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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,727
09-30-2005, 09:44 AM
2. ### 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: 196,702
07-16-2014, 11:01 AM
1. ### Moved: Minitab?????

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10-31-2006, 12:39 PM
2. ### Moved: need help with Spss

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09-12-2006, 07:39 AM
3. ### Moved: a probability problem

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09-19-2006, 08:17 PM
4. ### Moved: data manipulation

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07-12-2012, 09:45 PM
5. ### Moved: Scatterplot shows little correlation?

Please take a look at the attached scatterplot. Basically, Carbon Monoxide and Traffic Speed was measure 24 hours per day. My sample covers 7...

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01-02-2014, 04:10 PM
6. ### Moved: Spss Help!!!

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11-03-2006, 01:22 AM
7. ### Moved: Can you get me started?

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11-07-2006, 03:42 PM
8. ### Moved: beginner of beginner in stata, help needed

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02-21-2014, 08:54 AM
9. ### 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: 39
10-09-2017, 06:23 AM
10. ### Moved: Homework question. Need Help

The lengths of stay on the cancer floor of Community Hospital were organized into a frequency distribution. The mean length was 28 days, the median...

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02-10-2014, 03:57 PM
11. ### Moved: Coursework help : SPSS box-plot shows just lines, no actual box-plot?

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05-05-2014, 12:13 PM
12. ### 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: 64
Yesterday, 07:17 PM
13. ### 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: 80
10-14-2017, 04:27 AM
14. ### 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: 89
10-10-2017, 08:18 PM
15. ### 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: 89
10-14-2017, 07:55 PM
16. ### 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: 92
10-10-2017, 03:48 AM
17. ### 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: 93
10-14-2017, 09:00 AM
18. ### 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: 95
10-09-2017, 09:25 AM
19. ### 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: 95
10-11-2017, 10:28 AM
20. ### How to find a median of medians? No raw data

0000000000000000000000000000000000000000000000000000000000

• Replies: 0
• Views: 95
Yesterday, 12:20 AM
21. ### 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: 98
10-11-2017, 10:54 AM
22. ### Test for ranked data among 3 different groups - ANOVA or Kruskal Wallis in SPSS?

Hi all, I have read several books but I am not sure if my thinking is correct and would greatly appreciate if someone could help me. I...

• Replies: 0
• Views: 102
08-15-2017, 11:34 AM
23. ### 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: 102
10-15-2017, 04:35 PM
24. ### 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: 103
10-11-2017, 02:35 PM
25. ### 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: 106
10-14-2017, 06:44 AM
26. ### 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: 106
10-12-2017, 04:14 AM
27. ### 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: 123
09-30-2017, 02:49 AM
28. ### 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: 124
10-07-2017, 09:00 AM
29. ### 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: 0
• Views: 127
10-02-2017, 02:37 PM
30. ### 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: 129
10-11-2017, 10:26 AM
31. ### Online Travel Industry in China

Hi All, I need to forecast market size for online travel industry in China. Let me know possible way out.

• Replies: 0
• Views: 130
09-28-2017, 02:33 AM
32. ### 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: 132
10-12-2017, 12:45 PM
33. ### 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: 132
10-16-2017, 04:20 PM
34. ### 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: 1
• Views: 134
10-16-2017, 01:55 AM
35. ### 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: 136
10-10-2017, 02:09 AM
36. ### 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: 138
10-14-2017, 03:08 AM
37. ### 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: 142
10-11-2017, 02:00 AM
38. ### 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: 143
10-01-2017, 11:06 PM
39. ### 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: 144
10-03-2017, 05:22 AM
40. ### How do I calculate the variance of the ratio of two independent variables?

If I have two independent variables (say X and Y) with their respective variances (or standard deviation), how could I calculate the mean and...

• Replies: 1
• Views: 145
09-22-2017, 09:39 AM
41. ### 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: 146
09-30-2017, 03:01 AM
42. ### How do I pose a hypothesis for a partial correlation?

Hello everyone, in my thesis I have following hypothesis: 3a: Internet skills are positively correlated with the frequency of experiencing risks...

• Replies: 0
• Views: 146
09-22-2017, 02:01 AM
43. ### Choosing prior for the regression coefficients in the logistic regression

I'm trying to model Bayesian logistic regression model (using JAGS in R) with my dependent variable (status: 0=alive, 1 death) & independent variable...

• Replies: 2
• Views: 146
09-26-2017, 08:46 AM
44. ### 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: 146
10-07-2017, 08:28 AM
45. ### Counting stats and percentages (with a backstory)

Greetings all, first of all, let me preemptively apologize for my extremely rudimentary and crude terminology as it pertains to statistics. I'm a...

• Replies: 0
• Views: 147
09-27-2017, 05:49 AM
46. ### 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: 151
10-05-2017, 11:41 AM
47. ### what type of ANOVA should I use?

population =30 Breaking it down Number of male participants =20 Number of Female Participants = 10 Number of Working Participants(W) = 8...

• Replies: 1
• Views: 155
09-26-2017, 06:07 PM
48. ### 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: 158
10-01-2017, 04:57 PM
49. ### Nervous breakdown trying to analyse PsychoPy data. Help appreciated.

Hi, I am at breaking point :shakehead I need to analyse data in SPSS from a stop signal task but there are almost 1000 trials per participant (2...

• Replies: 1
• Views: 161
09-28-2017, 05:03 AM
50. ### Summation Algebra

Hi guys, new member :D: Here is the question I'm having trouble with: I was having trouble with this as I haven't taken stats in years....

• Replies: 0
• Views: 164
09-24-2017, 02:24 PM
51. ### 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: 165
10-04-2017, 09:58 PM
52. ### 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: 166
10-07-2017, 11:16 AM
53. ### 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: 167
10-01-2017, 10:26 AM
54. ### Statistical test and error bars?

Hi! I'm completely new to statistics so I'm a bit stuck! I'v been treating 4 groups of human cells (all originally from the same batch) with...

• Replies: 1
• Views: 168
09-20-2017, 02:38 PM
55. ### Help - How do you calculate Z scores given mean and standard deviation?

I need to calculate z(obs) when given mean and standard deviation from a population and one sample, as in μ0 =32, σ0 =10, m=27, and n=25, assuming...

• Replies: 2
• Views: 169
09-24-2017, 10:07 PM

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