statistical tests

  1. 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...
  2. A

    Statistical test for comparing percentage not mean

    Hi, I am wondering what test should I use to compare two percentage value from two different observations. Let's say I have a damage of crop 15% versus 2% in control, is there a ways to statistically test the significance between the two values? Not sure if this make sense statistically...
  3. R

    How to analyze this data

    Hello, I have a database with 4 independent variables, and 2 dependent variables. The sample size is ~600. I have two groups: Treatment A and Treatment B. The independent variables in each group are #1: Continuous, #2: Ordinal (3 levels), #3:Ordinal (5 levels), #4 Categorical (Yes/No)...
  4. R

    Psychology Stats Report Help Please

    Hi there, I'm currently working on a statistics report for a project in psychology. I've collected two lots of data: test scores on two different units of an A-level course: one group is only taking two other subjects, and a second group is taking three subjects. So essentially: 2...
  5. E

    Mean Significance Statistical Test

    3. In two wards for elderly women in a nursing home the following levels of hemoglobin were found: Ward A: 12.2, 11.1, 14.0, 11.3, 10.8, 12.5, 12.2, 11.9, 13.6, 12.7, 13.4, 13.7 grams/dl Ward B: 11.9, 10.7, 12.3, 13.9, 11.1, 11.2, 13.3, 11.4, 12.0, 11.1 g/dl Ward A Ward B n = 12 n =...
  6. M

    Testing when one year's sales volumes vary significantly from this time last year

    Hi all, I have a puzzle regarding sales volumes and how to know whether, 6-months into the year, for example, my current volume is on track for budget or not. E.g. it might be -5% off where I need to be to be matching a profile based on last years figures but scaled to hit my target for this...
  7. S

    Dependent variable from ratio counts. That's discrete? If yes, which test for low Ns?

    Hi all, I have a rather specific question, I somehow don't seem to be able to find the answer to. So I work on biological tissue, where I count the number of cells that have been 'touched' by a particular axon. Meaning that my counts are ratios-percentages: dependent variable: 'percentages of...
  8. J

    Which test to use?

    Thanks in advance for reading my post. I have a year's worth data that describes the frequency of patient falls organized by the attending physician. Each physician has a unique number of cases (i.e. one doc can have 40 cases, and another has 15). I want to know whether the monthly count...
  9. M

    NEED HELP with understanding when to use what method

    I have been trying to familiarize myself with statistics but I'm getting confused on what methods to use when answering what questions. For instance, if I want to determine which of a set of tested parameters (A, B, C, ...) are significantly different between two groups, would I use a t-test...
  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...