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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: 197,257
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: 67,020
09-30-2005, 09:44 AM
1. ### Age distribution between groups???

I am hoping to test whether there is a statistical difference between two groups of participants between the ages of 2-7. I know by looking at...

• Replies: 1
• Views: 2,512
11-01-2006, 07:50 PM
2. ### Age groups

How can I make age as an ordinal (categorical) variable? I work on the sample composed of Youth. 17-23, 24-30, More than 30 years old. What can I...

• Replies: 5
• Views: 1,837
06-01-2014, 12:22 PM
3. ### age is scale data in spss BUT what if the ages are grouped??? is it then ordinal?

Hi, I know that age is a scale measurement in spss but if i have ages that are groupef for example; 1= <20 2=21-30 3=31-40 4= > 40 is...

• Replies: 1
• Views: 29,079
03-27-2011, 08:34 AM
4. ### Age Matching

Hi i have a question about "age matching". So I am doing a study that evaluates a control's and diabetic's retinal function (measured in micro...

• Replies: 0
• Views: 1,153
10-30-2013, 02:57 PM
5. ### Age-Period-Cohort Model

I am looking for feedback on the feasability of a model I am specifying. I have four cohorts of longitudinal data. Each cohort contains ten years...

• Replies: 0
• Views: 1,111
05-07-2015, 09:59 PM
6. ### Aggregate Proxies in Micro Level Research

Can anyone point me to a straightforward discussion of the potential drawbacks of using aggregate proxies (say census tract median income instead of...

• Replies: 0
• Views: 2,234
03-05-2008, 01:21 PM
7. ### Aggregated data analysis

Hi, I would like to know how it would be possible to make a t-test with aggregated data on SPSS or R. My dataset looks like this: ...

• Replies: 0
• Views: 1,183
12-17-2015, 12:23 PM
8. ### Aggregating across data sets

First, I just want to say that I am as green is it gets regarding statistics, but am hoping someone here can help me do a sanity check. Right now,...

• Replies: 0
• Views: 1,003
03-08-2013, 02:53 PM
9. ### Aggregating standard deviations - I'm stuck!

Can anyone help with this stats problem? I'm working on a problem where I'm aggregating centers of gravity and the inertia tensor for multiple...

• Replies: 2
• Views: 7,976
06-03-2008, 08:14 PM
10. ### aggregation over groups vs. rounds

I have an experimental design where I have 10 groups and within each group there are 10 people. Each subject answers 12 questions five times. I...

• Replies: 0
• Views: 1,522
eph
03-13-2012, 08:50 AM
11. ### Agnes

Hi, I'm just starting with clustering. I am trying Agnes for now. I have a table of N observations (individuals?) and M variables for each...

• Replies: 0
• Views: 1,872
11-23-2010, 07:46 AM
12. ### AIC GLM and GLMM

I'm running a GLMM with a number of fixed and random effects with a binary dependent. However, I want to look at the main effect of one of the fixed...

• Replies: 4
• Views: 1,598
08-06-2015, 02:24 PM
13. ### 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: 1,987
07-09-2011, 06:37 PM
14. ### Algorithm for Ranking in Game

Disregard///

• Replies: 0
• Views: 2,430
11-07-2010, 08:44 AM
15. ### algorithm for solving a double integral with monte carlo method

Hi, everyone Is been a while since I finished school and my nephew needs me. He has to calculate an double integral ∫0∞∫0∞e(-x-y-xy)dxdy ...

• Replies: 0
• Views: 1,655
05-02-2012, 02:41 AM
16. ### algorithms for generating books

Hello to all! There are sites that have software that can write entire books by extracting information from the internet. entering the keywords for...

• Replies: 2
• Views: 1,421
10-21-2013, 09:57 AM
17. ### All assumptions violated?

Hi everyone, I'm working with a student on her Masters and we have come across an interesting problem that is beyond me. We're looking at the...

• Replies: 1
• Views: 1,667
10-23-2013, 02:33 AM
18. ### All you need is mu

Last time this forum gave me some good help, spotting a mistake that i hadn't noticed. Hopefully this time you can have a look at this and see if...

• Replies: 1
• Views: 1,117
02-04-2013, 09:17 AM
19. ### Allocating Items to a Limited Number of Slots

Hi, Let's say that I have a small retail shop that has slots available for only 5 types of products. However, I also have a warehouse located...

• Replies: 0
• Views: 3,023
01-06-2007, 08:43 AM
20. ### Almost done with assignment but . . .

Need some help on the final steps. Multipart assignment and I am down to last three steps but am on last two. Parts are 7. Calculate...

• Replies: 1
• Views: 2,640
04-23-2007, 01:17 PM
21. ### almost sure convergence vs. convergence in probability, practical difference?

Hello I know the theoretical difference between these two types of convergence. Are the difference important in practice? If you are going to...

• Replies: 2
• Views: 1,620
07-13-2014, 04:43 PM
22. ### Alpha & Beta errors!

A machine produces 50 lb bags of chips. In this particular process, it is important that the chip content does not go below 49.9 lbs. In fact, when...

• Replies: 3
• Views: 4,520
11-06-2009, 10:20 AM
23. ### alpha and p-value hypothesis testing?

What does it mean when alpha > p-value? I know that when alpha> p-value, you reject the null, and that when alpha < p-value you do not reject the...

• Replies: 1
• Views: 4,294
05-30-2010, 09:16 PM
24. ### Alpha error and Bonferroni correction?

Hi! I'm writing my masterthesis and I would be happy to get an advise about bonferroni correction. I'm analysing if adverse childhood experiences...

• Replies: 1
• Views: 3,392
03-14-2011, 09:54 AM
25. ### alpha level

Here is a question i am working on and the answer seems to be a little too simple: If (regardless of the data) I wanted to reject Ho always, what...

• Replies: 2
• Views: 3,103
03-22-2009, 02:18 AM
26. ### alpha level question

Hi, could someone please help with the below question? Why does setting the alpha at a different level change the probability of a type 1 and type...

• Replies: 1
• Views: 1,661
04-14-2012, 01:21 AM
27. ### Alpha size and power?

In statistical hypothesis testing, does a bigger size alpha mean a more powerful test? Is an alpha level of .05 more powerful than an alpha level...

• Replies: 1
• Views: 6,349
Boa
05-27-2010, 11:16 AM
28. ### alpha? p-value?

Hi everyone, I am very confused with p-value and alpha. I do appreciate your help. Please take a look at the following questions and answers: ...

• Replies: 7
• Views: 77,998
BGM
01-03-2012, 09:09 AM
29. ### Alphabets

So I just took an exam with the following question: Using all 26 letters in the English alphabet, you completely random combinations of 7 letters....

• Replies: 5
• Views: 1,284
10-06-2012, 11:23 AM
30. ### Alter sample size during experiment based on results, influence on P(Type I error).

I hope anyone can help me to understand why you cannot simply increase the sample size during an experiment based on intermediate results, because...

• Replies: 1
• Views: 896
BGM
05-14-2014, 07:23 AM
31. ### Alternate route problem

Hi all, I am having difficulty in a question which says a man can choose two routes since on Xmas his preferred route is busy and he wants to get...

• Replies: 6
• Views: 2,810
01-29-2011, 05:23 PM
32. ### alternate t-test

Hello Folks! I'm working on a problem where I test whether the difference between 2 means is zero using this statistic: tobs = (¯x − ¯y)/q(sx^2...

• Replies: 4
• Views: 2,708
10-01-2010, 12:22 AM
33. ### Alternative Durbin-Watson Test

Hey, For some reason, I just cannot get my head around the concept of the alternative Durbin-Watson tests that I am trying to calculate. I'm...

• Replies: 0
• Views: 3,910
05-08-2008, 10:29 PM
34. ### alternative for chi square

what is the alternative for (2x2 table) chi square if more than one cell has an expected value of less than 5, given that the sample size is more...

• Replies: 4
• Views: 7,766
09-15-2010, 08:30 PM
35. ### Alternative hypotheses, sample size

Ichose to study this problem, how would I incooperate the rest with this? Heights measured for a random sample of 17 plants grown while being...

• Replies: 1
• Views: 3,997
04-27-2008, 12:36 PM
36. ### Alternative Hypothesis Help

6) A mirror maker claims his best product has an average lifespan of exactly 20 years. A skeptical quality control specialist asks for evidence...

• Replies: 2
• Views: 2,774
04-03-2009, 01:22 PM
37. ### Alternative hypothesis.

Find the Alternative Hypothesis the formula for each test statistic, if one exists : H0:μ=μ0 n=20 and s =45 pop normal distribution H0:μ≤μ0 n...

• Replies: 0
• Views: 2,014
05-15-2011, 04:46 PM
38. ### Alternative nonparametric test for chi-square test for independence

Hello, suppose we have a table like this: and we want to know if wining or loosing depends on sex (male or female) apart from chi-square test...

• Replies: 0
• Views: 1,258
03-21-2013, 02:40 PM
39. ### Alternative theory?

Can you kindly take a look at this problem and check my answers for a, b, and c? Any insight/suggestions are appreciated. Thanks PROBLEM: 133...

• Replies: 0
• Views: 2,113
03-23-2009, 04:10 PM
40. ### alternative to ANOVA for count data? (old post re-worded/simplified)

On the advice of a couple of members, I am re-posting my question more concisely so hopefully it is easier to follow.. I have categorical count...

• Replies: 2
• Views: 2,030
11-16-2011, 06:08 PM
41. ### Alternative to Chi2

Hello, I am comparing proportions but the 2 samples have very different sizes with one of them being really big. Example: 1/92 vs 16/58232 which...

• Replies: 0
• Views: 2,771
12-06-2011, 04:31 AM
42. ### Alternative to factor analysis when there are less than 100 participants?

Hi all It's been quite some time since I've posted on this site, but have come up against a new problem in my analysis that is baffling me...

• Replies: 1
• Views: 6,356
06-15-2009, 06:59 AM
43. ### Alternative to matrix algebra?

I have a table of data that has 11 rows and 33 columns. The independent variables of each case contribute to determining a single dependent variable...

• Replies: 0
• Views: 2,189
03-28-2009, 04:24 PM
44. ### Alternative to t-test in very large dataset

I am having a big problem with a very large dataset (10000+) of dispositional and behavioral measures in health professionals: every single t-test...

• Replies: 6
• Views: 3,058
09-15-2011, 08:19 AM
45. ### alternative to univariate

Hi! I'm doing an empirical research on metacognition and false memories. I am not certain which test to use to find out a possible interaction. I...

• Replies: 1
• Views: 2,782
02-19-2009, 04:32 PM
46. ### Alternatives to two-way tables

Are there any alternatives to two-way tables that show a higher level of understanding? If you know some, could you please detail and explain how...

• Replies: 1
• Views: 1,048
01-22-2013, 03:21 PM
47. ### Always able to assume normality if sample size >= 31

I know at a sample size of 31 or larger, and from a random sample selection, you are able to assume normality. Is this in general always true? If...

• Replies: 6
• Views: 19,739
09-28-2009, 03:21 PM
48. ### Am I choosing the right test?

My daughter is doing a science fair project testing the efficacy of insect repellants. She has 3 trials each for 3 repellants and 1 control. In...

• Replies: 1
• Views: 1,558
11-11-2016, 11:03 PM

Hi all, great site and a valuable resource. i am wondering if you guys could please help me out in my thinking out my research question. Ive made...

• Replies: 0
• Views: 2,104
10-19-2010, 11:35 AM
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. ### Am I correctly generating my p-values?

Hi, I am a doctor in the UK, and did a (very) little bit of undergraduate statistics >10 years ago. I am preparing an abstract for submission for...

• Replies: 4
• Views: 1,588
04-16-2014, 01:31 AM
52. ### Am I doing this ANOVA right?

Hi, although I am doing graduate work I am totally new to stats and its doing my head in! Please try to answer in plain english! I am planning...

• Replies: 1
• Views: 1,723
06-29-2006, 05:23 PM
53. ### Am I heading in the right direction?

Hi all, first post here, but I'm not trying to sponge off your vast knowledge! Just wanted to ask if I'm going about my analysis in the right...

• Replies: 0
• Views: 1,857
04-09-2008, 05:52 AM
54. ### Am I interpreting this correctly?

I have a continuous DV and 2 categorical + 1 continuous IVs. In spss I did a univariate analysis and found a main effect of one of the categorical...

• Replies: 0
• Views: 1,102
09-30-2016, 07:21 PM

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