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Questions tagged [periodicity]

Questions about periodicity, an interval of time. It can represent a clock or an interval between days, minutes or any other unit of time.

Questions about periodicity, an interval of time. It can represent a clock or an interval between days, minutes or any other unit of time.

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Can I extract periodic components using the second smallest eigenvalues of periodicity error?

I want to detect periodic components in EEG channels using Periodic Component Analysis. I describe briefly the procedure because the algorithm is not very well-known. I minimize periodicity error function: error(τ)= E[s(t+τ) -s(t)] / E[s(t)^2],…
ece_Ioanna
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finding periodicity in a sequence of matrices

Below is the snapshot of the csv file with many columns (Actual file is very large). Each column corresponds to a times-tamp value of a "system state". What i intend to find is the period of these columns occurrences ie will the system state repeat…
Manish Bhanu
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Solving differential equation until periodicity

I would want to solve a differential equation in MATLAB odeopts = odeset('MaxStep',dt); [t,X] = ode113(@MyDiff,tSpan,X0,odeopts); Here dt, MyDiff, tSpan and X0 are defined earlier in the code. The problem is, that the discretisation step dt is very…
yarnamc
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Implementing both requestSync and periodicSync in the same app

I need to implement requestSync on button click and additionally periodic sync. I'm aware that requestSync isn't best practice, but that's just requirement, I have to do it. Questions are: 1) if I set up periodic sync's pollFrequency to be 24hrs,…
Nazerke
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Measuring periodicity strength of a specific time on the time series data

I try to measure periodicity strength of a specific time on the time series data when a period (e.g., 1day, 7day) is given. For example, | AM 10:00 | 10:30 | 11:00 | DAY 1 | A | A | B | DAY 2 | A | B | B | DAY 3 |…
realhoon
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SQL: detect when a recurring log (every 30s) is missing

We have an SQL job that runs every 30s where we logged every step (SQL Server 2012) Sometimes, without any reason, and without any "job failed" message, the job stops and even hangs (behavior that we would like to analyse). What we would like to…
Waza_Be
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Auto-correlation-like algorithm for detecting periods in non-numeric data?

In the past I've used auto-correlation to detect periodic structures in numeric data. This algorithm works even if the data isn't repeated (exact copies) but just follows a general periodic structure. It can also work okay if the data is binary,…
Justin Olbrantz
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Timeseries spectral analysis with lsp

I need to cut the information about weekly period because I think that it is polluting the graph. I would like to get a graph between peaks concentrated on 50-150 days. I am using Lomb-Scargle Periodogram by lsp package in R, with this…
Jefferson Santos
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How can I filter a table for the field values on the last(highest) date in a custom four week period, using DAX in Power BI?

I created a calculated table based on start and end dates to check which manager is responsible for a product per date. Result: The financial department uses a four week period to report. So 13 periods per year. (not usable in a date…
ecrins
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How to identify a simple periodic pattern in a data set?

I have a data set similar to the given image: Here, Device 1 is sends a signal (i.e., active) at every 2 minutes (periodically) while the devices 2 and 3 sends a signal sporadically. My question: How can I find that Device 1 sends a periodic…
Nht_e0
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Extract data values at a higher frequency than time stamps

I have continuous behavior data with the timestamp when the subject changed behaviors and what each behavior was, and I need to extract the instantaneous behavior at each minute, starting at the second that the first behavior began: if the behavior…
jolson
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DBSCAN clustering of periodic (Cyclical) time data

I am using Matlab's DBSCAN function to cluster data collected from a workplace that shows the times of Customer In and CUstomer out (in hours). When I ran dbscan, it works fine for data points that has in and out times during the day. However, when…
Net Zero
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how to handle non-periodic timeseries in bfast (R)

my problem is the following : I have a Landsat NDVI time series that is non-periodic/doesn't have a homogenous frequency. However, the error code I receive is Error in stl(Yt, "periodic") : series is not periodic or has less than two periods after…
Tanja
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2.5d line plot for periodic data in Python

I have a surprisingly challenging visualization need. I want to plot periodic data on what I'd call a 2.5d line plot, so that periodic patterns can be directly viewed on raw data with minimal processing. Input data is simply three columns: one…
gaborous
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Interpretation of Wald test in modelling periodic data (cosinor package)

I'm using the cosinor library to fit a model using the built-in dataset library(cosinor) fit <- cosinor.lm(Y ~ time(time) + X + amp.acro(X), data = vitamind, period = 12) Now to test if the X variable contributes to the model I…
Ana
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