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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: 197,158
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: 66,946
09-30-2005, 09:44 AM

This is a test to see if Dason views this thread first.

• Replies: 4
• Views: 1,435
09-06-2013, 03:05 PM
2. ### Bird watching

Hey guys I wish to tell which of 2 species is the most common in both abundance and detection. I have data from 60 different sites. In only 4...

• Replies: 0
• Views: 1,101
09-06-2013, 10:52 AM
3. ### ANOVA issue with experimental design

Hey guys; I am evaluating the effects that various factors may or may not have on the output of a process. Each of the factors has a different...

• Replies: 3
• Views: 1,470
09-06-2013, 07:31 AM
4. ### Matched pair t test onesided (Minitab)

I am doing a matched paired t test in Minitab and the assignment is to find whether method A is generates lower test results for a certain test than...

• Replies: 3
• Views: 3,888
09-06-2013, 05:39 AM
5. ### Critical literature review- lost to how to analyize data from many different sources

Critical literature review- choose a topic, select many papers (30-50), extract data from papers and critically analyze to determine the overall...

• Replies: 2
• Views: 1,430
09-05-2013, 12:05 PM

Suppose you wish to test the following hypotheses: Ho: p <= 0.25 and Ha: p > 0.25. If the proportion observed in a random sample of 100 items...

• Replies: 9
• Views: 2,706
09-04-2013, 03:33 PM
7. ### Partial eta squared

For my thesis I need to refer to a document which contains the standards as to which values of partial eta squared are considered low, medium or...

• Replies: 5
• Views: 10,215
09-04-2013, 09:34 AM
8. ### Is normal dist OK for these count data?

Hello, I am modelling some count data (ANCOVA). I use R for statistical computing. I am not sure if I must use a glm with poisson errors.

• Replies: 3
• Views: 10,784
09-03-2013, 05:49 AM
9. ### Interpreting Results in Primer

My frequency distribution of R varies from <-0.07 99% <0.10 at 0.1% but the R (Global) is equal 0.484 at 0.1%. what results to consider?

• Replies: 0
• Views: 2,317
09-03-2013, 05:37 AM
10. ### urgent stats help

I need some help desperately. I would like to find out whether there is any difference between three conditions using a t test (I dont know if I need...

• Replies: 4
• Views: 1,160
09-02-2013, 01:49 PM
11. ### age distribution - obtaining sample accuracy with unevenly populated dataset

Hi. I'm working on a university research project and want to analyse a dataset but have zero statistics training. The dataset is of several thousand...

• Replies: 0
• Views: 1,409
09-02-2013, 08:49 AM
12. ### [XLSTAT] Get a special 15% discount as a Talkstats member!

XLSTAT is pleased to offer TalkStats members exclusive rates on all orders placed online. Visit www.xlstat.com/en/order and enjoy a 15% discount on...

• Replies: 1
• Views: 6,761
09-02-2013, 06:20 AM
13. ### Which statistic to prove that one data point dominates the proportions in dataset?

I'm very new to statistics so apologies if this is a dumb question. I've got a grasp of the concepts but not real-life usage of them (but I am...

• Replies: 7
• Views: 2,834
09-02-2013, 05:19 AM
14. ### What methods multivariate could I used?

Hello everyone, this is my first post and I need the help of all of you. The problem I have, is that I dont knok what multivariate method could I...

• Replies: 0
• Views: 1,190
09-01-2013, 11:10 PM
15. ### Who is what?

Hi all This is about interpreting the results of statistical tests. I have a case here where I used Mann-Whitney to see how male and female...

• Replies: 4
• Views: 1,457
08-31-2013, 10:59 AM
16. ### Interpreting results of statistical tests; who is what?

Hi all This is about interpreting the results of statistical tests. I have a case here where I used Mann-Whitney to see how male and female...

• Replies: 1
• Views: 1,451
08-31-2013, 02:54 AM
17. ### Random Sampling Over time to make one random sample?

Hello everyone. I have an interesting question that was brought to me by a friend and I do not know the "correct" way to do it. Okay so basically,...

• Replies: 12
• Views: 2,915
08-30-2013, 12:42 PM
18. ### What technique should you use when a model has 2 dependent variables?

I have a model with multiple independent variables that influence a dependent variable. The dependent variable than has an effect on another...

• Replies: 0
• Views: 991
08-30-2013, 12:40 PM
19. ### Wilcoxon rank sum test with binary data

Hello Everybody, Can the Wilcoxon rank sum test be used when the variable of interest is binary? For example, say I have a control group and a...

• Replies: 2
• Views: 3,628
08-30-2013, 01:33 AM
20. ### Help with the Beta Distribtuion

Background: I'm currently trying to learn how to use Bayesian Analysis for split testing two sets of binomial data. (Web analytics, Multi-Armed...

• Replies: 1
• Views: 1,268
08-29-2013, 06:53 PM
21. ### Combining Symmetrized Percent Change (SPC) values

Hello Talk Stats members, I'm relatively new to statistics, so please let me know if I'm off course! I was wondering if a total symmetrized...

• Replies: 1
• Views: 1,453
08-29-2013, 06:16 PM
22. ### average p values???

I have to compare demographics of a study that was s . In the "pre" group, I have 385 patients, in the post...

• Replies: 3
• Views: 2,998
08-29-2013, 06:06 PM
23. ### Linear Regression help :D

Hey guys i was having trouble doing my econometrics homework so i'm going to see if anyone here can help me do this question :D So we have to...

• Replies: 1
• Views: 1,636
08-29-2013, 10:14 AM
24. ### Binary Logistic Regressions

Hello all, I conducted some binary logistic regression analysis for a 'predictors of presence' chapter of my research. However, I've had a...

• Replies: 3
• Views: 1,408
08-29-2013, 09:53 AM
25. ### Stats tests or transformations on data collected on differing dates - Suggestions?

Hello and thanks for reading my post. I have two data sets that I would like to compare, but the data that they each contain were collected on...

• Replies: 0
• Views: 886
08-29-2013, 09:25 AM
26. ### ordinal independent vaues

Hello - I have a set of data which consists of prevalence of a disease as a function of age group: 40-49 years - prevalence is .011 (SE .003)...

• Replies: 0
• Views: 932
08-29-2013, 08:38 AM
27. ### can you do a chi sq w/ 2 different n sizes?

can you do a chi sq w/ 2 different n sizes? I have an experiment with 2 groups (pre medicine and post medicine). Group 1: 400 subjects Group 2:...

• Replies: 1
• Views: 1,357
08-28-2013, 05:51 PM
28. ### equation needed to create a variable for statistical analysis

I would appreciated some help on the following: Skewness in outcomes over mean returns How can I form the above in a correctly statistical/...

• Replies: 0
• Views: 1,278
08-28-2013, 01:40 PM
29. ### Differences between correlation and linear regression

Hi there i want to know the differences between the correlation level of 2 factors and the R^2 adjusted one Thanks!

• Replies: 1
• Views: 1,273
08-28-2013, 08:56 AM
30. ### Computing confidence for multivariant tests

We'd like to compute an overall confidence value for a test with multiple variants (sometimes with no control). We've used Student's and Welch's...

• Replies: 10
• Views: 2,544
08-28-2013, 07:47 AM
31. ### Binary mixed-model logistic regression using lmer() of lme4 for multilevel analysis

In my experiment, each patient has been observed twice, once using placebo and the other time using the real treatment. I want to assess the...

• Replies: 15
• Views: 11,987
08-27-2013, 04:07 PM
32. ### Cox Regression in SPSS - Survival

How do you get to pick your normal comparitive value for a categorical variable with Cox Regression in SPSS? Example: Categorical Variable...

• Replies: 0
• Views: 1,331
08-27-2013, 03:03 PM
33. ### Comparing distributions

Hello, I have five sets of discrete data, built from counting experiments. I'll call this sets n_i(x), with i=1,2,3,4,5 and x a discrete...

• Replies: 0
• Views: 1,120
08-27-2013, 12:18 PM

So i have a review test on monday, and i'm trying to get through these review questions. Unfortunately i have no idea how to do some of these...

• Replies: 2
• Views: 5,700
08-26-2013, 06:37 PM
35. ### Need help with a Statistics Question...

A store manager claims that the average age of his customers is less than 40 years old, while the industry average is 40 years old. He asks you to...

• Replies: 5
• Views: 2,893
08-26-2013, 05:00 PM
36. ### how to identify p-value ranges?

“The p-value is the area under the curve to the right of the F value. The total area under the F-curve is 1.0" I understand that, in concept. And...

• Replies: 1
• Views: 3,429
08-26-2013, 03:39 PM
37. ### Trend and seasonality with dummy variables Minitab

I am doing a statistics course remote and I have some problem with one of my exercises using Minitab. I have a time series over 15 years which...

• Replies: 2
• Views: 4,462
08-26-2013, 12:06 PM
38. ### Test for equality of relative variances amongst multiple samples

The data I have can be summarized with the following dummy values. A first type of populations are sampled, producing the following values: ...

• Replies: 2
• Views: 2,202
08-26-2013, 11:33 AM
39. ### comparing linear models to test for statistical similarities

I am trying to describe plant growth over time using accumulated temperature (dd) as my independent variable and the plants 'growth stage' (gs) as my...

• Replies: 4
• Views: 1,839
08-26-2013, 05:24 AM
40. ### About the meaning of significance in SPSS

Hi, all, I am newbie using SPSS. May be the following question is sort of stupid. But I am trying to sort it out. I do only have high school...

• Replies: 1
• Views: 3,249
08-25-2013, 02:51 PM
41. ### Simple Statistics Review Questions. PART 2

So i have a review test on monday, and i'm trying to get through these review questions. Unfortunately i have no idea how to do some of these...

• Replies: 8
• Views: 2,114
08-25-2013, 01:43 PM
42. ### Serial Correlation when testing for cointegration?

Hello everyone, I am trying to test for cointegration using EG ADF between two variables I(1). The resulting residuals are not stationary and...

• Replies: 0
• Views: 3,077
08-25-2013, 10:06 AM
43. ### compare real count to random samples

Say I have a set of 1470 pairs of peptides. I counted the number of pairs sharing a connection with the same protein and obtained 568. Now I want to...

• Replies: 0
• Views: 804
08-25-2013, 09:26 AM
44. ### Cohen's d, Eta square, and Partial Eta how they are different from each other?

hi plz tell me what is d, η2 and partial η2? how they are different from each other? thanx in advance

• Replies: 6
• Views: 4,784
08-25-2013, 07:34 AM
45. ### Question on binomial confidence intervals bootstrapping

I have a binary (male/female) classification problem, for which I am investigating various methods. The primary result is the per cent classification...

• Replies: 0
• Views: 1,267
08-25-2013, 06:35 AM
46. ### Simulating Prices in Excel

Hi, I came across the following Excel formula to simulate daily stock prices: =Start_Price * (1 + NORMINV(RAND(),0,Daily_Price_Volatility)) ...

• Replies: 1
• Views: 1,146
08-25-2013, 05:37 AM
47. ### De Moivre's Equation The Most Dangerous Equation - Trial of the Pyx

I don't understand the Trial of the Pyx example in the following (http://press.princeton.edu/chapters/s8863.pdf). De Moivre's Equation...

• Replies: 1
• Views: 1,689
08-25-2013, 02:56 AM
48. ### Calculating the size of Type 1 error, Type 2 error and power of the test

Let X have a binomial distribution with parameter n=5 and P\in . The null hypothesis H_{0}:P=\frac{1}{4} is rejected, and The alternative...

• Replies: 3
• Views: 3,510
08-24-2013, 10:26 AM
49. ### Coin tossing simulation in R

I need help with this problem: Toss a fair coin until a head shows up, estimate the expectation of the number of tosses required by simulation....

• Replies: 13
• Views: 5,263
08-24-2013, 10:04 AM
50. ### I need help with statistics homework........Please

Can someone please explain this problem to me.. y=3x-5 The graph of any equation that in the form y=mx+b is a straight line. m=3 and b= -5...

• Replies: 2
• Views: 1,891
08-23-2013, 11:25 AM
51. ### Binomial probability, Binomial test an Chi-squared test - Help

Hi, I made a survey to n people asking their sign (12 signs were available). A number k answered Libra. I want to analyze this result. But I'm...

• Replies: 2
• Views: 1,903
08-23-2013, 05:03 AM
52. ### Min sample size for Wilcoxon Rank Sum test

Hi, I have data measurements (eg, running cost) that keep coming in to the system continuously. There are two groups (say X and Y) that I want to...

• Replies: 5
• Views: 7,821
08-22-2013, 01:00 PM
53. ### Unbiased estimate of cross-product for unbiased vector

Let g be an unbiased estimate of a vector G. Can g be used to find an unbiased estimate of the cross product GG′ (where G' is the transpose of G)?...

• Replies: 0
• Views: 1,390
08-22-2013, 12:54 PM

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