# Questions tagged [time]

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### Modeling count data with time-dependent rate

For processes of discrete events occurring in continuous time with time-independent rate, we can use count models like Poisson or Negative Binomial. For discrete events that can occur once per sample ...
8 views

### Weird pattern appearing in data?

I’m using a histogram to analyze coincidences across three sets of data. The three sets of data are timestamps from three instruments. To identify coincidences, I start by pairing each time stamp in ...
16 views

### Get the average time between 1st and 2nd call (postgresql)

I have the following data in a table where I want to calculate the average time between 1st and 2nd call. I know how to get the average, but I have a tough time figuring out how to subtract the 2nd ...
21 views

### LSTM for time series forcasting

I manipulate the time series using the different structures of the neural networks in order to make a prediction, and I wonder if there is a way to choose the parameters of the networks intelligently? ...
25 views

### Appropriate Machine Learning algorithm for modeling clustered time-varying binary outcome

I'll just dive right in. I have a decent-size (100K observations) dataset of time-varying continuous and categorical predictors. Categorical predictors, actually, usually do not change, however, ...
25 views

### Classification with feature not available at time of model creation

I have problem statement to predict the probability of solving a task depending on multiple features for e.g. when the task was created, the time needed to work on a task, etc Please find a dummy ...
51 views

### Date and time extraction from Excel file in Python or Pandas

I have an Excel file with a column that contain both date and time in a single cells as follows: 2020-07-10T13:32:01+00:00 I'm wondering how to extract this cell, split date and time (that are ...
31 views

### Expected value based on periodical interval measurements

Suppose you want to measure a process that goes on/off every 100ms +- rand 3000ms. Your tools can do probes ones in >=1500ms. ...
18 views

### Python Pandas, how to select cases for which timestamps should be rounded?

I need to only select the cases for sensor type == air to be rounded to the nearest 5 seconds but do not how I should use a function to make this happen. I do have the following lines: ...
9 views

### Tool for annotating video gestures

I'm looking for a tool for annotating gestures in a video. There are tons of tools for tracking objects in videos, but all I want to do is annotate when gestures start and end in a video, not where ...
14 views

### Help reviewing time series concepts for flashcards

Next week I'm going to have a test reviewing time series. Our professor gave us about 100 true/false questions to review as a basis for creating flash cards. There are a few I have questions about ...
31 views

### Help improving my “read_excel” execution time in python. My code reads slowly

My first question here so please bare with me. I'm trying to feed my neural network with training data read in from an excel file. It works perfectly fine when i have less than 50 rows in the sheet. ...
14 views

### Machine learning time intervall partition?

So I knew the basics of the ML, and now I would like to solve a task, but unfortunately I don't know how to approach, and what kind of algorithm should I looking for. I try to write the problem: The ...
19 views

### Is there any know algorithm or technique to detect IOT clock anomaly

I have some IOT machine in place and a user have to present a NFC card on it when using one of this machine. When the machine is detecting the card it send an event to a backoffice system with the ...
11 views

### Standard(s) for data representing measurement times with their interval of validity?

Is there a standard for representing the time interval of a measurement? Any actual measurement is made at a point in time with, perhaps, an interval over which it is considered valid. For example, ...
74 views

### In survival analysis, which is the correct way to introduce a variable which changes the survival rate but occurs at different times?

I am making a survival analysis with a cox regression with proportional hazards, we want to analyze wheter the introduction of a phenomenon influences the time until the death of an individual. A ...
46 views

### How to avoid bias when optimizing time-series model?

I have 4000 days of data. I am trying create a time-series model with parameters P to forecast the value of the target Y using the last N days of data. The parameters P include: lookback window for ...