time

  1. V

    Visualizing longitudinal data

    Hello, How can I visualize my longitudinal dataset? I have a dataset in which I am interested in seeing the variation of the presence of metabolic syndrome over time for each participant. There are approximately 1,083 participants in my dataset with 1-8 visits each; there is a total of 3,090...
  2. L

    which statistical tests to use?

    Hi, I am very new to statistics. I have some data that I would like to perform additional statistical analysis on it. The data is related to two groups of people. Group 1: control group Group 2: people with obesity Group 2 is following a healthy food plan. Measurements are being...
  3. S

    Statistically significant changes in proportions - comparing 3 populations

    I have data from three populations, 2 observations each populations (opinion poll data from different countries). I am trying to find out if any changes in opinion on the issue i am investigating are statistically significant. So, for one topic In 2010, Group 1 answered 20% yes, Group 2...
  4. P

    Computing sequential time variable- Long format

    Hi Everyone, I am currently looking at lung function decline/change over time. Lung function parameters such as fev1, fvc, fev1/fvc have been converted to z-scores . The data is in long format with each individual having more than 2 assessments until 4. Thus, each individual has data in 2...
  5. R

    Create visit values based on time

    I am trying to create a visit number based on time. The data I have currently looks like this: Date Time Cow 11/1/15 2:00 77 11/1/15 2:01 77 11/1/15 2:02 77 11/1/15 2:03 77 11/1/15 2:04 77 11/1/15 2:05 77 11/1/15 2:06 77 11/1/15 4:00 77 11/1/15 4:01 77...
  6. K

    ANOVA using time variables

    I am trying to find the difference between 3 groups to determine if the times between authorization to an event is different (longer, shorter). They are measured in hh:mm:ss. Can you run an ANOVA using time variables. I never ran it before but assume it works. However, my data is not normal...
  7. S

    Temporal synchronicities

    Hi, My cat died five days ago. The day after, when we buried him, I happened to look at my mobile phone at 17.17, 19.19, 21.21. On Tuesday I looked at it at 10.10, 14.14, 15.10, 16.10, 17.17, 20.20, 21.21, 22.22, and yesterday I looked at it at 11.11. I have looked at my phone a few more...
  8. G

    recoding to datetime syntax

    I am trying to recode a variable. My original survey asked participants to enter a time of day they do an activity on the half hour, ranging from not applicable (coded as 1) to 12:00am on day 1 (coded as “2”) to 5:30am the following day (day 2; coded as “61”). I asked participants to enter...
  9. C

    Multifactorial analysis with R integrated TIME

    Hi! I'm about to analyze data using a multifactorial analysis with the R (Rcmdr) software and I'm not too sure on how to organize the factor groups. My trial includes several: - factors describing plant growth over time (7 sampling dates : root weight, plant weight) - factors describing pest...
  10. B

    Overthinking a 'simple' count variable analysis over time

    Hello everyone. New member, hoping I will be able to contribute and help out! I have been working on this for about 5 days, and gotten to the point where my brain is going in circles. Hopefully you can help me understand what type of analysis this requires. I am conducting what should be...
  11. K

    Summarizing time series data

    Hello, Thank you very much for taking the time to read this! I have many (~70) time series showing the average body size (kg) for the ~50 years. Each time series is for the same species but from a different region/area. I would like to look at the change in body size over time and how...
  12. B

    Correlation Across Time Help?

    Hi I'm a bit lost as to how to calculate the correlation between two groups of numbers across time. I'd like to see if one group, taken from the start of the time frame, has a significant difference or similarity to another group, which represents the remainder of the time. This may be a...
  13. O

    Correct approach to assessing correlation btn events in time domain?

    Hi Folks Firstly apologies if i have posted this in the wrong section - please feel free to advise or move as appropriate, and also apologies if I'm using the wrong terminology here and there - hope you can grasp what i'm talking about anyway! I am doing some research comparing low frequency...
  14. L

    Which test is appropriate?

    I'm trying to test whether time (IV1) has an effect on the relationship between a specific personality feature (IV2, quasi-continuous) and scores on a social cognition task (DV, quasi-continuous). Participants are placed into either a timed or an untimed condition of the social cognition task...
  15. U

    Rolling quarters and four-quarters ended

    Hi, Im working on a financial project that is the past calculated its number on quarterly basis. It would then also have a 4-quarters ended calculation as well. However now we need to run the calculations on rolling quarter basis, in other words every month we run the data for the pervious 4...
  16. K

    regression? model change over time

    Hey all! This is a question about methods. I am really noob but want to learn. If you have a book or papers to suggest that is helpful to! How can you model change over time? Dependent variable: Interest Rate 1980(IR80), Interest Rate 2000(IR00). I have these for many institutions. Can a new...
  17. 0

    Probability of queuing

    We are students and we developing the project of a music festival that takes place in 3 venues. We have identified some risks; one of those is related to the capacity of the venues, the tickets sold and how people will behave during the festival. The total capacity of the venues is 6000...
  18. D

    Multiple Lineair Regression - Another variable needed ?

    Hey, I'm doing a research on 3 variables, exchange rates, macroeconomic news and net speculative positions. So far I have a regression with exchange rates changes being the dependent variable, news and positions being the independent variables. The exchange rate changes are measures in a...
  19. D

    Molding Time in SAS

    How can I build a time variable into my model? I am building a model in SAS and I want to use time of day as a way to predict Y. "Are people more willing to pay for something based on what time of day it is?" I expect people are more willing to pay for something at different parts of the day...
  20. M

    Aggregate data in 1 minute bars

    Hi I have been looking at many ways of aggregating data, but none seem to fit on the dataset I have. See below. What I would like to do is aggregate the data based on 1 minute time bars. The time variable is seconds after midnight, so 1:3599.999 second intervals, with the total amount of...