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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: 0
• Views: 23,469
11-27-2010, 11:13 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: 19,443
09-30-2005, 09:44 AM
1. ### Different results between GraphPad Prism 5.0 and PAWS 18.0

Hi, I have done a pairwise comparison of groups using Dunn's post-test in Prism, following a result of significant differences using a...

• Replies: 1
• Views: 632
07-23-2011, 08:10 PM
2. ### Time Series: stationary AR(1) -> MA(infinity)

Theorem: A stationary AR(1) model can be expressed in terms of MA(infinity). Proof: Now I don't understand how they get from the second last...

• Replies: 3
• Views: 1,264
07-23-2011, 08:47 AM
3. ### Distribution of coefficients in regression

When I get the regression equation y = a.x + b by regressing y on x, how do I find and plot the distribution of a?

• Replies: 4
• Views: 685
07-23-2011, 03:25 AM
4. ### Pearson r and Data

I am trying to determine the relationship of scores on a test between teachers and their students. I have 40 classes for a total of 40 teachers and...

• Replies: 1
• Views: 517
07-23-2011, 02:50 AM
5. ### Questions about standard deviation and the mean

I have a problem I am trying to figure out. Basically, a gym lists a random sample of the # of times a guest has visited in a 1 month period (12, 19,...

• Replies: 5
• Views: 1,725
07-22-2011, 10:11 PM
6. ### Request for help in statistical analysis

Hi all, I am new to this forum. I have been doing a market survey for a product as a part of MBA thesis where respondents are categorised into 4...

• Replies: 2
• Views: 372
07-22-2011, 03:07 PM
7. ### Degrees of Freedom

Hi, I have tried to explain the concept of degrees of freedom as I couldnt find a satisfactory explanation of this concept on the internet anywhere....

• Replies: 0
• Views: 393
07-22-2011, 07:11 AM
8. ### One-way ANOVA, how much unbalance is too much?

Hello, I am using one-way Model II ANOVA with the following group sizes: 15, 16, 34, 14, 10 for sample A. Maximum contrast = 34/10 = 3.4. 14,...

• Replies: 0
• Views: 440
07-22-2011, 12:07 AM
9. ### Simple statistical help

Hello, I am in desperate need of some help with some (what I am hoping to be) very simple statistical analysis for someone that has experience. I am...

• Replies: 0
• Views: 294
07-22-2011, 12:03 AM
10. ### Graphical Representation of large data

Hi, I am a stats newbie. I have to show how 150 variables vary across 13 groups using a graphical representation. Using the usual graphical...

• Replies: 3
• Views: 1,009
07-21-2011, 04:47 PM
11. ### How to test when series of data becomes not significant...

Hello, I am trying to figure out what test to use in order to solve a fairly basic concept. I am not sure if this is a cenvergence test or a...

• Replies: 8
• Views: 623
07-21-2011, 09:42 AM
12. ### How calculate intercept with multiple regression

I am familiar with calculating the intercept, etc for a regression equation, but I am confused as to how to calculate the intercept when using...

• Replies: 14
• Views: 7,981
07-21-2011, 07:39 AM
13. ### Help with British Household Panel Survey data

Hi all, I'm not sure if anyone else ever worked with data from the British Household Panel Survey (I understand that this is a really specific...

• Replies: 0
• Views: 372
07-21-2011, 02:36 AM
14. ### Simpson's diversity index - comparing 2 sites

I need to compare the Simpson's Diveristy Index of 2 sites. For each site I have collected beetles using pitfall traps - 20 traps per site. Using...

• Replies: 9
• Views: 5,168
07-21-2011, 12:47 AM
15. ### Random variables and discrete distributions Homework help

Sorry to bother you guys but I've been stuck with my stats homework for the past several hours :mad: I'm stuck at the last part of these two problem...

• Replies: 0
• Views: 562
07-20-2011, 08:29 PM
16. ### Logistic regression, interactions

I am having a nightmare and unfortunately my supervisors cannot figure this out either! I have an equation from logistic regression, of which the...

• Replies: 2
• Views: 479
07-20-2011, 03:09 PM
17. ### ANCOVA question

Hi All ... Why is it that the corrected model in an ANCOVA has a different value than the DP for an ANOVA? (I just know that sounds stupid). ...

• Replies: 6
• Views: 978
07-20-2011, 12:27 PM
18. ### Reports Dynamically

Is there any statistical tool by which we can generate reports dynamically? I will explain in detail. In case of SPSS, if i did an...

• Replies: 0
• Views: 302
07-20-2011, 05:08 AM
19. ### Splitting a sample

Ok, so please forgive me in advance, I'm not a stats expert, but I do sampling as part of my function as an auditor. I'm trying to develop a new and...

• Replies: 4
• Views: 466
07-19-2011, 05:35 PM
20. ### Weird Question

What type of model does not contain an error term and gives an exact relationship between the variables.. Deterministic regression model...

• Replies: 3
• Views: 1,553
07-19-2011, 01:33 PM
21. ### calculate the average of the standard error?

Hi Folks, I have two estimates that I would like to average: N1 = 68.7 (SE = 13.6) N2 = 81.6 (SE = 15.5) Average N = 75.2 (SE = ?). Can...

• Replies: 2
• Views: 6,883
07-19-2011, 11:59 AM
22. ### what shall I learn in order to understand logit models?

Hello, I am an accounting student. i only did a unit in statistics covering basic topics such as basic probability, discrete probability...

• Replies: 9
• Views: 1,207
07-19-2011, 02:54 AM
23. ### Significance Test for Experiment

Hi, I recently did a survey where I had to survey the same people once a week for four weeks. Basically most of my questions involved ordinal...

• Replies: 2
• Views: 752
07-18-2011, 06:17 PM
24. ### tending to infinity of standard deviations

hi guys, i have a question puzzling me: if x tends to infinity based on some function (where x is a number) , does it imply that the standard...

• Replies: 5
• Views: 969
07-18-2011, 08:22 AM
25. ### Help with some quick stats questions

The course reading isn't too great on this topic, so I was hoping to get some quick help. The question: Suppose 0<P(A)<1 and 0<P(B)<1. If B...

• Replies: 1
• Views: 449
07-18-2011, 08:21 AM
26. ### help with question about how to get the probability

I am reading a book which said the following: This client probably has 100,000 pieces of data in their system at any one time and books 10% of ...

• Replies: 0
• Views: 346
07-18-2011, 03:21 AM
27. ### Stats question

Hi there, I have data for a year for the amount of emissions released from electricity generation. I have time stamps and values. How can find...

• Replies: 0
• Views: 306
07-18-2011, 03:17 AM
28. ### Sampling Technique for email survey

HI, I need help in determining whether a survey of subscibers to a specific product is a probability technique or non probability sampling technique....

• Replies: 1
• Views: 456
07-17-2011, 10:00 AM
29. ### sample size determination using a population range

Hi. I have a problem about sample size determination. The population of interest is somewhat vague. What I know about the population is only...

• Replies: 2
• Views: 943
07-15-2011, 10:16 PM
30. ### Help With Stats Homework! Hypothesis Testing

NVM...I fund what I needed.

• Replies: 4
• Views: 669
07-15-2011, 09:02 PM
31. ### Non-parametric hypothesis test comparing horizontal difference between two samples.

Hi, May I happen to know which kind of non-parametric hypothesis tests can compare the horizontal difference between two samples in the pertaining...

• Replies: 0
• Views: 658
07-15-2011, 07:47 AM

An orange juice producer buys all his oranges from a large orange orchard. The amount of juice squeezed from each of these oranges is approximately...

• Replies: 6
• Views: 1,989
07-14-2011, 12:34 PM
33. ### Contrasts in R for two-way and three-way interactions

I am new to using R and have just performed some mixed effect models which have significant 2-way and 3-way interactions. My question is now that I...

• Replies: 8
• Views: 3,048
07-14-2011, 07:31 AM
34. ### How can i get online sales statistics?

I am new member and would like to do online business.I am looking to setup an online store and as part of my initial research i need to get some...

• Replies: 0
• Views: 381
07-14-2011, 05:33 AM
35. ### Choosing test involving Pre/Post test with control group

I am having trouble choosing what test to compare means. My dependent variable is an interval variable. I have two groups of people, control and...

• Replies: 0
• Views: 791
07-13-2011, 02:36 PM
36. ### t-test on geometric means?

I have 2 groups of dilutions (titres) that I would like to compare. The thing is, the mean for titres is usually the geometric one so I feel that I...

• Replies: 1
• Views: 1,838
BGM
07-13-2011, 01:30 PM
37. ### Write Array to Excel in R

How do I write an array to .xlsx file. I want to do it in a loop and would like to write it in same sheet.

• Replies: 3
• Views: 1,913
07-13-2011, 10:40 AM
38. ### Selecting correct statistical test help

Hi everyone, I hope you can help me out. I am struggling to determine which is the correct test for the data I have and any help would be greatly...

• Replies: 0
• Views: 379
LDO
07-13-2011, 08:58 AM
39. ### Ancova regression or correlation

Hi Everyone, I tried thison the psychology stats forum but never had any takers so thought I'd see if I get an opinion here. I'm postgrad student...

• Replies: 0
• Views: 396
07-13-2011, 07:45 AM
40. ### Repeated measures with very many (40) measurements per subject

Hey there! I need some ideas about how to analyse data with repeated measurements when there are very many measurements. I have a situation where...

• Replies: 3
• Views: 679
07-13-2011, 05:38 AM
41. ### Computing how abnormal a data point is in a non-normal distribution

Hi, folks. This is my first foray into posting on this forum, so apologies if there is a protocol I am unaware of. Let's say I have a binomial...

• Replies: 4
• Views: 840
07-12-2011, 04:14 PM
42. ### Stats help

Im currently writing a bachelors thesis where i have to find the import of a certain tree species such as mahogany. However there are only more...

• Replies: 0
• Views: 286
07-12-2011, 08:58 AM
43. ### Urgent question on ANOVA and t-test of mean and proportion

Hi, I'm writing on my thesis and would really appreciate some help. Mostly just telling me if I'm correct or not. So I have a couple of...

• Replies: 3
• Views: 1,714
07-12-2011, 08:23 AM
44. ### variance for absolute paired differences?

Hello, i’m new here and i hope you people can help me with the following. I want to test the validity of a method for estimating the year of...

• Replies: 3
• Views: 1,438
07-12-2011, 04:04 AM
45. ### testing for change in proportional preference, two dependent samples

Dear all, The stats problem I'm having: I want to see whether preferences for certain methods (M) stay the same over time or significantly...

• Replies: 0
• Views: 424
07-12-2011, 04:03 AM
46. ### Tukey table/chart

Can anyone help me with this? I'd like to carry out a Tukey test for comparing the mean of 27 samples (and the degree of freedom is 26)....

• Replies: 9
• Views: 9,167
07-11-2011, 06:00 PM
47. ### One-Way ANOVA: The Appropriate Test?

Social scientist here who is trying to expand into quantitative analysis to complement the qualitative work I do. I've been reading of statistics...

• Replies: 2
• Views: 607
07-11-2011, 05:59 PM
48. ### Margin of error meaning?

what does the margin of error mean? can it only be used in polls? if not in polls, what does it mean? so i got a margin of error of around 600,...

• Replies: 1
• Views: 1,536
07-11-2011, 04:55 PM
49. ### Probability distribution of item ratings

I have a set of N ratings of an item, where each rating is an integer between 1 and 7 (inclusive). You can imagine a rating of 1 as being a "strong...

• Replies: 2
• Views: 543
07-11-2011, 01:39 PM
50. ### R-square vs. Correlation

I have two arrays X and Y. I get correlation of about 25% but when I regress Y on X I get R-squared of about 8%. What does it mean intuitively...

• Replies: 2
• Views: 1,489
07-11-2011, 01:04 PM

Hi there all, Need some help with deciding on an appropriate test for my dissertation, which features a rather complex design. A little background:...

• Replies: 0
• Views: 368
07-11-2011, 02:42 AM

My committee advisor is on vacay & didn't leave me with much help. Anyway, first a little background on the thesis. My classmate was instructed to do...

• Replies: 5
• Views: 943
07-10-2011, 11:44 PM
53. ### Airline Statistics

I am trying to determine if there is a statistically significance (p=.05) in passenger enplanements between 2 different airlines at the same airport...

• Replies: 0
• Views: 468
07-09-2011, 06:37 PM
54. ### exponential distribution help

People arrive at a post office an average rate of 50 per hour. What is the probability that the next customer will arrive within 3 minutes? The...

• Replies: 3
• Views: 1,077
07-09-2011, 03:53 PM
55. ### A single value that summarises trust in sample mean

Suppose I have a number N of independent ratings of a given item, where each rating is an integer between 1 and 7 (inclusive). For simplicity sake,...

• Replies: 4
• Views: 663
07-09-2011, 11:14 AM
56. ### Monte Carlo significance test

Hi everyone, Could you please explain to me what the Monte Carlo significance test is? And, is this type useful to and robust to depend on it when...

• Replies: 0
• Views: 599
07-09-2011, 05:49 AM
57. ### Asymptotically unbiased & consistent estimators

Theorem: If "θ hat" is an unbiased estimator for θ AND Var(θ hat)->0 as n->∞, then it is a consistent estimator of θ. The textbook proved this...

• Replies: 3
• Views: 1,657
07-08-2011, 04:21 PM
58. ### Correlation

Hello, My name is Fernando, I'm a biologist and I also have many statistics questions. Hope you can help me. First of all: I'm working with...

• Replies: 1
• Views: 407
07-08-2011, 10:55 AM

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