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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### Sticky: Forum Guidelines: Smart posting behavior pays off

Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

• Replies: 1
• Views: 200,384
07-16-2014, 11:01 AM
2. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 68,589
09-30-2005, 09:44 AM
1. ### Survey Results Help

Hi, We did a survey of our staff in March and had 23 respondents. We redid the exact same survey in July with 19 respondents. We would like to...

• Replies: 1
• Views: 1,365
09-01-2016, 02:31 PM
2. ### ICC analysis: per trial, per condition on per patient?

Hi everyone, I have a question relative to an ICC analysis. I want to compare 2 methods to assess motor blocks occurring during walking in...

• Replies: 0
• Views: 1,412
Mur
09-01-2016, 07:43 AM
3. ### Can I use a pearson correlation with repeated measures?

I have measured 5 different behavioural responses of birds to birdsong playbacks from a speaker (e.g. how long they took to sing back to the playback...

• Replies: 5
• Views: 1,984
08-30-2016, 05:35 PM
4. ### bounds on the value of the SD

I learned stats in a very applied, algebra-based way...so for those of you who've taken a series of more rigorous stats courses, this will likely be...

• Replies: 5
• Views: 2,569
08-30-2016, 12:22 AM
5. ### Calculating chi-squared statistic in Excel

Folks I've carried out a chi-squared test on the following observed and expected values using the CHISQ.TEST function in Excel: Observed: 176,...

• Replies: 3
• Views: 1,559
08-29-2016, 06:45 PM
6. ### Insignificant correlation - significant regression

I couldn't find this on the search - maybe it's too basic ;) So I have two variables which significantly positively correlate with each other (r =...

• Replies: 1
• Views: 1,433
08-29-2016, 01:10 PM
7. ### Statistical method to compare urban vs rural matched siblings

I am writing a study protocol for my masters thesis. The study seeks to compare the rates of Non Communicable Diseases and risk factors and determine...

• Replies: 1
• Views: 956
08-29-2016, 10:19 AM
8. ### index of variability

Hi I have objects and each object have given precentages of their appearances in different situations. For example: object 1 20% 40% 30% 5%...

• Replies: 2
• Views: 1,236
08-29-2016, 05:34 AM
9. ### A/B Split Testing - How to factor in cost?

Hi guys! I'm looking for advices in the application on an A/B split test calculator. Hopefully we can solve this problem together... Here goes: ...

• Replies: 1
• Views: 3,231
08-28-2016, 04:28 PM
10. ### Hypothesis Test

n=45 sample mean = 17.1 sample std dev = 6.4 What is the probability that the sample mean differs from the true mean by 2 or more? Thanks in...

• Replies: 3
• Views: 1,416
08-27-2016, 04:33 PM
11. ### compare groups and examine relationships

Hi, 1.I am planning to examine the level of user engagement of participants playing a particular computer game, that has two versions, one in color...

• Replies: 0
• Views: 1,196
08-27-2016, 03:57 PM
12. ### Request for a dvice on best test to use

Dear all, I'm a total newbie with stats so please forgive me if I'm naive here. I would appreciate your help and expertise for my master's thesis....

• Replies: 0
• Views: 1,410
08-27-2016, 09:45 AM
13. ### Doubt on statistical test

Hi, my perception test presents one stimulus at a time and the listener has to choose one from three possible answers. There are 5 stimuli...

• Replies: 22
• Views: 4,552
08-25-2016, 04:12 PM
14. ### Finding means and regression coefficients of dataset while controlling for outliers?

Edit: in the title I meant CONFOUNDERS, not outliers, sorry!! Hi, I have a dataset which consists of around 50 people, split into 3 groups....

• Replies: 5
• Views: 2,115
08-24-2016, 05:40 PM
15. ### Comparing 2 groups if t-test insignificant

Hi everyone, Is it always wrong to compare two groups if their means are not significantly different, as measured in a t-test, if they are...

• Replies: 0
• Views: 1,187
Rec
08-24-2016, 03:13 PM
16. ### I do not understand standard normal distribution

Hi guys, I'm in dire help for standard normal random variable. I've looked at examples but they don't seem to help with the following questions. ...

• Replies: 3
• Views: 1,151
08-23-2016, 04:24 AM
17. ### Infinite sample AQL approach to confidence level and sample size

Hi all. This is my first post so I hope it makes sense and is appropriate for this forum. For years we have been setting the temperature of our...

• Replies: 0
• Views: 754
rli
08-23-2016, 12:51 AM
18. ### Calculation of expected values for chi-squared test

Folks I need to work out the probability that a set of survey results occurred by chance, and I intend to use a chi-squared test. However, I...

• Replies: 0
• Views: 1,878
08-20-2016, 10:51 AM
19. ### Combining Variables in R-Studio

Hello, I would like to know what function or code I would use to combine variables into 1 factor in R-Studio. For example I have measured six...

• Replies: 0
• Views: 3,002
08-20-2016, 09:34 AM
20. ### R Code/Scripts

Hello, Could somebody kind please advise me on the best source for R code and scripts (in particular for Factor Analysis and ANOVA). Thank you...

• Replies: 0
• Views: 1,284
08-20-2016, 09:23 AM
21. ### Analysing multiple group scores on likert scale

Hi all, Long-time reader, first time poster here. Apologies for the slightly lengthy post. I'm just wanting a bit of advice for something i'm...

• Replies: 0
• Views: 1,089
08-18-2016, 03:21 AM
22. ### Help! problem with confidence intervals

Hi I am studying the relationships between two variables (coded as yes or no) I used the odds ratio formula in R to get the odds ratio and the...

• Replies: 0
• Views: 1,226
08-17-2016, 01:50 PM
23. ### Longitudinal analysis

Hello. I would love some help: I have a dataset with 111 cases of a rare disease registered throughout a 10-year period in one Hospital. I have...

• Replies: 4
• Views: 1,396
08-17-2016, 09:23 AM
24. ### Normalising Search Data

Hi Guys, Just want to start by saying great forums, some really useful stuff on here! I'm basically a statistics novice, though i did do a few...

• Replies: 0
• Views: 943
08-16-2016, 05:59 PM
25. ### Interrater reliability test on 3 raters (2 experts and 1 non-expert) on ordinal data

I need to find the interrater reliability between 3 raters. A nurse (non-expert) performed 60 ultrasound scans and categorised patients into 3...

• Replies: 0
• Views: 728
08-15-2016, 09:47 PM
26. ### which statistical test to use?

Hi people, Im a statistic student curently and Im wondering which hypothesis statistical test i should use. It is to compare the mean of year...

• Replies: 3
• Views: 1,620
08-15-2016, 11:18 AM
27. ### Spearman's rho or no? is one of my datasets non-monotonic?

Hi, I'm dyslexic with limited stat education (and the internet is not helping thus far) and I'm having horrible trouble understanding what tests I...

• Replies: 1
• Views: 1,622
08-13-2016, 09:18 AM
28. ### Statistical test help!

Hello, I was wondering if someone can help me with this. I have a dataset with the following variables: - ID - Type of Outlet: Pastesite,...

• Replies: 0
• Views: 1,560
08-11-2016, 12:46 PM
29. ### Good CFA indices but poor SEM indices

Hi all, I was wondering if anyone could help me make sense of my results from Structural Equation Modelling for my Masters thesis. I've first...

• Replies: 0
• Views: 1,194
08-10-2016, 09:49 AM
30. ### Is multinomial logistical regression appropriate here?

I'm wondering about the appropriate statistical test in the following type of situation: Let's say you think that mouse coat color (black, white...

• Replies: 2
• Views: 1,259
08-08-2016, 11:52 PM
31. ### Create an exponential based function

End product would be a sequence of 50 numbers that go from 0 to 1 with an exponential distribution, so if plotted it would resemble a quarterpipe or...

• Replies: 7
• Views: 1,521
08-08-2016, 04:53 PM
32. ### Time series forecast. Probability of forecasted value exceeding a threshold value?

OK. Let's say that I have several years of monthly sales data. How would I go about finding the probability that monthly sales, three months in the...

• Replies: 2
• Views: 1,984
Stu
08-08-2016, 08:44 AM
33. ### What does this sentence mean? (I'm very new to statistics!)

I'm reading a research paper. It's about the effects of test offerings (opt in, opt out or active choice) to patients on the acceptance of the...

• Replies: 0
• Views: 1,134
08-07-2016, 12:15 PM
34. ### F (18, 95) = 6.009, p < 0.0005

I was looking into a research paper, and this F value was provided when using a regression model. I do not understand, what is the need to discuss F...

• Replies: 5
• Views: 2,467
08-06-2016, 06:50 AM
35. ### Difference in Difference-SPSS: Creating dummy variable

I am doing a program evaluation and want to use difference in difference analysis. I calculated the difference in difference by hand and now want to...

• Replies: 0
• Views: 1,999
08-06-2016, 06:31 AM
36. ### 2 x2 repeated measures ANOVA, significant interaction, all the pairewise comparisons

I ran a 2 x 2 repeated measures ANOVA using SPSS (both IVs are within-subject factors). Both main effects and interaction were significant. Then I...

• Replies: 0
• Views: 1,050
08-05-2016, 08:27 AM
37. ### Model Ratio using Linear Regression

Hello, I have a question about linear regression modeling on ratio. The original model with dependent variable of ratio is Y= (Y1/ Y2). Both Y1...

• Replies: 4
• Views: 1,506
08-04-2016, 08:08 AM
38. ### Urgent help needed: Creating a new specialised correlate variable

Dear SPSS-experts, I'm a student that needs urgent help with the data-analysis of my master dissertation. I've conducted a survey among 150...

• Replies: 0
• Views: 835
08-04-2016, 07:50 AM
39. ### What statistical test should be used?

I've collected data on the number of individuals of seven species at three different sites and want to test if there is a statistically significant...

• Replies: 0
• Views: 1,138
08-03-2016, 04:37 PM
40. ### I'm having difficulty understanding these statistical terms!

Hello! I'm reading a paper on HIV screening, (testing HIV test acceptance percentage by test offer eg. opt in, opt out and active choice). I want to...

• Replies: 1
• Views: 1,057
08-03-2016, 09:43 AM
41. ### two continuous & two categorical variables: how to compare

Dear all, I have the following biological data: 1st variable (continuous, normally distributed): concentration of a hormone in blood 2nd...

• Replies: 3
• Views: 1,545
08-02-2016, 09:21 AM
42. ### Trouble for correlation interpretation regarding mutual funds

Hey guys! I'm working on the analysis of the results of actively managed mutual funds. Long story short, I need to make sure my funds are actually...

• Replies: 0
• Views: 1,022
08-01-2016, 12:16 PM
43. ### Probability Problem

there are two roads from A to B, and two roads from B to C.each of the four roads has independently probability 1/10 of being blocked by snow.What is...

• Replies: 6
• Views: 4,028
08-01-2016, 07:38 AM
44. ### What method is recommended, use contrast or t.test

I have a set with 60 observations, in four groups t1,t2,m1,m2 each with 15 observations. If I want to compare t1,t2 to m1,m2 or t1,m1 to t2,m2 what I...

• Replies: 1
• Views: 2,207
08-01-2016, 02:47 AM
45. ### Need a Proof for a Complicated Covariance equation

Hi everyone I begin to study time series analysis from a short time , and i found this equation which author did not give a proof for it so...

• Replies: 3
• Views: 2,122
07-31-2016, 04:54 PM
46. ### Inter-Rater Reliability - Question Combines Stats and SPSS Procedural Components

Hello, I have a sample of 5,000 health assessments (with ratings from 1-5 on 7 dimensions that roll up to a composite score) completed on 1,400...

• Replies: 2
• Views: 961
07-28-2016, 03:27 PM
47. ### Survey population rules

Hi there! I'm new here so be gentle :) I have a specific problem to solve and I'm stuck, maybe I'm not asking the right questions, but I can't get...

• Replies: 1
• Views: 1,317
07-28-2016, 07:19 AM
48. ### Identifying certain samples in a group

My objective is to understand whether a manufactured item made with a modified process looks better than that same item made with a current process. ...

• Replies: 0
• Views: 1,356
07-27-2016, 12:13 PM
49. ### Technical term for "combination effect"

Hello everybody, For the critics of my bachelor thesis I want to point out that my findings only apply for the used parameters and "combination...

• Replies: 1
• Views: 1,894
07-27-2016, 07:07 AM
50. ### Comparison groups - how to test whether effect is stronger on one group than another?

Hi guys, I would like to know whether a nominal variable (with four categories: credit-, debitcard, cash and neutral priming method) has a...

• Replies: 1
• Views: 1,121
07-26-2016, 02:53 AM
51. ### Use the moment-generating function to find the mean

I have the moment-generating function for the discrete uniform distribution f(x)=\frac{1}{k} for x=1,2,...k: Mx(t)=\frac{e^t(1-e^t)}{k(1-e^t)} ...

• Replies: 3
• Views: 1,748
07-25-2016, 08:41 PM

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