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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: 197,114
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: 66,931
09-30-2005, 09:44 AM
1. ### Help please, maximizing function w/respect to one x variable

OK, so I'm working on this hw assignment (I'm a grad student, and for this class this is for knowledge, not points). We were given a large data set...

• Replies: 2
• Views: 2,391
BGM
02-24-2013, 11:57 AM
2. ### Problems with choice of test(s): GLM, ANOVA, correlation

Hello all Before I begin, let me say that I am sorry if this post is in the wrong section. Also, I'm sorry if this question is stupid. I am not a...

• Replies: 0
• Views: 1,800
02-24-2013, 07:57 AM
3. ### Main effects but no correlation..?

Hi all, I run a two way analysis of variance and got significant main effects of type of stimulus (2 levels) and group (3 levels) but no...

• Replies: 2
• Views: 2,385
02-24-2013, 07:37 AM
4. ### Which test for comparing before/after and control groups?

Not sure which hypothesis tests would be best in these three scenarios: 1. Compare Before & After Scores Students take a course, with a pre-test...

• Replies: 0
• Views: 1,370
02-24-2013, 03:22 AM
5. ### paired samples t-test vs. repeated measures (controlling for a variable) on SPSS

I just dont get my head around this.. I used paired samples t-test to compare high anxious subjects' memory for variable A and variable B. There was...

• Replies: 1
• Views: 2,369
02-23-2013, 02:59 PM
6. ### Data will not normalize & need to run ANOVA

Hello, I have a set of data that I need to run a 2-way ANOVA on. My data is very highly skewed to the right, so it does not follow a normal...

• Replies: 6
• Views: 9,239
02-22-2013, 06:55 PM
7. ### What test to use? Correlation/regression VS ANOVA

Hey all, I am working on my final year dissertation and could use some help because I have a very shallow understanding of statistics. I...

• Replies: 5
• Views: 3,199
02-22-2013, 06:10 PM
8. ### Absolute beginner needs help deciphering question

Hi there. I am an absolute novice to statistics, and have had no formal education in it since year 9 at school when we did box-plot diagrams. I...

• Replies: 7
• Views: 1,493
02-22-2013, 06:06 PM
9. ### measures of variation

Three classes of math students took a test and received the following scores Class I Class II Class III X=72 ...

• Replies: 3
• Views: 1,830
02-22-2013, 05:43 PM
10. ### Pearson Chi Square test on Extremely large sample size

Hi guys I am new to this forum. I am working with Pearson Chi-square statistics when I run into a problem. I have a sample size of 89000 and I...

• Replies: 4
• Views: 11,836
02-22-2013, 04:03 PM
11. ### measures of variation

An instructor compared two teaching techniques to see which was most successful in reaching the students. Results of the experimental and control...

• Replies: 7
• Views: 1,573
02-22-2013, 03:22 PM
12. ### Uniform most powerful test

Hi all, I am new here :wave: I got a question listed below. Thanks for your generous help. Let X1;...;Xn be a random sample from the uniform...

• Replies: 4
• Views: 2,631
02-22-2013, 11:20 AM
13. ### Hosmer Lemeshow goodness of fit test - grouping

Hello, I need to perform Hosmer-Lemeshow test for logistic regression, but I'm not sure how to group data (continuous variable - interval 0-1). ...

• Replies: 0
• Views: 879
02-22-2013, 09:13 AM
14. ### Finding the p-value for two samples which are not normally distributed.

Hello, I am doing medical research and I have gathered data for two groups of patients with different characteristics. The data for each of the...

• Replies: 8
• Views: 2,542
02-21-2013, 10:01 PM
15. ### sketching distribution

I am taking a tutorial online and I ran into a quiz but I am totally new to stats..could someone help with the question below? Thank you very much in...

• Replies: 8
• Views: 1,955
02-21-2013, 12:40 PM
16. ### two contingency table

When i use chi square , odds ratio and difference of proportion got similar findings. Which may be the best statistic for this type of research...

• Replies: 0
• Views: 1,014
02-21-2013, 12:32 PM
17. ### Using the McNemer test

Hi all. I hope this is the right forum to ask this question. Anyway, I need to compare the results of 2 questions that each of the participents...

• Replies: 4
• Views: 1,383
02-21-2013, 11:34 AM
18. ### Xbart Chart-Missing Data(correct sum) Question

Good Morning, I'm in a business statistics course and I understand how to make a xbar and rchart in excel when all the data is available to me,...

• Replies: 0
• Views: 1,503
02-21-2013, 09:32 AM
19. ### Correlation between radiological sign and clinical symptom: choosing the test

Greetings, I'm new to the forum and very rusty on statistics. I'm studying to learn enough autonomy, but I really can use some of your kind help :) ...

• Replies: 0
• Views: 1,010
02-21-2013, 06:39 AM
20. ### Maximum likelihood estimate two uniform distribution

X ~ (Uniform , with probability 1/2 , (Uniform , with probability 1/2 ; (theta > 0). The following sample is taken from the distribution...

• Replies: 1
• Views: 3,447
BGM
02-21-2013, 03:53 AM
21. ### Average

Hi... I have an average rainfall,minimum and maximum temperature data.so can I find average value of this three variable?Is it meaningful? ...

• Replies: 18
• Views: 3,131
02-21-2013, 02:25 AM
22. ### What statistical test do I need to use? PLEASE HELP!!

Hey guys, could use a little bit of help. I haven't taken a stats course since college (5 years ago). I am a little bit rusty. My boss wants me to...

• Replies: 4
• Views: 1,383
02-21-2013, 02:18 AM
23. ### Simulating and Estimating from Time Series

What is the best Rpackage to fit a time series?

• Replies: 2
• Views: 1,215
02-20-2013, 07:33 PM
24. ### Testing for the effect of a categorical variable in general linear regression

Hi, Hope someone can help? I have a data set which I have used to derive prediction equations for intramuscular fat (IMF) in the muscle of an animal...

• Replies: 1
• Views: 1,353
02-20-2013, 05:36 PM
25. ### ROC curve or other

I am trying to help prepare something for FDA. It involves 2-dimensional Western blots. The result is that for a particular condition, one has two...

• Replies: 1
• Views: 1,162
02-20-2013, 04:16 PM
26. ### Cluster analysis - longitudinal variation in results?

Hi, I'm wondering if there are any feasible ways in which to look at longitudinal data using cluster analysis. I've got four years worth of data...

• Replies: 3
• Views: 1,892
02-20-2013, 11:24 AM
27. ### probit vs. logit regression

What is the difference between PROBIT and LOGIT regression? How can this difference change the description of analysis results?

• Replies: 10
• Views: 6,675
02-19-2013, 08:36 PM
28. ### Width of CI comparison, Slutsky vs. Approximation

Hello, I am working on a problem right now where I am trying to prove the following: for any 0 < p < 1 , P(W_{n} \le V_{n}) goes to 1 as n...

• Replies: 4
• Views: 1,687
02-19-2013, 07:32 PM
29. ### Integration problem once more

I'm working with an apARCH model and need to find a percentile for r_t+2. In order to make presentation of the problem simpler I use an ARCH...

• Replies: 1
• Views: 2,575
02-19-2013, 05:59 PM
30. ### Best fit, standard deviation, and R2

Hi, I am wondering if someone can help me with a fairly basic question. I am looking at whether power, linear, or exponential curves fit a set of...

• Replies: 3
• Views: 27,135
02-19-2013, 03:11 PM
31. ### Best guess for the next value from a set of fairly random values

Hello there, I've been searching the forum trying to find a discussion on this topic, and the only thread I've found is this one, which ended...

• Replies: 2
• Views: 3,135
02-19-2013, 02:04 PM
32. ### What type of ANOVA/model to use for hypothesis test?

I am trying to work out the most appropriate way to analyse some data from an experiment and would be really grateful for any ideas. The experiment...

• Replies: 6
• Views: 1,751
02-19-2013, 12:54 PM
33. ### Statistical tests

Hi. I have two groups with different dimensions to compare distributions. I need to do some statistical tests, like chi-square test, but with...

• Replies: 4
• Views: 1,455
02-19-2013, 12:51 PM
34. ### time series analysis

I have several series (~30) of observations. Each of them consists of 500 values​​. Can I find in them the same effects by statistical analysis?...

• Replies: 1
• Views: 1,274
02-19-2013, 12:34 PM
35. ### which test (help)

hi let's say that i want to measure a strength of a part of a body and i want to see if there is a side that is stronger. But i don't want to...

• Replies: 4
• Views: 1,476
02-19-2013, 02:47 AM
36. ### Which post hoc statisticcal analysis? (help)

hi friends, I need an advice about the which analysis I should use. I made a MANCOVA and I have 3 groups one is for control group, the other two were...

• Replies: 6
• Views: 1,886
02-18-2013, 11:49 PM
37. ### law of expected value and variance question

Hi guys, kinda new here and would really appreciate some help. i'm stuck on a problem related to the law of expected value and variance. ...

• Replies: 2
• Views: 2,549
02-18-2013, 09:42 PM
38. ### Question Regarding Poisson (I think)

Hello, I have a question, whereby I already have the answer. What Im struggeling with is, where exactly these numbers were obtained, and was...

• Replies: 4
• Views: 1,560
02-18-2013, 06:35 PM
39. ### Question regarding studentized range statistic

I have been reading about it from http://www.vassarstats.net/textbook/ch14pt2.html. But now i am confuse how to calculate Qcv. Assume i have this...

• Replies: 1
• Views: 1,769
02-18-2013, 05:21 PM
40. ### ROC Curve Help

I have been reading about ROC curves...but I am still a little lost on how to apply them. What I am trying to do is specificity/sensitivity of...

• Replies: 0
• Views: 1,219
02-18-2013, 05:18 PM
41. ### Method to analyse wind turbine data

Dear All, I wish to find a method to analyse our wind turbine health montoring data flowing every minute. (126 parameters (power, speed,...

• Replies: 2
• Views: 1,565
02-18-2013, 12:37 PM
42. ### Non-linearity and correlations

I understand that Pearson's R is highly influenced by non-linear data. I am less clear if this is true with Spearman's Rho or in any case how serious...

• Replies: 2
• Views: 1,163
02-18-2013, 12:00 PM
43. ### Can you index means?

If I have a data set which has three sub groups, each of a different size and with a different mean can I index the means to adjust for the...

• Replies: 2
• Views: 1,648
02-18-2013, 11:28 AM
44. ### Statistics. Determining the mean.

Hello! Can someone help me please with this exercise? The Kentucky Derby is held the first Saturday in May at Churchill Downs in Louisville,...

• Replies: 1
• Views: 5,566
02-18-2013, 05:13 AM
45. ### Question regarding T-Test

would choosing a large/small nominal level for type-i error in t-test to while comparing 2 groups means ?

• Replies: 3
• Views: 1,761
02-17-2013, 10:29 PM
46. ### Confidence Intervals for Pairwise Independant Normally Distributed Samples

Good day, I have been thinking over this exercize for a couple of hours now and I have trouble finding a starting point. Suppose that X1,i iid∼...

• Replies: 0
• Views: 1,433
02-17-2013, 08:58 AM
47. ### Mutually inclusive and collectively exhaustive

I need 1- An event that is mutually inclusive but not collectively exhaustive 2-An event that is collectively exhaustive but not mutually...

• Replies: 1
• Views: 4,600
BGM
02-17-2013, 08:46 AM
48. ### Coefficient of Determination

Data Set Follows CARS X(Wight/Pound) Y(MPG) 1 3762 19 2 3988 18 3 ...

• Replies: 2
• Views: 1,202
PSG
02-17-2013, 01:02 AM
49. ### Hi! im looking for which advance data analysis is actually helpful to real life.

Hi! I really really need real life examples of how and which advance data analysis you personally can use to help in your life. so no basic stuff...

• Replies: 22
• Views: 4,249
02-17-2013, 12:36 AM
50. ### Integration problem

I have a problem regarding calculating some timeseries probabilities. I need to evaluate: \int \phi (\delta + a \epsilon^2_{T+2}, \alpha...

• Replies: 1
• Views: 750
02-16-2013, 08:29 PM
51. ### For satisfaction survey - How do I compare against "neutral"?

I am wondering how to do statistical analysis for a survey conducted on likability and usability of an application. I used a Likert 7-point...

• Replies: 4
• Views: 1,772
02-16-2013, 05:24 PM
52. ### Finding sum of mu(column)-mu

The question: I started with constructed an ANOVA table and worked backwards to get a value for SSE = 900 since I was dumb and thought ...

• Replies: 0
• Views: 1,722
02-16-2013, 01:38 PM
53. ### Calculating the mean and variance of a sampling distribution two different ways

Hello again! "Consider a population consisting of five values: 1, 2, 2, 4, and 6. Calculate the sampling distribution of the mean of a sample of...

• Replies: 4
• Views: 2,870
02-16-2013, 12:23 PM
54. ### Sample distribution of means and the minimum number of samples/population size

Hi, Im having some issues with 2 things, and would appreciate it if someone could clear things up. (1) Ive read that the mean of "the sampling...

• Replies: 1
• Views: 2,387
02-16-2013, 10:57 AM
55. ### Probability question

Hello, After major efforts, I am just incapable of solving the 2 question attached (below). A prompt answer would be great! Thank you in...

• Replies: 0
• Views: 1,737
02-16-2013, 09:29 AM
56. ### 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: 1,372
02-15-2013, 10:14 PM

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