statistical significance

  1. E

    5 year average data- statistically significant increase?

    Here is the scenario: I have 5 year average information for # of reported Campylobacter cases (a bacterial gastrointestinal illness) for a particular region. # from April to June, 2014-2019 2014 = 2 cases 2015 = 5 cases 2016 = 0 cases 2017= 6 cases 2018 = 11 cases Which makes the 5 year...
  2. A

    Chi-square post-hoc test - Helpless

    I have been looking around on the net looking for the best way to do a post-hoc analysis for multi factor significant chi-square test, with no success. I have a data-set of patients with different disease subtypes (Lung cancer subtype A-H). So my two main variables are - Ethnicity (12 levels) -...
  3. A

    Comparing subsets of a population with a very different size (power law case)?

    My population (12000 data) is characterized by events that are either of type A or of type B. My goal is to figure out whether the relative proportion of A with respect to B does change if a property of the events (the size in my case) change. My first approach was quite simple: dividing the...
  4. M

    Similarity, Dissimilarity Test

    Hello all, I am a graduate student. For my research, I am dealing with traffic data of different time period (such as June 2014 vs July 2015) of the same road at rush hours. So I have a set of data from June 2014 and the data for the same road during rush hours at July 2015. Now I would loke to...
  5. E

    Determine sample size to get a statistically significant result

    Hello, this question concerns the topic of A/B split-testing. More about it on wiki here. I need to determine what is sample size would I require to get a statistically significant result for my experiment. I can see how an economist at Google is doing it. However, our don't understand the...
  6. G

    What statistical test do I use to tell if my data statistically significant?

    This is for a PhD experiment I am working on. I have 5 types of rock samples. I am trying to understand how their ability to preserve a type of fossils differs and whether the difference is statistically significant. I determined the presence or absence of the fossil (using a spectroscopy tool)...
  7. B

    statistically analyse pass rate of test in different locations

    I'm looking to analyse some data and as it's been a long time since my statistics days I'd like to know which area of statistics my problem lies. Lets say I have a number of different driving schools, each doing the same test of their student drivers' ability to have a licence. Now every...
  8. Y

    How to identify statistical significance between groups?

    I am new to statistics. We conducted the census survey (no sampling) targeting on adults living in one particular area with high response rate. We asked them to choose only one methods/approaches out of six to solve local issues. Methods : a, b, c, d, e, f Male : 25, 30, 10, 5, 20, 10...
  9. D

    Statistical significance of mailing

    Hi All, I'm needing help with identifying the statistical test to conduct in order to determine whether or not the results of my test are statistically significant. I have done a mailing and split the audience randomly into two discreet groups. I then have data for response, cost per...
  10. S

    How can confirm the data in the table is statistically significant?

    Hi, Please find the table document. https://www.dropbox.com/s/s22obnlizefeejj/stat%20check.xlsx Numbers in bracket refers to number incidents in a particular stages occurred over months in a year under each category C1, C2, C3. Total number of INCIDENCE is 240. January month incidences (142 +...
  11. A

    Nonparametric statistical significance test for largely skewed count data

    My research design looks as follows: an experimental game with 4 participants (human subjects), repeated for 20 rounds. During each round, participants are allowed to form bilateral coalitions which cannot be dissolved until the end of a round. Hence, six different possible coalitions exist, but...
  12. M

    statistical significance of sequence

    Hi, Suppose I have a set of sequences of length n with symbols from an alphabet A = {a1, a2, ..., an} A particular sequence may appear multiple times in the set. I would like to know which sequences have frequencies that are statistically significant. That is, I would like to identify...
  13. W

    Statistical Significance of a learning Model

    I built a learning model (for classification) based on a Random Forest classifier and i am asked to assess the statistical significance of its performances. Up to now, i trained and tested it on two different datasets A and B, respectively. What kind of test can i use?
  14. B

    How to prove that a sample is statistically significant?

    Hello, I've been searching all over the internet for a formula or a test that will help me understand if my sample (41 answers) is statistically significant of the population (78 people), but I'm getting a lot of different formulas and all of them give me different results. I was wondering if...
  15. K

    What is the difference between statistical significance (based on probability) and...

    (Questions wouldn't fit) What is the difference between statistical significance (based on probability) and an effect size? I am fairly new to stats and finding a bit of an up hill marathon at the moment. I have been asked to research the question posted above, yet I have exhausted my...
  16. J

    Determine if a worker differs from typical performance?

    I'll start with some details about my specific situation. I've got a database that contains records of jobs, clients, and workers. My goal is to see if a given worker has a lower than average score when it comes to converting first-time jobs into recurring jobs. I do this by taking all...
  17. E

    Census data rules, variability and significance

    Hi I am having trouble understanding census populations, variability in census populations, and how and why one is allowed to attribute significance to tests conducted on data derived from census populations vs population samples. 1) Is there any point at which missing data points invalidate...
  18. K

    Help - comparing percentages in programmatic survey data

    I am a public health researcher that usually does qualitative research and am now trying to analyze a quantitative survey (in Excel no less). Can anyone help me figure out how to compare two percentages from my results to see if they are statistically significant? A bit of background, I...
  19. L

    Interpret results for a proportion end point.

    I am doing a study to determine the efficacy of a drug. The efficacy of the drug is measured as the proportion of patients with HbA1c (diabetes control level)<7%. With the help from Talks Stats, I was able to determine a sample size of 73, where p = 95%, t (CI) = 1.96 (95%) and m =5% (using...
  20. B

    Dependent samples?

    Hello, My first post here. I am analyzing a marketing survey. A snapshot of a subset of the data is attached. I am interested in finding out whether respondents who do not know company 2 are generally less aware or not. I have developed an awareness measure and calculated for all respondents...