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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: 196,557
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: 66,616
09-30-2005, 09:44 AM
1. ### Outlier

Hi, Is there any way to find outlier without having the distribution of data? Thanks and Regards

• Replies: 4
• Views: 1,713
03-20-2013, 04:55 AM
2. ### Distributions and means - confidence interval question

Hi folks, :wave: I think I did my research but I would like to be sure before continuing. My task is to find the mean price of a given item in...

• Replies: 1
• Views: 940
03-20-2013, 03:17 AM
3. ### Normal distribution function

Hi, Is the following integral equels to F(z)(distribution function for standard normal distribution at point z) but we dnt know which distribution...

• Replies: 1
• Views: 924
BGM
03-20-2013, 02:58 AM
4. ### Statistic query

If im looking at current method vs new method for 8 specimens - 1)Semis vs Semis 2) Ultras vs Ultras and instead i look at statistics to score...

• Replies: 0
• Views: 769
03-20-2013, 02:26 AM
5. ### Determining causality of model

Suppose you have the model: X_{t} = 0.2*X_{t-1} + 0.3X_{t-2} + w_{t} + w_{t-1} + w_{t-2} where w_{t} is WN(0,\sigma^{2}). How would you express...

• Replies: 0
• Views: 843
03-19-2013, 07:49 PM
6. ### Writing model in terms of backshift operator

Suppose you have the model: X_{t} = 0.2*X_{t-1} + 0.3_X_{t-2} + w_{t} + w_{t-1} + w_{t-2}

• Replies: 0
• Views: 871
03-19-2013, 07:40 PM
7. ### Need help

I want to analyze the correlation and the significanse between blood test cound (continous variable) and another continous variable- which test shoul...

• Replies: 4
• Views: 1,671
03-19-2013, 02:27 PM
8. ### How do I analyze the results of a simple standard error test (with 95% confidence)?

Hi I'd be really appreciative if anyone might be able to help me. I'm studying biology at a foundation level and have recently been introduced to...

• Replies: 0
• Views: 679
03-19-2013, 12:38 PM
9. ### Using MDP toolbox in R

I have a data set with 2 state spaces (for which I've already generated a transition matrix). The form of the transition matrix is the following...

• Replies: 0
• Views: 2,259
03-19-2013, 12:21 PM
10. ### Help with a basic question about the role of weights in SPSS

I'm helping someone out with kind of a cruddy dataset, I was hoping I could ask a question about how weights work in SPSS and if I'm thinking...

• Replies: 3
• Views: 1,514
03-19-2013, 11:51 AM
11. ### Chi-square or McNemar test when data is not totally independent ?

Hello , I have data that could be match between 40% up to 90% , should I use chi-square or McNemar test ? Thanks

• Replies: 0
• Views: 775
03-19-2013, 11:16 AM
12. ### Regression Model

Question : Exam 1 Scores, 92, 87, 91, 86, 97, 97, 94, 71, 61, 77, Exam 2 scores, 70,83,93,87,97,97,93,87,73,87.. N=10 Create a Simple...

• Replies: 1
• Views: 881
03-19-2013, 10:38 AM
13. ### about "two factorial nonparametric analysis ",help

what is two factorial nonparametric analysis? is there any difference between it and cmh chi-square? can i use sas software to do it?

• Replies: 0
• Views: 898
03-19-2013, 02:50 AM
14. ### Having hard time coming up with an null hypothesis for one way Anova

My independent variable is assessment of whether respondents fear that crime is the worst problem in their city, and this assessment has 3 catagories...

• Replies: 2
• Views: 1,587
03-18-2013, 09:20 PM
15. ### Comparing the accuracy of two diagnostic tests applied on the same sample

Hi there, I have recently come across some data that compares the accuracy of two diagnostic tests. We have 214 samples which are tested positive...

• Replies: 3
• Views: 3,943
03-18-2013, 08:57 PM
16. ### Expected value of the sum of the absolute value of iid random variables

How do you go about finding the expected value of the sum(abs(X_i)), i=1,...,n? The X_i are iid Normal with mean 0 and variance theta.

• Replies: 1
• Views: 3,807
03-18-2013, 01:58 PM
17. ### chisq.test with correction

Hi, I Know with the data a c t 1 1 1 1 2 1 1 0 3 2 3 2 4 1 1 0

• Replies: 1
• Views: 905
BGM
03-18-2013, 01:31 PM
18. ### Help Deciding How to Set up Datasheet

Hey everyone, A bit stuck, attempting to do a statistical analysis for this research paper for my undergrad. I am basically looking at 3...

• Replies: 1
• Views: 960
03-18-2013, 12:37 PM
19. ### unbiased of minimum variance estimators

Hello, I need help with the develpment of this exercise that I'm trying to solve. Let \widehat{\sigma} be the U.M.V.Uestimate of \sigma when \mu...

• Replies: 0
• Views: 977
03-18-2013, 12:52 AM
20. ### Mixed Models Linear Regression in SPSS

Hello all, I am running a Mixed Models Linear Regression analysis in SPSS and I'm having trouble determining if I need to include both /RANDOM and...

• Replies: 0
• Views: 1,354
03-18-2013, 12:42 AM
21. ### Creating a score out of a "select all that apply" question

Dear Omniscienti, I asked the following question as my dependent variable: Which, if any, of the following actions has your household taken to...

• Replies: 4
• Views: 1,380
03-17-2013, 09:20 PM
22. ### How to rank long lists in Spearman's Rank Correlation?

Hi there, I have 2 lists of 1000 items and ranked them based on criteria A or B. When I want to compare the Spearman correlation at N=20 ,...

• Replies: 6
• Views: 1,470
03-17-2013, 09:20 PM
23. ### How to prove that a ranked list have more items from category A than B?

Hi I have a ranked list of 50 items, that consists of items that either belong to category A or B. Is there a way/test to prove with some...

• Replies: 5
• Views: 1,457
03-17-2013, 09:17 PM
24. ### Biodiversity indices comparison between 3 sites-Which test is appropriate?

Hi, i would appreciate some help on the following: I have to compare 3 different farming management systems (Organic, conventional, integrated) in...

• Replies: 1
• Views: 1,357
03-17-2013, 05:13 PM
25. ### Addressing intraclass correlation coefficient issues

ICC estimates changes according to the magnitude of the data. If the data are >1, ICC values are going to be way closer to 1 than if the data are...

• Replies: 0
• Views: 1,542
agp
03-17-2013, 04:28 PM
26. ### Logistic regression versus chi square test for RCT data

Hi My understanding of statistics is basic and mostly on an applied level, but now I have come into a discussion with my project leader and I'm...

• Replies: 10
• Views: 9,939
03-17-2013, 03:46 AM
27. ### Test of proportional changes

Hi all, I'm a transfer student trying to catch up on stats in my new program (the kids at my new university are a semester ahead of me) and I've...

• Replies: 0
• Views: 1,579
03-16-2013, 08:21 PM
28. ### SOFA a recommended tool in statistics

I was looking for a free tool and found SOFA Statistics which is an open-source statistical package, so I though to share it...

• Replies: 0
• Views: 1,115
03-16-2013, 03:41 PM
29. ### Help with statistical tests

Hi, I am new to statistics and am doing a project to test the degree of correlation between tree canopy cover and socio economic factors in given...

• Replies: 0
• Views: 1,149
03-16-2013, 11:15 AM

Hello all, I am new to the forum and wondered if i could ask for some advice regarding a suitable statistical test I could use to analyse some...

• Replies: 1
• Views: 1,318
03-16-2013, 09:04 AM
31. ### Statistics help

I am new to statistics and really need some help. Here is the title of my assignment: We are interested in whether there is a difference in the...

• Replies: 0
• Views: 872
03-16-2013, 08:06 AM
32. ### Inter Observer Reliability

Hi, I am trying to do an inter-observer reliability test in SPSS but with only one observer... if that makes sense, to ensure the consistency of...

• Replies: 0
• Views: 2,088
03-16-2013, 05:54 AM

Let me give you the gists of the problem. n=15 p=.65 x value=10 Okay, it's asking me that at least 10 flights are on time. Our Prof,...

• Replies: 7
• Views: 1,158
PSG
03-15-2013, 11:31 PM
34. ### Quick question about choosing stats tests

Hi guys, I'm sure someone out there will know the answer! I'm writing a paper looking at using two different types of staple to close surgical...

• Replies: 2
• Views: 1,088
03-15-2013, 05:16 PM
35. ### Calculate standard error of paired difference, based on standard error of each mean?

Hello, I am trying to do a simulation-based power analysis to see whether my experiment had enough power to detect an effect of a similar size as...

• Replies: 0
• Views: 2,247
03-15-2013, 04:06 PM
36. ### spearman rank correlation significance table using a tool

Hi I am using R to get the spearman rank correlation. However, the significance table of it need to be checked alone. I found several DIFFERENT...

• Replies: 4
• Views: 3,426
03-15-2013, 03:01 PM
37. ### How to compare a small sample to a large control group sample?

Hello, The prupose of my research was to measure the impact of a dropout prevention program. I used a survey consisting mostly of Likert scales...

• Replies: 1
• Views: 2,640
03-15-2013, 08:24 AM
38. ### Sas 9.2 proc genmod problem

Hello, I am currently stuck a bit with my model building using proc genmod. I need to save the model in order to be able to use it on the...

• Replies: 3
• Views: 1,664
03-15-2013, 04:03 AM
39. ### Definition of replications vs treatments (factorial design question)

I see on wikipedia replication is "the repetition of the set of all the treatment combinations to be compared in an experiment. Each of the...

• Replies: 2
• Views: 1,173
03-15-2013, 02:08 AM
40. ### Little help - patients in a hospital

So it has been many years since I did stats and need a little help. I am looking at the benefit of a specific laboratory test in a hospital...

• Replies: 0
• Views: 836
03-14-2013, 10:28 PM
41. ### Is a paired t-test appropriate in this situation?

Hello, I distributed a survey comparing to different types of maps: conventional (paper) maps and a virtual map. The maps were compared using...

• Replies: 2
• Views: 1,496
03-14-2013, 09:32 PM
42. ### Trouble with Calculating maximum Likelihood Estimate and Bayes Estimate

Hi, I solved this problem and just not sure if I can go even further. Suppose that X is a geometric random variable with density function ...

• Replies: 8
• Views: 2,635
03-14-2013, 04:37 PM
43. ### Panel data graphs in STATA using by command

Hi i am trying to make graphs using stata of panel data, with alot of stocks. The by variable i have to use is stock name, so that i get a two way...

• Replies: 0
• Views: 4,380
03-14-2013, 04:15 PM
44. ### ANOVA multiple comparisons corrections

How would you perform multiple corrections when using the same data for two separate ANOVAs? Example: Groups AAA, BAA, ABA, BBA, AAB, ABB, BAB,...

• Replies: 3
• Views: 1,715
03-14-2013, 03:33 PM
45. ### Calculating Significan Level and Power of a Test: Why's this answer correct?

Hello, I am having difficulties understanding the difference in calculating the level of significance and power for a test. For example, a...

• Replies: 2
• Views: 1,292
BGM
03-14-2013, 10:11 AM
46. ### Stats Test

I have already completed my online stats test, and the teacher is not grading them until after spring break... and I really want to know my score...

• Replies: 4
• Views: 2,404
03-13-2013, 11:01 PM
47. ### Help Needed - Statistical Analysis

Hi all, Firstly, I don't have much experience with statistics, so i hope i'll make sense! The Background I'm involved in a project with work....

• Replies: 3
• Views: 1,327
03-13-2013, 09:31 PM
48. ### Determining Distributions

I have two variables that I know are distributed as X^2(100) and N(100,15). The descriptive stats are: ...

• Replies: 1
• Views: 978
BGM
03-13-2013, 02:20 PM
49. ### Lilliefors confidence bounds

Hi community, would anyone know how to calculate these? I'd like to add them to some of my charts in excel.

• Replies: 0
• Views: 3,010
03-13-2013, 01:32 PM
50. ### Time Series Data- Fish Diet

My time series spans 13 years. There are 30-60 fish stomachs for each year of the study. Each stomach has typically 3-8 prey items inside. The...

• Replies: 0
• Views: 1,602
03-13-2013, 12:22 PM
51. ### statistical tests

Hi. I need you help, please!!!!! I have some data like this id a c t 1 1 1 1 2 1 1 0

• Replies: 8
• Views: 1,517
03-13-2013, 11:54 AM
52. ### How many samples do I need for allele frequency analysis?

Hi, I want to know a proportion of alleles in a population. If a genetic locus that I'm interested in is biallelic (i.e. two alleles: A & a),...

• Replies: 0
• Views: 949
03-13-2013, 12:22 AM
53. ### Help in Stata; Simulation

Hello All, I am a beginners user in Stata and I am working on an assignment that requires me to run a simulation for a regression function. I...

• Replies: 0
• Views: 1,476
03-12-2013, 04:26 PM
54. ### Multiple comparison test, with ambiguous labels/ranks

In a clinical study, I have patient's health condition labeled as grade 1, 2, or 3. Some patients are labeled as "Either 1 or 2" by the doctor,...

• Replies: 3
• Views: 1,756
03-12-2013, 03:07 PM
55. ### SPSS Stats help URGENT

Hey guys, I am very sorry to bother you but I am wondering if you could help me with a Stats question for a project I am working on. It is bit...

• Replies: 1
• Views: 984
03-12-2013, 10:55 AM
56. ### Statistics question

Hi I am working on a project and would like people's opinions on the statistics, if possible? I am looking at a new processing and cutting...

• Replies: 1
• Views: 1,135
03-12-2013, 07:55 AM
57. ### direction of association between nominal and ordinal variables

Hello, I have a question about which test are appropriate to find direction of association between a nominal and an ordinal variable. I have...

• Replies: 1
• Views: 2,176
03-11-2013, 04:19 PM
58. ### Time-Varying VCV Matrix

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• Replies: 0
• Views: 2,011
03-11-2013, 07:38 AM
59. ### Statistical tests

Hi. I need to compare two groups of data. And a person told me that I can apply a A, M or t test. A t test I know. But, what is a A or M test?...

• Replies: 7
• Views: 1,551
03-11-2013, 05:29 AM

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