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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: 197,262
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: 67,029
09-30-2005, 09:44 AM
1. ### A few questions from a sample final that have my mind boggled.

As many of you know, it's finals time at many schools around the nation. I am currently enrolled in a Stats class, and it has to be one of the most...

• Replies: 0
• Views: 2,170
12-11-2012, 01:50 PM
2. ### 3^2 factorial design, just one treatment with replicas, help?

Hello al! I would appreciate if you could help me, I have this experiment with two factors, every factor with 3 levels, so in total there are 9...

• Replies: 0
• Views: 827
12-11-2012, 08:25 AM
3. ### Strongly unbalanced small sample size BUT significant difference....???

Hi all, A colleague had conducted a two sample t-tests assuming unequal variances with samples of size 22 and 7 (the data is really hard to...

• Replies: 4
• Views: 2,325
12-11-2012, 07:44 AM
4. ### repeated measure with unequal repeats for each subject

We want to do a repeated measure study. we have some patients who Swallow a kind of Tablet for their disease. We call this times tg-on But if their...

• Replies: 0
• Views: 981
12-11-2012, 07:32 AM
5. ### Linear Regression

Problem: Let W & Q be two random variables such that E=5, sd(W)=1 E=10, sd(Q)=2 rho=0.2 Assume that the joint distribution of (W,Q) is...

• Replies: 0
• Views: 1,357
12-11-2012, 02:01 AM
6. ### Independent Binomial random variables, MLE of px and py

Let X and Y be independent Binomial random where X~B(Nx, px) and Y~B(Ny,py), where Nx and Ny are known and px and py are unknown. (a) Suppose...

• Replies: 14
• Views: 2,479
BGM
12-10-2012, 10:28 PM
7. ### Series - Variations between 2 dates

Dear All, I’ m trying to solve the following problem: Date 1. Y= (A+B+C)/(D+E+F) Date 2. Y= (A+B+C)/(D+E+F) How can I perform an...

• Replies: 0
• Views: 699
12-10-2012, 07:00 PM
8. ### Offset variable in GWPR

Hi, I am using a Geographically Weighted Poisson Regression (GWPR) but having issues selecting the the offset variable. I am exploring the...

• Replies: 0
• Views: 872
12-10-2012, 04:14 PM
9. ### Simple experiment...but confused about analysis...

For a class, we had to create a simple completely randomized experiment to investigate some topic. We chose to see if caffeine actually makes people...

• Replies: 5
• Views: 1,573
12-10-2012, 02:53 PM
10. ### Risk Factors in a Clinical Trial

The study is confidential right now. So I cannot go into the details. But will try to detail every necessary information, in the hope that can get...

• Replies: 6
• Views: 1,931
12-10-2012, 11:12 AM
11. ### Mean Reversion

I have been given a Geometric Brownian Motion, with parameters \mu_{*} and \sigma ^{2}_{*}, meaning i can write; d S_{t} = \mu_{*} S_{t} dt +...

• Replies: 1
• Views: 1,142
BGM
12-10-2012, 08:01 AM
12. ### conjoint analysis

hello my dear friends i do conjoint analysis in my thesis for underestanding consumer preferences in purchasing machinery carpet with spss. i...

• Replies: 0
• Views: 1,287
12-10-2012, 07:56 AM
13. ### Name that scenario

Name that Scenario: I need help choosing the analysis technique most appropriate for each question. THANKS! A: Survey of 1000 people in a large...

• Replies: 1
• Views: 4,770
12-10-2012, 01:07 AM
14. ### Logistic regression or GLM?

Hi everyone: I have a question about using logistic regression or GLM with only categorical variables as independent variables. The dependent...

• Replies: 6
• Views: 2,229
12-09-2012, 11:09 PM
15. ### T test versus Z test

Hi, I have a pretty basic question 9but havne't been able to find the answer through the search function). Basically, I want to know why in...

• Replies: 2
• Views: 4,101
12-09-2012, 10:30 PM
16. ### This is not homework! It is a binomial distribuitoin question on the study guide.

At a recent faculty party there were 8 philosophers, 5 psychologists, and 6 physicists, all noted for their love of the (fermented) grape (and...

• Replies: 0
• Views: 2,475
12-09-2012, 10:27 PM
17. ### unbiased estimator for 1/p of geometric distribution

Suppose X is a random variable with geometric distribution, and parameter p, 0<p<1, how do you find a statistc that is unbiased estimator of 1/p? Do...

• Replies: 16
• Views: 19,308
12-09-2012, 10:11 PM
18. ### One way ANOVA or repeated measures one way ANOVA??

My study is looking at six different drug delivery devices. So, there will be six groups with 15 animals in each. The study is going to last 100 days...

• Replies: 1
• Views: 1,406
12-09-2012, 09:51 PM
19. ### Normal Distribution

The daily dinner bills in a local restaurant are normally distributed with a mean of $28 and a standard deviation of$6. a. What is the...

• Replies: 1
• Views: 3,435
12-09-2012, 05:15 PM
20. ### type 1, type 2 error question

The latest in the “You may be a redneck if . . . ” genre has produced a simple questionnaire. If more than 80% of the questions are answered in...

• Replies: 1
• Views: 1,496
12-09-2012, 04:24 PM
21. ### z-test question

• Replies: 0
• Views: 1,019
12-09-2012, 03:30 PM
22. ### Interpretation of a Q-Q plot and Shapiro-Wilk test

I have the following output from a shapiro-wilk test: Shapiro-Wilk normality test data: goalTime W = 0.9486, p-value = 0.05751 And the Q-Q plot...

• Replies: 3
• Views: 8,372
12-09-2012, 10:06 AM
23. ### High covariance between two factors. Is that a problem in a regression?

Hi, Is it problematic if there is a very high covariance between two factors (independent latent variables) (0.95 standardized). I thought the...

• Replies: 3
• Views: 2,902
12-09-2012, 06:58 AM
24. ### Causal stats with one event and multiple time series?

Hi all, I have computed causal relationships between two time series. But now I would also like to check the causal influence of a single event on...

• Replies: 0
• Views: 1,047
12-08-2012, 10:54 PM
25. ### Referent Group

Hello, I have a question about the reference group for one of my variables. Say I have “insurance” as a categorical variable, with 4 levels:...

• Replies: 5
• Views: 1,981
12-08-2012, 12:19 PM
26. ### Statistical analysis of Profits - use of U-test

Hi We have been working on a project where we have 2 or more trading agents on a market stock and for the outcome we have the profits that each...

• Replies: 7
• Views: 2,041
12-08-2012, 03:12 AM
27. ### the difference between non-stationary data and random data?

what are the the difference between non-stationary data and random data? If we detrend a stationary data and make it non-stationary what will happen,...

• Replies: 1
• Views: 2,205
BGM
12-08-2012, 12:11 AM
28. ### Finding troughs in a time series data

Hi, I have a time series data that looks like below (T1, T2, etc indicate linear time intervals):...

• Replies: 1
• Views: 1,047
12-07-2012, 02:45 PM
29. ### Regression Coefficient Help

Hello, Thanks in advance for the help everyone, I'm new to this site and I really appreciate it. I am currently working on some research and...

• Replies: 10
• Views: 2,225
12-07-2012, 01:40 PM
30. ### Estimate of σ^2 (variance of Y in regression)

Hello, everyone, I have a question about the regression. The textbook said, the mean-square regression term (SSY-SSE) provides an estimate of σ^2...

• Replies: 0
• Views: 36,137
12-07-2012, 11:12 AM
31. ### correspondence between confidence interval or hypothesis testing

If the confidence intervals for two proportions do overlap this does not necessarily mean that the statistical test for the difference will be...

• Replies: 3
• Views: 2,728
BGM
12-07-2012, 06:06 AM
32. ### Chi test and regression

Hello everybody I have to test whether there is a significant difference between two groups. I want to indicate that among the two groups are no...

• Replies: 18
• Views: 3,388
12-07-2012, 03:23 AM
33. ### What statistical test would I use for this?

I was thinking of a chi square to assess this situation. What does everyone think? In centres with an active mental health program a higher...

• Replies: 0
• Views: 1,597
12-07-2012, 12:00 AM
34. ### Determining sample dependence

How do you determine if samples are independent? I know that test scores of two separate groups of students are independent. Before-and-after...

• Replies: 1
• Views: 1,236
12-06-2012, 11:38 PM
35. ### How to study for a statistics exam ?

I have just completed my first ever statistics paper and passed...but not to my satisfaction (really wanted to do better :mad:) I have taken on...

• Replies: 1
• Views: 2,816
12-06-2012, 10:50 PM
36. ### Binomial Distribution

Imagine that the probability of answering this question correctly is only p = .4, and on tests in which it is used, only 8 people attempt it. On what...

• Replies: 3
• Views: 1,299
12-06-2012, 10:04 PM
37. ### Null Hypothesis help

Hi would love some help on this, stats is all new to me. Question is Test the null hypothesis that the true mean yield if 5000kg (alpha = 0.05) I...

• Replies: 2
• Views: 1,287
12-06-2012, 07:50 PM
38. ### How to check association between an interval variable & nominal variable?

There is a collection of data of 2000 patients. I want to know the age of onset of Diabetes (an interval variable) has any relationship to the...

• Replies: 9
• Views: 7,352
12-06-2012, 07:30 PM
39. ### Longitudinal Data Analysis- Best analysis for given data

Greetings, I am conducting a study with 80 companies and looking at aggregated perceptions of employees for the DV (continuous variable). The IV...

• Replies: 1
• Views: 1,063
12-06-2012, 06:55 PM
40. ### Is there an ANOVA equivalent of a paired t test?

Hello, I am trying to analyse the results of subjects before and after a treatment. There are three treatments, and each subject is subjected to...

• Replies: 3
• Views: 5,374
12-06-2012, 06:23 PM
41. ### How to analyse the following matched data?

Hi all, I have a question that needs analysing that looks like this: 1) There is a pre and post intervention response (two separate surveys) to...

• Replies: 2
• Views: 1,503
12-06-2012, 06:00 PM
42. ### Estimation model for White noise process

Hi !!! I have a question about time series (again :p). I want to analyze the correlation between two series. I ran some tests and it appears that...

• Replies: 5
• Views: 1,819
12-06-2012, 04:40 PM
43. ### Calculating class rank based on distribution of individual grades

Hi I am trying to calculate my class rank, which my school does not provide. I have searched extensively on Google and on this forum, without...

• Replies: 0
• Views: 2,186
12-06-2012, 03:20 PM
44. ### Convert to Reandom Variables- Time Series Analysis

Hi, I have a set of water quality data that are not random but I want use them in a Copula model so I should have random variables (I know it can...

• Replies: 5
• Views: 1,537
BGM
12-06-2012, 03:03 PM
45. ### Modeling my data, will ANOVA suffice?

Helly everyone, I have 12 animals, divided in three groups (all n=4). Group A received two treatment doses (0.8 followed by 1.6), group B received...

• Replies: 0
• Views: 978
12-06-2012, 11:34 AM
46. ### Sampling from N data points based on a given probability distribution

I have N data points, and each data points is associated with a probability. The sum of the N probabilities equals to one. I need to sample these N...

• Replies: 1
• Views: 1,657
BGM
12-06-2012, 03:26 AM
47. ### Help needed with cotton experiment

Hello all! First time visitor/poster. . . I am needing your help with determining the statistical significance of a cotton variety trial that I...

• Replies: 11
• Views: 1,548
12-06-2012, 02:20 AM
48. ### Significance test for percentages

Hi everyone I need to compare percentage composition of different groups and determine if groups significantly differ. Example: Election...

• Replies: 8
• Views: 4,021
12-05-2012, 05:22 PM
49. ### Help Choosing Tests

Hello All, I'm currently writing my dissertation proposal, and I'm a bit confused on the statistics. For my research, I'm looking at two groups...

• Replies: 2
• Views: 1,406
12-05-2012, 04:15 PM
50. ### Am I correct to use a t-test?

I'm trying to plan a research paper, but I have no experience with statistics and would appreciate advice as to the kind of test i should be using....

• Replies: 1
• Views: 1,666
12-05-2012, 03:53 PM
51. ### Profile analysis vs MANOVA

Hi everyone! I am quite new here so if I hope that my question will make sense: I can't understand why should I use profile analysis instead of...

• Replies: 0
• Views: 1,542
12-05-2012, 05:02 AM
52. ### Correlation test with multiple X values for every Y value

Hi all, For a university project, I want to run a correlation test between some variables to test some hypotheses. The real domain is a bit...

• Replies: 0
• Views: 1,610
12-05-2012, 01:59 AM
53. ### Chance of making 50% of the profit

Ok, Just a basic question (numbers are random). If my profit is $150 and standard deviation is$20. What is the chance of making 50% of the expected...

• Replies: 0
• Views: 1,234
12-04-2012, 02:08 PM
54. ### two way analysis

I have data for 1970 and 1980 parity ratios, Parity 0 1 2 3 4 5 British 0.879 0.797 0.558 0.484 0.480 0.531...

• Replies: 2
• Views: 1,890
12-04-2012, 01:47 PM
55. ### Exogenous Regime Switching

I currently have a model that measures inflation expectations as follows: y(t) = a*x(t) + (1-a)*y(t-1) I'm looking to create a regime switching...

• Replies: 0
• Views: 1,058
12-04-2012, 09:30 AM
56. ### Data Hygience

I get government data from time to time, and some of the fields that I expect to only contain numerical data also contain text explaining why the...

• Replies: 6
• Views: 1,771
12-04-2012, 12:34 AM

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