statistical methods

  1. Z

    What statistical method should I use to comapare variables over time?

    For my final project I am analyzing a data set of my choice and using the statistical methods I learned in the course. However the project I chose requires me to do some research on statistical methods for time-dependent variables as we did not learn them in the course (the professor approved my...
  2. R

    How to analyze this data

    Hello, I need guidance in analyzing the outcome. I have 4 independent variables, and 2 dependent variables. The sample size is ~600. I have two groups: Treatment A and Treatment B. I want to determine if treatment B is better than A in achieving superior outcomes. The independent...
  3. A

    Seek for Statistical Test of Variability Contribution Percentage of Multiple Factors

    Hi, I need statistical test which would tell me which percent of variability in dependent variable is from given independent set of variables and which of unknown ones. Example: Model: Y = Model (X1, X2, X3, ....) Measurements of Y, X1 and X2 are given. I need test which tells me the portion...
  4. B

    Methods for data sample consistency

    Hello, I would like to ask you for your opinion: I have one data sample, let´s say with 600 units used for calculating some statistics (for example mean, std. deviation, q-o-q changes etc.) between the years 2006 and 2016. But from 2017 I would like to extend this data sample to let´s say 700...
  5. O

    Making sense of the data...Data analysis

    Dear Experts, I have data for a 12 months study done on 2 wastewater (Plant A and Plant B—Final Effluent and Discharge Point) treatment plants. Physiochemical (13 parameters tested) and Microbiological(bacterial) data were collected. Also there is the recommended standards against which all...
  6. E

    Chi squared Test

    Hello, I have the following data set: Watersheds: 0 1 2 3 Autism: 10 4 1 0 15 Total: 213 146 25 24 408 The data represents search and rescue cases and how many watersheds away people are usually...
  7. I

    How to answer such interview questions?

    Hi All, I recently had an interview for a position of a Statistical analyst, and I got asked a very interesting and unusual question, that I had not anticipated at all. I was asked: "How many people use the Internet in [insert any country name]?" As I was told, such questions are only...
  8. D

    Question about model validation.

    I'm working on a problem on my own (not for class or work) and I just wanted to get some outside opinions before I progress further. As far as my background, I've taken some introductory statistics courses for psychology majors, and an intro probability and statistics course for engineers...
  9. M

    Statistical methods to determine the proportion to min. value of depandant variable

    I am new to this forum, but heard alot about it from my classmates. I am basically doing an internship in a company. The company is using various channels for recruitment where it is incurring some cost and also facing varying degrees of attrition. I have last three years, month-wise data with...
  10. TheEcologist

    [FAQ] Which test should I use?

    This is often a dramatically difficult task for those who have little experience in statistics. Luckily there are some good online resources to help you choose. A quick general overview can be found here and here(link supplied by bukharin). Here is a great resource from the biological...