data analysis

  1. D

    Which statistical test should be used?

    Take a quiz and refresh your knowledge in selecting the appropriate statistical test/procedure to answer a given research question. This assessment (25 MCQ+ brief demographic questionnaire) is designed for graduate students in social and behavioral sciences and developed as a component of a...
  2. J

    Reading dataset stored in vector form in R

    I am new to R how can I read a dataset stored as vectors and with comments in it into R? See Attached. Thanks in advance.
  3. N

    Compound poisson gamma model and biomass data

    I have some biomass data (total count -discrete- of individuals and total dry weight -continuous-) that I would like to model with environmental parameters recorded at different spatial scales (temperature -continuous-). My biomass data is zero inflated mainly due to scale inaccuracy and as a...
  4. C

    Methods and Data Analysis for Experimental Study Design

    Good day! I am working on my methods section for my dissertation proposal and want to ensure I am thinking through my methods and data analysis correctly and using the appropriate statistical tests. I plan to collect data this fall. Thank you! Purpose Statement This purpose of this...
  5. P

    Learning analytics

    Hi all. I am a newbie to data analysis. I am an online learning facilitator for an online seminar-based program for local high school students. Since it is a 100% online program, there are no face-to-face sessions. They have to complete online short quizzes (1 question per quiz, 2 to 3 quizzes...
  6. T

    What is the best way to determine the convergence of data?

    I'm doing some research with Matlab (materials science related), and a lot of my work involves statistical analysis, of which I'm not super familiar with (so I apologize in advance if I'm not using proper terminology). For this project I'm measuring some data, and I want to come up with a way to...
  7. M

    what is the objective of yeast dataset?

    Recently, l started working on yeast data (http://archive.ics.uci.edu/ml/datasets/Yeast). My goal is to do an exploratory statistics upon these data, l applied PCA (principal component analysis ) as a tool of analysis. However l'm not aware of the objective of yeast data , l finally found some...
  8. rogojel

    What does Python offer that R can't?

    Hi, I am looking at Coursera data anlysis specializations and most (basically all except John Hopkins) offer Python as the language of choice for their courses. I really like R but I started to wonder if I am missing something? I just see no advantages in Python for data analysis, that would...
  9. E

    How to measure- effect of additional categorical DV on repeated m. ANOVA?

    Hello, I am helping a colleague analyze data from a user study. I am a little unclear how to deal with one of her measures. I would greatly appreciate any help! Description: Independent variable: -interface modality: -audio (A), visual (V), haptic (H), control (C- no interface) Main...
  10. L

    SPSS coding question

    Hi everyone. I'm a little confused as to how I'm supposed to recode a specific item based on the coding of the item proceding it using SPSS. I've attached the specific case I'm referring to to this post - it's Item 8 from the SF-36 health survey. Any help would be greatly appreciated, thanks.
  11. C

    Statistical significance of deviation from a complex-valued model

    I have complex-valued data. At each one of about 100 linearly spaced x values, I have a corresponding measurement of a complex quantity with well-defined Gaussian uncertainties on both the real and complex parts. For the simplest applicable physical model, the data should be described by a...
  12. C

    [Excel] How to keep track of metrics

    I have a data table with 3 Columns that I want to be able to measure the performance for. Ex. Number| Stage | Date/time 111111 | First Stage | 06/25/2015 10:00 AM 111111 | Second Stage | 06/25/2015 11:00 AM 111111 | First Stage | 06/26/2015 09:00 AM 111111 |...
  13. T

    Research Problem (Hypothesis and Data Analysis)

    I am conducting a research on the influence of school administrators on teachers’ retention. I have collected data on this with likert-scaled (5 point 0-4) questionnaire from about 107 respondents. The two hypotheses for this research are: 1. There is no significant influence of school...
  14. B

    Complex study data analysis

    Good afternoon, I have a long-running experiment on music and emotion for my Ph.D. research. Big picture—there have been nine total ‘versions’ (instantiations of the experiment). There 5 different ‘designs’ that we ran in Dublin, Ireland. The fifth design is then what we’ve also run in New...
  15. I

    How to determine number of data points and period of data to determine confidence?

    Dear Statisticians I have done some experiments, with continuously data acquisition, on shrinkage measurements over time. My data shows exponential regression curves. Based on the data I want to estimate how many data points and at what time the data should be gathered, to obtain a certainty...
  16. D

    Help choosing a statistical method for data analysis

    Hi everyone! I am working on a hypothetical research proposal for a sensation and perception class and I need help with the data analysis section of the paper. My hypothesis it that people who have been blind for longer than five years have better tactile acuity than those who have been blind...
  17. S

    4 variables, 2 surveys.. how to link? please help!

    hi :wave: i have 2 surveys. The data is collected from both managers and subordinates, the first one has just one variable (moderator) and the 2nd has 3 variables (mediator, independent variable and dependent variable ) i have 1 independent variable , 1 moderator, 1 mediator and 1 outcome...
  18. B

    Question about histogram construction

    Hello. I know this may be an obvious answer, but my instructor has given me this question Part I. The following twenty data are the yields of the weight (pounds) gained each month per person. 7.0 4.0 3.4 5.1 6.8 4.4 6.6 5.6 4.6 3.6 4.8 5.6 7.4 5.0 5.0 5.8 3.8 6.3 5.6 5.6 Construct a...
  19. N

    Intraclass Correlation Coefficient Types

    I have two datasets in which I probably need to use the intraclass correlation coefficient, and I want to make sure I choose the right type. Dataset 1: I had 20 randomly selected human subjects rate 50 faces based on their attractiveness on an ordinal scale from 1-5. Each subject rated the...
  20. rogojel

    Multi- and Megavariate Data Analysis -

    hi, I am thinking about buying this book: http://www.amazon.com/Multi--Megavariate-Analysis-Principles-Applications-ebook/dp/B00FTFZM2M/ref=sr_1_1?s=digital-text&ie=UTF8&qid=1408695914&sr=1-1&keywords=megavariate I got the first chapters on Kindle and it looks really interesting but it...