here makes this a good forum for it. I'm refreshing a time series ...
7
votes
2answers
148 views

Visualizing activity frequency

Hello data analyst community. I have the following problem: Given a set of n units and a timeline in days. A unit may be active at a certain day to a certain degree (in range from 0.0 to 1.0). A ...
5
votes
1answer
821 views

Normalizing or detrending groups of samples

How do I detrend or normalize multiple series of data so that I can inter-compare between the series? Specifics below may not be appropriate for this forum. Please let me know and I can remove or ...
1
vote
2answers
163 views

Graphing low-end prices of goods in a market over time

I have a large sample of market data - that is the prices and amount of goods being sold by vendors at specific, but inconsistent, points in time. Assuming I am a buyer and the quality of the goods ...
7
votes
2answers
2k views

How do I vertically stack two graphs with the same x scale, but a different y scale in R?

Greetings, Currently I'm doing the following in R: ...
6
votes
3answers
450 views

Visualizing two scalar variables over time

What would be the best way to display changes in two scalar variables (x,y) over time (z), in one visualization? One idea that I had was to plot x and y both on the vertical axis, with z as the ...
7
votes
4answers
290 views

Good line color for “threshold” line in a time-series graph?

We're plotting time-series metrics in the context of network/server operations. The data has a 5-minute sample rate, and consists of things like CPU utilization, error rate, etc. We're adding a ...