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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. ### permutations and confidence intervals

Hello! I am in need of a little guidance on a stat problem... I've performed a permutation on two data sets, in R, regarding sunblock efficacy,...

• Replies: 0
• Views: 1,375
02-15-2013, 10:14 PM
2. ### Homework Help

The problem is: Consider the experiment of tossing two dice. Let Y denote the absolute difference of the upturned faces. A) Find the mean and...

• Replies: 3
• Views: 1,199
02-15-2013, 09:55 PM
3. ### Fixed and random effect model?

I've come across these model names in the literature and don't have that much background info on the topic. I was reading some definitions I found by...

• Replies: 0
• Views: 1,003
Jka
02-15-2013, 11:03 AM
4. ### Power analysis for correlation study

Hello, I am in the process of planning a clinical study looking for a correlation between two different behavioral measurements. In order to plan...

• Replies: 0
• Views: 2,333
02-14-2013, 04:31 PM
5. ### How to convert two particle bivariate distribution to a single variable distribution

Hello, In physics when studying identical particles bivariate probability density functions arise that describe the position of each particle....

• Replies: 2
• Views: 1,595
02-14-2013, 12:28 PM
6. ### repeated measures ANOVA - Design matrix

Hi, I am working on repeated measures ANOVA for the data I have gathered. I created my table and I understood how to apply the technique but I...

• Replies: 6
• Views: 3,232
02-14-2013, 09:52 AM
7. ### Question

Bare with me. 42 43 46 46 47 47 48

• Replies: 3
• Views: 1,210
PSG
02-13-2013, 10:36 PM
8. ### I am so lost

I am in the fourth week of 5 week course in Statistics and I do not understand t scores, ANOVA or f score Can anyone explain it to be in simple...

• Replies: 1
• Views: 1,531
02-13-2013, 06:26 PM
9. ### Hosmer and Lemeshow Test

How do you discussion the vaule for the Hosmer-Lemeshow goodness of fit in a logistic regression? Hosmer and Lemeshow Test Chi-square df Sig. 1)...

• Replies: 4
• Views: 6,001
02-13-2013, 03:02 PM
10. ### Reverse Coding

Hey guys, new to this site and could use some help. im using the IES (Impact of Events scale by Horowitz 1979) in a study and I cant find anywhere in...

• Replies: 2
• Views: 1,970
02-13-2013, 11:02 AM
11. ### Principle component analysis

Hi, Can we use Principle component analysis for non normal data? Or Is there sample size limitation for Principle component analysis? Thanks,...

• Replies: 0
• Views: 914
02-13-2013, 04:30 AM
12. ### can anyone explain this?

I am a new user to Systat 13 and I am becoming familiar with logistic regression. However I am unclear what "reference levels" are and how this...

• Replies: 0
• Views: 1,266
02-12-2013, 09:21 PM
13. ### Best way to determine if replication helped

I am trying to figure out a way to help show me that having two reps in an experiment is better than one rep. I remember doing a blocking efficiency...

• Replies: 11
• Views: 1,780
02-12-2013, 08:35 PM
14. ### Dental Grad Student needs help with statistics

Hi everyone, I'm a grad student in dental school. I am working on an experiment that might be a little difficult to explain, so let me give you...

• Replies: 1
• Views: 1,367
02-12-2013, 07:56 PM
15. ### Some Help on My Ti84

I am trying to do the Least-Square Regression(you know where that line goes through) but that line is not coming up. I was doing my problems fine...

• Replies: 1
• Views: 1,125
02-12-2013, 06:40 PM
16. ### Sufficient Statistic for θ

Hey guys, So Im looking for a sufficient statistic for θ for U(θ, θ+1) Here's what I was thinking. T(X^n)=(min X_{i},max X_{i}) since the pdf is...

• Replies: 11
• Views: 42,216
02-12-2013, 04:48 PM
17. ### Sample design problem

A healthcare provider has been paid on N claims for certain health services, some of which may have been unauthorized. I must draw a sample of n...

• Replies: 0
• Views: 1,335
02-12-2013, 02:59 PM
18. ### What to do when the predictors are not what I expected (when the model is fine)?

I would try to clarify the problem and then ask the questions. The problem (variable names are masked due to confidentiality): I ran a binary...

• Replies: 24
• Views: 4,731
02-12-2013, 11:16 AM
19. ### Added-Variable Plot for Panel Data

Dear all, in Frees (2004): "Longitudinal and Panel Data" there is a short description of a procedure for Added-Variable or partial regression...

• Replies: 0
• Views: 1,418
02-12-2013, 07:46 AM
20. ### Finding an appropriate sample size?

Hi, I'd really like some help on the following issue - I've been searching the internet for over two hours now, so I'm either completely oblivious to...

• Replies: 1
• Views: 1,743
02-11-2013, 10:09 PM
21. ### Marginal Gauss Distribution

Hello, I am a little confused with marginal gauss distribution. According to what i find through internet and teacher notes, the marginal...

• Replies: 1
• Views: 1,873
02-11-2013, 07:15 PM
22. ### help with lots of data and minitab 16

Hi, i need to do a number of analysis on a large amount of data, minitab 16 looks like the easiest to get to grips with from what i have seen so far...

• Replies: 0
• Views: 1,012
02-11-2013, 02:39 PM
23. ### A Question about Regression analysis

Hello! If only pretest scores are used as a covariate in a pre-posttest experimental study (& a number of other relevant independent variables can...

• Replies: 5
• Views: 1,768
02-11-2013, 10:08 AM
24. ### If interaction term is not significant???

If in a 2-way ANOVA, main effect of group is significant & main effect of gender & interaction effect (gender x group) are not, then can the...

• Replies: 1
• Views: 3,058
02-11-2013, 10:02 AM
25. ### General Question Regarding Construction of Confidence Interval

Hi! I have a very basic question regarding confidence intervals. Given I want to construct a confidence Interval for the expected value mu of...

• Replies: 0
• Views: 1,899
02-11-2013, 06:42 AM
26. ### Fixing a threshold to create contingency tables for Cochran–Mantel–Haenszel test

I have two continuous variables, X, and Y, and create their contingency table by using the median of each variable as a threshold. I repeat this...

• Replies: 0
• Views: 11,992
02-11-2013, 03:22 AM
27. ### Please help me with multiple comparisons

Hello, I just have a quick question understanding multiple comparisons and I'd appreciate any help because I'm on the verge of failing :( I'm...

• Replies: 0
• Views: 1,006
02-11-2013, 12:39 AM
28. ### Some help on Zscore

.97 2.47 3.94 4.11 5.79 1.14 2.78 3.97 4.77 6.14 1.85 3.41 4.00 5.22 6.28 2.34 3.48 4.02 5.50 7.69 Compute the z-score...

• Replies: 6
• Views: 1,801
02-11-2013, 12:02 AM
29. ### Percentage equivilant query - Actual commission at stake - Someone clever please help

Thank you in advance to anyone who can give me the answer. PLEASE CAN SOMEONE OUT THERE HELP ME, I HAVE HAD 57 VIEWS AND NO REPLIES? My sales...

• Replies: 0
• Views: 992
02-10-2013, 06:00 PM
30. ### Finding estimated standard error

Let X_{1},...,X_{n} ~ F and let \hat{F} be the empirical distribution function. Let a<b fixed numbers, define θ = T(F) = F(b) − F(a). Let θˆ =...

• Replies: 0
• Views: 803
02-10-2013, 10:45 AM
31. ### Confusion regarding sampling from a distribution and Variance

Hi all, I have a query regarding sampling from a hypothetical distribution, lets say the standard normal distribution. If I remove a single IID...

• Replies: 1
• Views: 1,333
02-10-2013, 09:45 AM
32. ### combine probability function and PDF

I have a function describing probability of an event happening as a function of value X (p=0 if x<d;p=x-d if d<x<2d; p=1 if x>2d), and lognormal...

• Replies: 0
• Views: 1,985
02-10-2013, 05:21 AM
33. ### Consistent MLE of a U(0, θ)

So the question is: Let X1,.., Xn ∼ U(0, θ). Show that the MLE is consistent. Hint: Let Y=max {X1,... ,Xn}, for any c, P(Y <c)=P(X1 <c,X2...

• Replies: 11
• Views: 58,460
02-09-2013, 09:14 PM
34. ### degrees of freedom

hi could someone please explain degrees on freedom and also if for example you have a high degree of freedom a total of 139 what does this mean?...

• Replies: 3
• Views: 2,251
02-09-2013, 08:22 PM
35. ### Assessing variability between non-normally distributed samples

I am trying to assess the difference in the dispersion or variance of 2 datasets taken from different sites. Because they are not normally...

• Replies: 0
• Views: 1,244
02-08-2013, 10:59 PM
36. ### Determining best ANOVA Interaction Term and Understanding in Model

Hi. I am testing an experiment of 400 Entries that have each been subjected to two inoculation methods (treatments). I know that my entries will...

• Replies: 0
• Views: 1,127
02-08-2013, 05:17 PM
37. ### Determining the differences in risk across firms

For my project, I need to create a regression model and evaluate the differences in risk across firms, where risk is measured as stdev of returns. ...

• Replies: 4
• Views: 1,852
02-08-2013, 02:42 PM
38. ### Calculating possible combinations

Hi, I have a question regarding calculations. This involves one question on a survey. The question is made up of 17 different subquestions. For...

• Replies: 1
• Views: 1,127
BGM
02-08-2013, 01:16 PM
39. ### Negative fold change on standardized data.Is "uncentering" data the right solution?

Hi all, Hope this finds you all well. I work with large biological data sets and I have bumped into a most likely trivial problem. I am not sure...

• Replies: 0
• Views: 1,600
JCA
02-08-2013, 12:04 PM
40. ### Confidence interval ratio/proportion?

Hi, I'm having a question concerning a confidence interval for a percentage share and I would appreciate if someone could help me. I have data...

• Replies: 15
• Views: 3,227
02-08-2013, 09:11 AM
41. ### Randomized Response Question Help

Hello! I'm experiencing difficulty with the following question and would appreciate help. It is a randomized response, which allows respondents...

• Replies: 0
• Views: 1,128
02-07-2013, 07:13 PM
42. ### Need some guidance

I have run an experiment and need to know how to analyze the data. The experiment had 14 treatments and was rated at 3 set dates after treatment....

• Replies: 0
• Views: 1,671
02-07-2013, 05:13 PM
43. ### SAS repeated measures ANOVA, comparison of within-time effects?

Hey guys, this is my first post, so thanks in advance for reading. I am using SAS, and comparing the effects of a drug on a biological measure,...

• Replies: 2
• Views: 2,319
02-07-2013, 03:06 PM
44. ### Is One-way ANOVA appropriate for my data?

I was given the following question: "A trial was conducted to compare a shampoo (treatment A) with a placebo shampoo (treatment B). The subjects...

• Replies: 3
• Views: 1,814
02-07-2013, 02:43 PM
45. ### Method of Moments: Can Variance be Included in Estimator?

The question is: Suppose that X_1,X_2,\cdots,X_n are i.i.d random variables on the interval with the density function ...

• Replies: 1
• Views: 1,442
BGM
02-07-2013, 04:49 AM
46. ### t-test on percentage

Hi all, Pretty simple question: I have two mean performance scores in percent, one is 70% +/- 3(SEM) and one is 95% +/- 1. Someone said I...

• Replies: 2
• Views: 3,195
02-07-2013, 12:32 AM
47. ### correlation of 3 variables

X is negative correlate with Y, and X is negative correlate with Z, the question is: is it possible that Y is negative correlate with Z? Give an...

• Replies: 11
• Views: 2,856
02-06-2013, 08:45 PM
48. ### Cross correlation or time lag in mixed models (SPSS)

Hi, Is it possible to implement a time lag for fixed or random effects (like a cross correlation) when performing a mixed model analysis in SPSS...

• Replies: 0
• Views: 4,504
02-06-2013, 05:54 PM
49. ### calculating confidence interval bands for a normal probability plot

Hi I am producing a normal distribution probability plot, and I have a few questions related to confidence interval. An example of the plot I...

• Replies: 0
• Views: 3,605
02-06-2013, 01:23 PM
50. ### Statistical tests for a usability survey with a likert scale?

Statistical newbie here. I am trying to understand what statistical tests can be/should be ran for survey information on the ease of use of a web...

• Replies: 2
• Views: 3,024
02-06-2013, 12:52 PM
51. ### on the use of SD , SE or confidence interval.

Dear All I have a difficult data set from my experiments that needs to be shown properly and described taking into account the statistics. Time ...

• Replies: 1
• Views: 1,677
02-06-2013, 12:22 PM
52. ### comparing score? wilcoxon signed rank test

hey guys a little bit of question from me about test used for comparing score my data is normally distribute but i use Wilcoxon to compare...

• Replies: 2
• Views: 1,319
02-06-2013, 11:44 AM
53. ### Normal distribution theoretical moments

how we can show that the follwoing equility holds E=0 E=0 E=0 E=0

• Replies: 3
• Views: 1,548
02-06-2013, 10:21 AM
54. ### Co-efficient of variation to eliminate frequency bias in vector

0 down vote favorite I need to determine the significance of a certain variable (i.e. cue) that co-occurs with an element of a particular...

• Replies: 0
• Views: 859
02-06-2013, 09:32 AM
55. ### Product A vs. Product B: How many visits to my website do I need?

Let's say I have a website and I wanted to see if I could promote certain products through advertising on Google. On a given day, Product A...

• Replies: 1
• Views: 1,362
02-06-2013, 07:46 AM
56. ### Daily samples of a measure- how much variance is there for each participant?

Hi guys, I have a set of data where someone has collected a measure of performance on a motor task every day from the same participants (N=9) for...

• Replies: 0
• Views: 1,060
02-06-2013, 05:45 AM

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