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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: 197,032
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: 66,893
09-30-2005, 09:44 AM
1. ### It's posible to compare two means without considering standard deviations?

My doubt is the following 'it's possible to compare means of two independent groups without considering standard deviations" ? For example: ...

• Replies: 0
• Views: 7
Today, 11:21 AM
2. ### Is it OK to analyze all measures as independent data in paired dataset

I have data from triple-crossover study. Same patients received a drug in the morning then in the noon then in the evening and different parameters...

• Replies: 0
• Views: 35
Today, 03:12 AM
3. ### R, need help setting up my contrast

I have a problem that provides litter types (M, Mix, MM) and weights. It asks me to conduct a planned comparison and test whether M>mix>mm. I...

• Replies: 0
• Views: 60
Yesterday, 09:53 PM
4. ### Can someone please confirm if I have selected the right tests for hypothesis testing?

Hi, this is my first post here, hope that I'm doing this correctly! I'm taking a statistics course for my master's where we need to do some...

• Replies: 0
• Views: 68
Yesterday, 12:43 PM
5. ### Repeated measures 2x3 design on SPSS

My data has two factors. Factor 1 has 2 levels and Factor 2 has 3 levels. ie a 2x3 design. Right? The study is within-subjects. So on SPSS, I...

• Replies: 3
• Views: 205
Yesterday, 01:48 AM
6. ### Appropriate Bonferroni correction

I'm comparing two groups of patients using several 3x2 and 4x2 contingency tables (for different sublevels of chemotherapy for instance). Question is...

• Replies: 1
• Views: 81
10-19-2017, 10:49 AM
7. ### Log-rank test appropriate?

Hello, I am currently working on a small (29 patients) retrospective analysis of patients undergoing a certain treatment. One of the main...

• Replies: 2
• Views: 170
10-19-2017, 10:46 AM
8. ### Choosing the right winsorizing method for outliers

So far, I've only been able to find references to 2 methods for winsorizing outliers: 1) substituting the outlier for the next higher or lower...

• Replies: 0
• Views: 58
10-19-2017, 07:31 AM
9. ### Not Sure which statistical tests) to use

Hello everybody, Hope you all are doing well. We have collected some data from students at our medical college. We asked students to complete...

• Replies: 7
• Views: 370
10-18-2017, 12:53 AM
10. ### MAPE - Split out the positive and negative results?

Hi there, New to statistics, would appreciate any advice you can give :) Doing forecast accuracy, and looking at using MAPE. I have data...

• Replies: 0
• Views: 107
10-17-2017, 07:17 PM
11. ### How to find a median of medians? No raw data

0000000000000000000000000000000000000000000000000000000000

• Replies: 0
• Views: 122
10-17-2017, 12:20 AM
12. ### Binomial expectation E(X|X>1)

General case: X~B(n,p) I could integrate the product of x and pmf from 1 to infinity and divide it by the integral of just pmf from 1 to infinity...

• Replies: 1
• Views: 160
10-16-2017, 04:20 PM
13. ### Youden’s J

Hello, I have a little question about interpretation of Youden’s J. I have three different J values (0.23, 0.26, 0.28) for three different...

• Replies: 1
• Views: 116
10-15-2017, 04:35 PM
14. ### Error: 759 in NLOGIT software

Hi all: I'm trying to estimate a simple logit model following Berry (1994)'s linearization approach to then calculate the demand elasticity based...

• Replies: 0
• Views: 102
10-14-2017, 07:55 PM
15. ### P values from 95% CI using poisson distribution

Hi, Hope I'm in the best place for an answer :) I have a study across 10 years. I have an incidence rate that was calculated for each year along...

• Replies: 0
• Views: 116
10-14-2017, 09:00 AM
16. ### Logistic Regression

Let’s consider the logistic regression model, which we will refer to as Model 1, given by log(pi / ) = 0.25 + 0.32*X1 + 0.70*X2 + 0.50*X3 In the...

• Replies: 2
• Views: 122
10-14-2017, 06:44 AM
17. ### Need help with a theoretical question

Here is the question: How does the return distribution relate to the normal distribution if the return horizon becomes longer? :yup:

• Replies: 0
• Views: 97
10-14-2017, 04:27 AM
18. ### Quartiles

Hi,i am confused regarding the formula to calculate quartiles: eg, data set (sorted): 2, 2, 3, 3, 3, 5, 7, 9 (n=8) for lower quartiles the...

• Replies: 2
• Views: 147
10-14-2017, 03:08 AM
19. ### model a sample

Please help to simulate a sample. simulate a sample of independent observations of a volume 10 having a chi distribution of a square with 6 degrees...

• Replies: 1
• Views: 143
10-12-2017, 12:45 PM
20. ### Logistic Regression

Let’s consider the logistic regression model, which we will refer to as Model 1, given by log(pi / ) = 0.25 + 0.32*X1 + 0.70*X2 + 0.50*X3 In the...

• Replies: 0
• Views: 123
10-12-2017, 04:14 AM
21. ### Best way to test if method of count estimation is appropriate?

So, working through some data where I have to essentially count the number of particles in each replicate. Unfortunately, sometimes there are so many...

• Replies: 0
• Views: 107
10-11-2017, 02:35 PM
22. ### Properties of two subsets of the wealth distribution

Hello, Consider an arbitrary wealth distribution over a large (possibly infinite) set I of individuals. An individual i has wealth wi. Total...

• Replies: 0
• Views: 107
10-11-2017, 10:54 AM
23. ### What does it mean if my Pearson r correlation is not significant?

Hi there, So ive got a sample size of 400 Uni students, measuring a correlation between stress and exercise levels in minutes, and I received a...

• Replies: 2
• Views: 99
10-11-2017, 10:28 AM
24. ### Standard Deviation, Average +/- or Something Else?

Hi everyone, I don't have a background in stats, but I'm trying to solve a stats problem. For each year we try to predict what percentage we will...

• Replies: 1
• Views: 141
10-11-2017, 10:26 AM
25. ### Confidence Intervals: Sample proportion and margin of error

I'm just starting to learn statistics, and I apologize for the likely simple questions I'm asking, but they have me frustrated and I'd like to...

• Replies: 4
• Views: 146
10-11-2017, 02:00 AM
26. ### Calculating new Mean and Variance after observation removal

I have a random sample of 15 observations and the sample mean is 11.2 and the sample variance is 13.4 but one of the observations of 21.2 was...

• Replies: 0
• Views: 93
10-10-2017, 08:18 PM
27. ### Clarify this explanation of why we use d.f.?

I have read some variant of this explanation of d.f.'s many times - I'll quote the latest one that I read: This explanation would make more...

• Replies: 7
• Views: 265
10-10-2017, 03:09 PM
28. ### Hypothesis testing

Hello Everyone, I am new here so I do not really know where to start, but not ashamed to ask for directions. I am trying to develop a model in...

• Replies: 0
• Views: 105
10-10-2017, 03:48 AM
29. ### Question about intercept and slope p value matter?

Im doing my research about event study. I used Market Model, with OLS regression to find out expected return. I found some companies as follow : ...

• Replies: 3
• Views: 152
10-10-2017, 02:09 AM
30. ### Bayes - need help informing priors

Hi! Anyone here familiar with Bayesian inference? I would like to inform priors for an analysis. I have Odds Ratios and 95% CIs. How would I...

• Replies: 8
• Views: 284
10-09-2017, 06:41 PM
31. ### McGraw-Hill red books

is anyone familiar with the red book series, psych and stats? respond here for further information and question thanks joe

• Replies: 0
• Views: 108
10-09-2017, 09:25 AM
32. ### A question about using Generalized estimating equations (GEEs)

Dear All, I have a question regarding using GEEs to test some of my mating system data (the temporal and spatial proximity of males in regard to a...

• Replies: 0
• Views: 43
10-09-2017, 06:23 AM
33. ### STATISTICS EASY PROBLEM help

how many ways can you arrange a 3 digit number if first number cant be 0 and no numbers can be repeated. My guess is 9*8*7 which equals 504. BUT...

• Replies: 2
• Views: 217
10-08-2017, 08:36 PM
34. ### Goodness of Fit Test for a small sample size with 4 categories

Hello, I had a group which did 4 different types of training. There were N=16 participants. After completion of the training, they were asked...

• Replies: 2
• Views: 174
10-07-2017, 11:16 AM
35. ### finding moments about the origin,

I am solving a problem in moments and find Bheta1 , Bheta2 but unable solve moments about (i) the origin, and (ii) the point x = 2. 4 moments are as...

• Replies: 0
• Views: 132
10-07-2017, 09:00 AM
36. ### How would you solve these questions? Time series

Question 1 For the AR(3) process, xt = 0.6xt−1 − 0.4xt−2 + 0.4xt−3 find the values of the autocovariance function γ(1) and γ(2) ...

• Replies: 1
• Views: 166
10-07-2017, 08:28 AM
37. ### F-distribution and T-Distribution

I have this questions from my test. Can you please help... State True or false 1.The test statistic for the difference of population variance...

• Replies: 3
• Views: 185
10-06-2017, 01:39 PM
38. ### Probability of the correct diagnosis in a lie detector

Probability of the correct diagnosis in a lie detector A lie detector correctly diagnoses 90% of those who lie (M) and 95% of those who do not lie....

• Replies: 1
• Views: 171
10-05-2017, 11:41 AM
39. ### Books for Stats

Hi All I am doing the MBA program. We have stats in our syllabus. I have strong mathematics background, however, I am not finding enough books to...

• Replies: 3
• Views: 172
10-04-2017, 09:58 PM
40. ### Interpreting histogram

Thank you!

• Replies: 5
• Views: 202
10-03-2017, 05:39 PM
41. ### Question about conditional odds ratio

I have a question about the definition of a conditional odds ratio (COR). Let's assume a very simple scenario of three binary variables Y,X and Z....

• Replies: 3
• Views: 213
10-03-2017, 12:05 PM
42. ### Several test groups and one big control group: split the group or not?

Dear members I'm preparing a test of proportions regarding a campaign redemption of several groups which have all common "demographics" but have...

• Replies: 2
• Views: 152
10-03-2017, 05:22 AM
43. ### tests of agreement between diagnostic tests

I need to assess agreement between to variables. The problem is that one of the variable is a continuous variable and the other is a categorical...

• Replies: 3
• Views: 191
10-02-2017, 12:41 PM
44. ### What study type it is

I'm measuring expression of a particular gene and comparing it between 30 diseased patients and 15 healthy controls of similar age and sex. I...

• Replies: 1
• Views: 226
10-02-2017, 01:20 AM
45. ### Help me to choose right statistical method

Hello everyone!! I have two sets of data for last 10 years and what I am trying is to prove which set of data is increasing continuously in recent...

• Replies: 0
• Views: 159
10-01-2017, 11:06 PM
46. ### Energy comsumption data

Hi, I have some data on 5000 odd households. It contains energy consumption readings in kwh every half an hour. How would I be able to estimate...

• Replies: 1
• Views: 171
10-01-2017, 04:57 PM
47. ### Moderation analysis assumptions and how to control them

Dear all, I am trying to do moderation analysis with Lisrel and working on my data set on SPSS. Can anyone share the assumptions of moderation...

• Replies: 3
• Views: 183
10-01-2017, 10:26 AM
48. ### Comparing two populations variance

I have been doing questions like the following by hand with a calculator Find the best point estimate for the ratio of the population variances...

• Replies: 4
• Views: 282
09-30-2017, 08:54 PM
49. ### Dummy variables and their interaction (urgent help required)

Dear All, I have a question concerning the dummy and dummy interactions. Firm Performance is a continuous variable (variable of interest) and...

• Replies: 3
• Views: 157
09-30-2017, 03:01 AM
50. ### Equal or Unequal Samples when comparing more than two means? Does that matter?

I am going to conduct a study in which I'm going to analyse the mathematical performance of indigenous students in school A and will be compared to...

• Replies: 0
• Views: 131
09-30-2017, 02:49 AM
51. ### What statistical approach shoud I use in this data?

Given there are students who answered the survey. About 30 students who answered. I cant see. To use t-test or anova here hmmm what should I use to...

• Replies: 2
• Views: 236
09-28-2017, 06:01 AM

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