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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: 197,080
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: 66,915
09-30-2005, 09:44 AM
1. ### Help with which test to use? Basic question

I have a big data set containing students, and each student has a grade for 3 different subjects (writing, reading, and mathematics), and I need to...

• Replies: 2
• Views: 1,947
04-03-2015, 05:46 PM
2. ### Inference, estimator of moments

If X_1,..,X_n is a random sample with density f(x;\theta)=e^{-(x-\theta)}e^{-e^{(x-\theta)}} x \in\mathbb{R} and -\infty<\theta<\infty i) Find the...

• Replies: 1
• Views: 1,224
04-03-2015, 03:54 PM
3. ### Customer Segmentation

Hi all, Just wondering what approaches you can take when analysing customer data where you cannot determine whether a customer is active or...

• Replies: 1
• Views: 983
04-03-2015, 03:54 PM
4. ### Bayes estimator 2

If X ~ Poisson(\theta) and \pi(\theta)~exp(1)(prior). Find the Bayes estimator for P_\theta(X=0) with respect to quadratic loss I calculated the...

• Replies: 9
• Views: 1,852
04-03-2015, 09:42 AM
5. ### Choosing the right level of measurement

Hi, I have kind of a specific question relating to levels of measurement. First of all, my task is to choose the right measure of association for...

• Replies: 1
• Views: 1,245
04-03-2015, 09:25 AM
6. ### Projecting Future Values using historical

Hi all. I'm sure this has come up before - but, I was looking for a little help. I'm trying to put together a financial model that uses...

• Replies: 1
• Views: 3,060
04-02-2015, 08:53 PM
7. ### Removing Seasonality from data

Hi, How can I remove seasonality from data, e.g. weekly sales data? I've used proc expand but is there a better way to do it? Thanks!

• Replies: 1
• Views: 1,372
04-02-2015, 05:02 PM
8. ### Bayes estimator 3

If X_1,..,X_n is a random sample of distribution f(x|\theta)=(\frac{\theta}{2})^{|x|} (1-\theta)^{1-|x|} I_{(-1,0,1)}(x) and the prior is Beta(1,1)...

• Replies: 0
• Views: 925
04-02-2015, 12:41 PM
9. ### Ordinal dependent variable - regression help!

First of all, I am a complete newbie to stats from a non mathematical background, but I need to analyse survey data for my dissertation! So I have...

• Replies: 0
• Views: 939
04-02-2015, 12:25 PM
10. ### SPSS help

Hi, I just have a few quick questions. Statistics is not my best subject...at all, and I could REALLY use the help. I am currently in Research...

• Replies: 3
• Views: 1,144
04-01-2015, 09:16 PM
11. ### which statistical test?

hi everyone. I'm trying to find the test to see if there is a significant relationship between one group of students' language proficiency and four...

• Replies: 2
• Views: 1,176
04-01-2015, 04:44 PM
12. ### Which test would be appropriate to test multiple variables?

I have a data on users with 5 personality variables. The users had to pick a logo for three different projects (most likely, may be, least likely)....

• Replies: 0
• Views: 1,093
04-01-2015, 09:51 AM
13. ### Need help chosing the right statisic test?

Hi, I'm new here, I posted on another forum but no one answered so I thought I would try here... There is depression scores from drug A, drug B...

• Replies: 2
• Views: 1,044
04-01-2015, 08:11 AM
14. ### Bayesian inference, Bayes estimator

Let X a single observation of distribution U~, where \theta is a random variable with density \pi(\theta)=\theta e^{-\theta},\theta >0 a)find a...

• Replies: 12
• Views: 3,240
03-31-2015, 05:02 PM
15. ### Research Help

Hi I am working on a study and I need help in deciding what test to use. I am comparing two groups. Domestic violence (DV) being present versus No...

• Replies: 1
• Views: 1,407
03-31-2015, 03:03 AM
16. ### Best online resources for learning statistical analyses for biology/ecology?

So, I'm currently in a master's program for ecology. I've taken the basic "Biostatistical Analysis" course which is offered here but I would like to...

• Replies: 0
• Views: 1,243
03-30-2015, 05:39 PM
17. ### Range from standard deviation?

Hi all, I'm a Clinical assistant Ophthalmologist doing an MMED with very rudimentary statistics knowledge. :confused: Is it possible to...

• Replies: 3
• Views: 1,224
03-30-2015, 03:43 PM
18. ### Panel data correlation

In a panel dataset of multiple years and multiple countries, what is best practice for running correlations among variables? I know that pooling by...

• Replies: 0
• Views: 1,009
03-30-2015, 09:26 AM
19. ### SigmaPlot

Dear Sir and Madam, I am from Germany and I am using SigmaPlot. I would like to draw a graph and I am facing problems doing this. I would...

• Replies: 0
• Views: 955
03-29-2015, 01:00 PM
20. ### Best Statistical Test for Dichotomous Variables?

Hi, I'm hoping someone can tell me what the best statistical test for this situation is: I'm trying to determine when individuals are exposed...

• Replies: 2
• Views: 1,407
03-29-2015, 10:45 AM
21. ### Approximation of the variance of the standardized mean difference

Hi, I'm trying to understand how the approximation of the variance of the standardized mean difference is derived: V_d = (n_c + n_t) / (n_c * n_t)...

• Replies: 0
• Views: 1,100
03-29-2015, 09:50 AM
22. ### Assumptions of ANOVA

I would like to better understand why the same variance is for each group is an assumption in the ANOVA. Can anyone explain this? Further it is...

• Replies: 4
• Views: 1,467
03-29-2015, 06:59 AM
23. ### A survey where participants circled at least one answer as the question asked

I have surveys I am working on. One of the questions asks the participants to circle religious themes that appeals to them and also that they should...

• Replies: 0
• Views: 1,394
03-29-2015, 01:00 AM

Dear all, I am having some conceptual difficulties in understanding and interpreting interaction terms (between a dummy and a continuous variable)...

• Replies: 2
• Views: 2,308
03-28-2015, 12:16 PM
25. ### Which statistical analysis to perform (Soil Science/Soil enzymology)

Hello everyone, I tried to find through the forum to get some help and it was helpful to get some information but still have some confusion so I...

• Replies: 2
• Views: 1,044
03-28-2015, 08:00 AM
26. ### Is this variable following a poisson distribution or a binomial distribution?

You're at a bus stop watching people go by, not buses. Let X = number of people wearing headphones

• Replies: 1
• Views: 988
03-28-2015, 05:35 AM
27. ### What does the ′ sign after a letter denote?

The ′ sign is often seen in especially econometrics combined with some coefficient like a′ or P′ or etc. It may also be a term used in matrix math....

• Replies: 5
• Views: 4,085
03-27-2015, 08:08 AM
28. ### An Income Statement deficit

If I don't charge for any purchases, but I pay for everything during the year, why do I get a negative number (deficit) when I run an Income...

• Replies: 1
• Views: 1,136
03-26-2015, 09:39 PM
29. ### Chi Sqaure and odds ratio help

Hi all, I was wondering - what's the relationship between chi square and odds ratio? To me it makes sense that these two values are fixed- i.e.,...

• Replies: 4
• Views: 1,479
03-26-2015, 04:58 PM
30. ### PhD Dissertation Help

I was hoping that someone could give me advice. I'm currently in my second year of the dissertation process of my PhD. My committee chair has not...

• Replies: 0
• Views: 969
03-26-2015, 04:43 PM
31. ### Just some homework help

Hey all. I'm a high school student taking a stats class and could use some help because i can't seem to understand how to do this question without...

• Replies: 1
• Views: 1,728
03-26-2015, 02:31 AM
32. ### Very basic question regarding multiplicity

Hi all, I'm hoping you can give me some homework help so I can better understand this question. I was asked, given a 0.05 significance level, how...

• Replies: 0
• Views: 982
03-25-2015, 06:28 PM
33. ### Using Pearson correlations and/or t-test to determine "importance" of variables.

Hi Internet, I'm a stats novice who is working on a data-heavy project at work (don't worry - my boss suggested I join a discussion forum so that...

• Replies: 0
• Views: 986
03-25-2015, 03:35 PM
34. ### Unusual Power and sample size problem with correlated data

Is there a way to estimate ‘effective sample size’ based upon data acquired where a correlation quirk of the original data set violated the...

• Replies: 0
• Views: 1,180
03-25-2015, 01:51 PM
35. ### standard deviation of A/B

Hello everyone, I'm trying to calculate a new variable C = A/B out of the variables A and B. I know mean and standard deviation from A and B and I...

• Replies: 1
• Views: 1,631
03-25-2015, 08:32 AM
36. ### Sample size during error propagation calculation

Hi, I have several questions regarding the calculation of error propagation. Assuming I have a group of 'A' data with mean =0.852361, sd=0.388232...

• Replies: 1
• Views: 1,745
03-24-2015, 06:47 PM
37. ### using odds ratio for correlation

Hi, we are working on a study using findings from 13 different countries on relation of substance use on suicide ideation and attempt. We...

• Replies: 1
• Views: 1,474
03-24-2015, 08:26 AM
38. ### Subtracting the slope from the intercept?

Hi all, I was wondering, in a standardised regression equation, what does it mean if the regression equation signifies a - b, instead of a+b? ...

• Replies: 4
• Views: 1,765
03-24-2015, 03:47 AM
39. ### help me solve these problems

I have two problem, please help, 1/ In a study of flight attendants, salaries paid by two different airlines were randomly selected. For 41...

• Replies: 1
• Views: 2,662
03-24-2015, 03:41 AM
40. ### hypothesis

Hi all, I have homework like this, it hard to me, please help 1/ Random samples of 1600 workers in Region 1 and 1400 workers in Region 2 have been...

• Replies: 2
• Views: 2,350
03-24-2015, 12:56 AM
41. ### p value relationship to standard error as samples increase?

Hi all, I would appreciate some help regarding the relationship between the p value and some other elements in my question below. Any help would...

• Replies: 2
• Views: 964
03-23-2015, 10:02 PM
42. ### Determining asset value using historical stats

Hey guys, nice to meet you all! My name is Jonathan and I'm from Queensland Australia. I'm currently working on a project which is seeking to find...

• Replies: 0
• Views: 827
03-23-2015, 09:38 PM
43. ### Stats project - statistical tests

Good afternoon everybody! I was just wondering if someone could offer advice on a stats project I am working on. It is for a foundation math...

• Replies: 2
• Views: 1,123
03-23-2015, 12:43 PM
44. ### Pearson's correlation and change score

Hi, For my final year project I conducted a study measuring performance of emotion recognition at three points: before, mid and after. One of my...

• Replies: 1
• Views: 1,176
03-23-2015, 06:00 AM
45. ### outliers in calulation of central tedency

I am dealing with some sort of scientific data having two extreme values (outliers) total no of obs is 100,values are below 10 but two are 80 and...

• Replies: 2
• Views: 1,060
03-22-2015, 01:59 PM
46. ### How to calculate the minimum x for histogram bins values

Let say that I want to construct an histogram for 100 continuous values with 5 bins of equal interval How do I select the minimum value for the...

• Replies: 0
• Views: 931
03-22-2015, 11:08 AM
47. ### Probability and Combinations

• Replies: 2
• Views: 1,506
03-22-2015, 10:54 AM
48. ### Help desperately needed. Thank you.

hi all, I have been struggling to understand what statistical test to use. I have been approaching it by understanding what dependent and...

• Replies: 3
• Views: 1,496
03-21-2015, 11:08 AM
49. ### Groups in a variable are largely unequal in size

Hi, I want to run an analysis on a data set. However, the primary predictor variable (5 point scale) varies greatly in size of each group. I plan...

• Replies: 1
• Views: 1,441
03-21-2015, 04:08 AM
50. ### Comparing animal abundance to percent cover of substrate?

Hey guys, So I'm interested in looking at how animal abundance varies between two different types of substrate. The animal abundance is in density...

• Replies: 2
• Views: 1,406
03-20-2015, 08:09 PM
51. ### Estimator 2

If X_1,X_2,....,X_n is a random sample with density f(x;\theta)=\frac{1}{2\theta}I_{(-\theta,\theta)}(x),\theta>0 . Find the maximum likelihood...

• Replies: 3
• Views: 1,176
03-20-2015, 05:36 PM
52. ### Mixed ANOVA withinXbetween interaction not significant, interpret simple effects?

Hi Experts, I have conducted a 2 (time: before, after) x 3 (condition 1 2 3) mixed ANOVA. The within X between interaction is only marginally...

• Replies: 1
• Views: 1,028
03-20-2015, 01:01 PM
53. ### correct statistical significance approach

Hi All, Quick question. I want to determine if there is statistical significance to some variations i am seeing within a set of time durations...

• Replies: 3
• Views: 1,061
03-20-2015, 09:19 AM

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