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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: 197,273
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: 67,035
09-30-2005, 09:44 AM
1. ### Standard deviation

Q1)How: Standard deviation usually measuring the spread of the observations? Q2)Why:If we set for the mean =0 and standard deviation=1 and if I...

• Replies: 5
• Views: 1,827
01-08-2013, 05:11 PM
2. ### Weights in equation

Hey guys. I've been working on some data and I've come up with an idea that I don't know how to calculate (since I'm not really a mathematician)....

• Replies: 0
• Views: 1,380
01-08-2013, 12:14 PM
3. ### Check moderation using ANCOVA

I have searched online and still couldnt find an exact way to check whether there is moderation by a continuous covariant between the DV and a...

• Replies: 0
• Views: 3,319
01-07-2013, 11:42 PM
4. ### simple way to calculate error mean square

I have data from many experiments, I want to calculate the coefficient of variation for each experiment i.e. error mean square/grand mean, is there a...

• Replies: 0
• Views: 1,245
01-07-2013, 07:14 PM
5. ### Meta-analysis using unpublished randomised trials

Meta-analysis using unpublished randomised trials Hi, I am intersted to do a meta-analysis, have data set from about 50 experiments, mostly...

• Replies: 1
• Views: 1,524
01-07-2013, 04:40 PM
6. ### Simple effects- multiple comparisons adjustments necessary?

Hi guys, I cannot seem to figure out what the correct procedure is for simple effects analysis when decomposing interactions. So I have a...

• Replies: 8
• Views: 2,491
01-07-2013, 06:02 AM
7. ### Help with Defining the null hypotheses for Manova

Hi all, I'm trying to test the combination of 4 different treatments therefore I have 16 different groups with different combinations of the...

• Replies: 0
• Views: 1,843
01-07-2013, 01:55 AM
8. ### Mixed MANOVA ... or something else?

Hello Ladies & Gents, I'm working on my dissertation and *thought* I had my stats all figured out until a recent change in my methodology, which...

• Replies: 0
• Views: 1,141
01-07-2013, 01:22 AM
9. ### Whether / how to combine 2 linear equations for different variables, and weighting

I'm analysing results from measurements of 2 variables (a, b). The goal is to use them singly or together to determine a 3rd variable, c. All 3...

• Replies: 0
• Views: 2,632
01-06-2013, 11:55 PM
10. ### Stats question help

I have been trying to work out a college question, that brought me to your forum :) :tup: I know my answer is wrong, but I cant work out why, any...

• Replies: 1
• Views: 1,275
01-06-2013, 10:05 AM
11. ### Parameter estimates for main effect conflict with graphical representation: Why?

Background I am looking at the abundance (counts) of predators in wheat fields. One key factor I want to know is whether wheat fields neighbouring a...

• Replies: 0
• Views: 1,075
01-06-2013, 07:40 AM
12. ### covariance is same as expected value in this case?

Hi all, I was watching a lecture on techtalks.tv (http://techtalks.tv/talks/spectral-approaches-to-learning-latent-variable-models-part-1/57663/) and...

• Replies: 0
• Views: 1,776
01-04-2013, 06:51 PM
13. ### Effect size for Wilcoxon Signed Rank

1) i want to calculate the effect size for wilcoxon signed rank (paired sample). I have one group of 10 participants. I know the formula for the...

• Replies: 10
• Views: 16,130
01-04-2013, 04:02 PM
14. ### Two way ANOVA

Hi, I have 2 groups ('keypad' and 'touch screen'), and each group has teh number of participants who are 'right ahnded and left handed. For...

• Replies: 5
• Views: 1,980
01-04-2013, 04:01 PM
15. ### What test to use?

Let's say you are testing the affect of two things, A and B, on study subjects. One group of subjects is assigned to A, and the other is assigned to...

• Replies: 12
• Views: 2,405
01-04-2013, 04:00 PM
16. ### unbalanced two-way ANOVA : How to compute the interaction power ?

Hi all :) I finished running a two-way anova test : the result for interaction between the two variables is insignificant. To know if no type II...

• Replies: 0
• Views: 1,585
01-04-2013, 03:10 PM
17. ### Mediation help needed please

What am i supposed to be reporting and which significance should i be looking at?

• Replies: 2
• Views: 2,751
01-03-2013, 04:54 PM
18. ### Kurtosis - Example to calculate, Help Please!

Ok, hope people have PATIENCE with me here...I am doing some stat calculations, but I am NOT a statistician, so please bear with me. Please don't...

• Replies: 5
• Views: 30,332
01-03-2013, 01:25 PM
19. ### Help with null/alternative hypothesis in Z-test of proportions

I have a clinical trail where all the patients sufferd from a stroke. I need to assess the efficacy of the drug treatment (drug/placebo) for the...

• Replies: 1
• Views: 3,099
01-03-2013, 12:03 PM
20. ### Standard Error - interpretation and relative standard error

Hi, I am unclear about how to interpret the Standard Error of the Mean (SEM) directly. For example, when a mean is reported as 5.00 + 0.50SEM,...

• Replies: 5
• Views: 3,847
01-03-2013, 11:16 AM
21. ### Online Calculator for Kruskall-Wallis

:tup:Hello there, I've looked at a few online calculators for the Kruskall-Wallis method, but am unsure which one is easiest/most reliable to use?...

• Replies: 2
• Views: 2,236
01-02-2013, 02:59 PM
22. ### Compare three groups

Hi all- I have a very basic question. I measured forces generated with three pairs of tools (2 similar type A tools, 2 similar type B tools, and 2...

• Replies: 3
• Views: 1,879
01-02-2013, 02:41 PM
23. ### What is the difference between a white noise process and a random process?

Hi, What is the difference between a white noise process and a random process? Thank you

• Replies: 1
• Views: 3,016
01-02-2013, 02:23 PM
24. ### running a meta-analysis with stata

For my masters I am running a meta-analysis on the effects of protein supplementation on muscle function (walking speed in m/s). For multiple studies...

• Replies: 3
• Views: 4,446
01-02-2013, 01:21 PM
25. ### Compare 2 lists for statistical significance , which test to select ?

I have 2 lists, a list that bought books and a list of readers that read those books. The lists are not coming from the same population . So the...

• Replies: 9
• Views: 3,989
01-02-2013, 09:16 AM
26. ### Compare 2 tests and choose the one that provide more results

Hi , I have 2 tests, one will give me results for more cases (80%-90%) and another test will give me some results (60%-70%). How can I say or prove...

• Replies: 7
• Views: 2,454
01-01-2013, 06:06 PM
27. ### The other formula for SD

We all know the formula for SD But I recall a pal of mine long long ago showing me another formula for working out SD that - he argued - was far...

• Replies: 7
• Views: 9,787
01-01-2013, 03:36 PM
28. ### Correlation

Hi, I've two monthly datasets: The first , the Percentage of people who intend to buy a house within the next 6 months (for example in December it...

• Replies: 7
• Views: 2,095
GIS
01-01-2013, 03:34 AM
29. ### markov inequality property question

Dear All, As you know that markov inequality property is: My question is that valid that to use invariant of this property in the reverse way,...

• Replies: 2
• Views: 1,641
01-01-2013, 03:10 AM
30. ### confidence of measurement when only 2 values are available

Hi there, This isn't a homework question. I'm a PhD student, and I'm currently working on an area that would be a little lengthy and unnecessary...

• Replies: 0
• Views: 1,281
12-31-2012, 05:28 PM
31. ### Any suggestions?

I am using Systat 13.1 to predict the influence of tobacco use on blood flow. Tobacco use is an independent binary variable (1,0, yes/no) and blood...

• Replies: 9
• Views: 1,126
12-31-2012, 03:23 PM
32. ### Interpreting beta coefficient with log-transformed DV (back-transforming)

My (continuous) dependent variable, drug dose, was right-skewed so I log-transformed (lognormal). The co-efficient for gender (female) is -0.4...

• Replies: 1
• Views: 1,288
12-30-2012, 09:09 PM
33. ### Help with CHI-SQUARE TEST!

Hello, I have done in Excel Chi-Square test with the help of the function "CHITEST()" and the result that i got is: 2.45978E-08. I have no idea...

• Replies: 2
• Views: 1,288
12-30-2012, 07:31 PM
34. ### calculating probability for a t-distribution

Hello, I have a set of n real numbers (x1, x2,..., xn). I've calculated the mean and sample standard deviation using Excel and I'm making the...

• Replies: 0
• Views: 1,642
12-30-2012, 07:17 PM
35. ### degrees of freedom for two-way repeated-measures ANOVA

I had a related topic over on the R forum involving my lmer model, but now I'm more concerned with the degrees of freedom, which I thought was a more...

• Replies: 0
• Views: 3,391
12-30-2012, 04:55 AM
36. ### Chi-Square and Uniform distributions: Where are they prevalent?

Hey all. I'm in a pinch on a study and am needing to track down a source which will help me to identify in what areas of research data are organized...

• Replies: 9
• Views: 3,388
12-28-2012, 01:34 PM
37. ### half data is normal - transform for a t-test?

I have rainwater runoff retention data for a green roof and a concrete roof for 70 separate rain events. I want to compare them using a paired...

• Replies: 2
• Views: 1,464
12-28-2012, 09:47 AM
38. ### How to performance of a model

Hello, I was hoping that somebody could advise me how to do determine the error or variation in a model. The model simulates the power demand...

• Replies: 1
• Views: 1,728
12-27-2012, 11:38 PM
39. ### Which test to use?

I was wondering if anyone could help? I am researching attitudes to domestic violence. I am researching attitudes of males and females to male and...

• Replies: 4
• Views: 1,841
12-27-2012, 07:14 PM
40. ### Research design strategy according to the statement

I have thought for a long time, and really tried hard to figure out the answer. So I want to see if you guys agree my answer for these 2 questions. ...

• Replies: 0
• Views: 1,288
12-27-2012, 04:52 PM
41. ### Help with homework - Which statistical significance test to use?

Hi guys, I have an assignement to do and I need some help with the questions. The data was extracted from 62 patients involved in a study which...

• Replies: 4
• Views: 1,242
12-27-2012, 01:06 PM
42. ### I need to know more statistics, without going to school

hello I got my bs in statistics 3 years ago. I feel like i dont know enough stats. I know basic things that anyone who took a couple of...

• Replies: 3
• Views: 1,570
12-27-2012, 11:38 AM
43. ### Question on sample var/se and DoF

When you are calculating a sample's variance or standard error, you use (Sum(X - Xbar)^2)/(n-1), and the square root for SE. n-1 is the degree of...

• Replies: 4
• Views: 2,071
agp
12-27-2012, 09:23 AM
44. ### Unable to find the correct combination / permutation rule for my statistics project

First and foremost, THANK YOU in advance for helping me with my statistics project that I have been unable to solve on my own or through the help of...

• Replies: 0
• Views: 1,260
12-26-2012, 07:32 PM
45. ### Statistical test to use

Hi guys, I have two categorical binary variables. The independent variable is "on campus accommodation" (Yes/no question) and the dependent...

• Replies: 0
• Views: 1,027
12-26-2012, 03:05 PM
46. ### how to determine if a "1" tends to occur at the same position in several bit streams?

I have six data sets of equal length; each data set consists of bits obtained from a device run over the same 12 hour period (the six experiments...

• Replies: 4
• Views: 1,330
12-25-2012, 10:33 AM
47. ### parametric or non-parametric statistics

I have two groups (Group I=exercise, group II=control). Each of them has 12 healthy subjects. Exercise group performs 8 weeks of an exercise...

• Replies: 0
• Views: 784
12-25-2012, 07:31 AM
48. ### Hard questions related to the hypothesis testing and results

Here are the questions: 1.) the idea that your results happened by random chance or error, not due to any real differences 2.)To determine...

• Replies: 0
• Views: 1,647
12-25-2012, 02:34 AM
49. ### The number of people in the US measured by the Census

The number of people in the U.S. as measured by the U.S.Census is a ? There are a few choices: In my opinion, it is either (B)...

• Replies: 7
• Views: 1,958
12-25-2012, 01:52 AM
50. ### Hypothesis Testing

I was asked a valid question that I couldn't answer. Why perform Hypothesis Testing when I have the entire population data?

• Replies: 1
• Views: 1,109
12-24-2012, 07:52 PM
51. ### Help understanding log transformation and it's use in confidence intervals

I have raw data and have done a 90% confidence interval on it (I'm using R and am a beginner , but think I've done it right) I also transformed...

• Replies: 0
• Views: 2,294
12-24-2012, 07:32 PM
52. ### Independence?

Hi. I chose a group of criteria for assessing a study's success. I'm looking at a group of studies and testing whether their reported success...

• Replies: 1
• Views: 1,189
12-24-2012, 07:54 AM

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