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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,786
09-30-2005, 09:44 AM
2. ### 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: 196,807
07-16-2014, 11:01 AM
1. ### Hypothesises

Loblaws manufactures baskets on two different manufacturing processes. Because the management of this company is interested in determining if process...

• Replies: 1
• Views: 2,137
06-09-2009, 12:54 AM
2. ### Sample Sizes

You test whether a chocolate production process is achieving the standard output of 120 chocolates/batch. The standard population deviation is 5 and...

• Replies: 1
• Views: 3,156
06-09-2009, 09:58 AM
3. ### Population

As the governor of Illinois, you are contemplating on whether to call an election. You want one if you think more than half of the voters will vote...

• Replies: 0
• Views: 2,401
06-09-2009, 07:00 PM
4. ### Outliers

Hello there, I have data set of 5846 observations out of which 15 observations are outliers. I need to perform multiple linear regression which ...

• Replies: 1
• Views: 1,129
05-01-2014, 04:43 PM
5. ### can you compare bland altman plots?

Hi I want to compare 2 different measurements of the same thing using different devices/methods and have used a bland altman plot to decide if my...

• Replies: 3
• Views: 1,555
07-15-2014, 06:44 AM
6. ### Hypotheses Testing

Can someone tell me if my null and alternative hypotheses below are correct for this? Ho = Consumers shop online and in clothing stores equally....

• Replies: 0
• Views: 2,450
03-19-2009, 07:14 AM
7. ### Group Analysis- Help with interpretation

I need to compute within and between group sum of squares and to deduce if the grouping is justified. I have computed SS without a problem, but the...

• Replies: 0
• Views: 2,392
01-29-2009, 05:47 AM
8. ### Goodness-of-fits tests.

I honestly have no idea where to even start in this assignments. Any type of ell would be greatly appreciated. I can easily do the problems given in...

• Replies: 1
• Views: 1,712
11-26-2014, 12:21 AM
9. ### Data analysis for Likert scale means

I am not certain which test to apply for my data and any help will be gratefully received. I am told that I cannot use regression analysis with...

• Replies: 0
• Views: 6,344
03-30-2010, 04:57 PM
10. ### Need help with p-value and test statistic!

A manufacturer of insecticides has developed two formulations for new insecticides using two different compounds, A and B. To test the...

• Replies: 1
• Views: 4,735
05-17-2010, 12:41 AM
11. ### Two girls one bonferroni - adjustment according to which families?

Hey guys We are two girls in need of some statistical guidance in our bachelor project in medicine. As it is the easter holidays, our advisor is not...

• Replies: 0
• Views: 988
04-03-2015, 07:50 PM
12. ### Help with Repeated Measures Data Analysis

Hello, I have a very limited set of repeated measures data that are assessment scores over three years, with 1,055 participants who have a range...

• Replies: 3
• Views: 982
04-14-2016, 03:59 PM
13. ### Independent t-test - interpreting significance if sizes of samples differ greatly

Hello, I ran an independent t-test on two samples (composite scores of a health assessment for two different groups of youth by age category). ...

• Replies: 3
• Views: 1,264
04-19-2016, 02:49 PM
14. ### Reliable Change Index

Hello, If I have a sample of 137 individuals with three assessment results (first, 1YR follow-up and 2-Yr follow-up), can I calculate the Reliable...

• Replies: 0
• Views: 2,143
05-04-2016, 05:18 PM
15. ### Inter-Rater Reliability - Question Combines Stats and SPSS Procedural Components

Hello, I have a sample of 5,000 health assessments (with ratings from 1-5 on 7 dimensions that roll up to a composite score) completed on 1,400...

• Replies: 2
• Views: 891
07-28-2016, 03:27 PM
16. ### Ordinal data+ independent factors+Marketing analysis+SPSS= HELP!!!!

Hi, I desperately need help analyisng my survey data. Which tests do i use in order to test the relationship between my variables, and to see...

• Replies: 7
• Views: 3,356
10-26-2011, 09:07 PM
17. ### Should I use the t-test or not?

I am processing the data of an experiment where I look at how an increased social rank (1-20) in cattle effects the length of their heat period. My...

• Replies: 0
• Views: 1,006
10-27-2013, 04:35 PM
18. ### Ordered Probit Model for Panel Data in Stata?

Hi there, I am having a little problem with my ordered dependent variable 'Physical Integrity Rights (PIR).' I want to study the effects of...

• Replies: 0
• Views: 2,591
07-30-2013, 02:31 AM

Hi everyone. My name is Anne. I'm back to school to finish my degree. I haven't been in school since 1983. Psychological Statistics is my first...

• Replies: 6
• Views: 2,587
06-10-2008, 10:46 AM
20. ### hosmer lemeshow goodness of fit statistic

am running a series of regressions and have the HL GOF for each. Does anyone know if there is a scale which describes the fit for example if the...

• Replies: 0
• Views: 2,595
06-01-2011, 03:14 PM
21. ### confidence intervals logistic regression

I have two different models in stata One covers the period 1970-1999 and gives an odds ratio of 1.35 with a confidence interval of (1.10,1.64) ...

• Replies: 0
• Views: 1,971
06-09-2011, 01:34 PM
22. ### Including variance (error bars) with a binomial proportion

I have a list of chemicals, their assay test results, and a binomial column of whether or not the assay test result was high enough to be considered...

• Replies: 0
• Views: 2,888
08-04-2011, 12:23 PM
23. ### Interquartile Range

What is the interquartile range of a normal distribution of IQ scores with a mean of 100 and a variance of 225? I think it is 20. I found out the...

• Replies: 2
• Views: 1,863
06-12-2013, 12:29 AM
24. ### Large Sample Confidence Interval for the Mean - Problem is it right ???

The president of Jones Bank asked his research team to determine the average waiting time for its customer. A study of 100 customers was conducted...

• Replies: 3
• Views: 1,066
10-14-2016, 07:02 AM
25. ### 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: 1,060
03-20-2015, 09:19 AM
26. ### Analysing "consistency"

Dear Statistics People, I have a problem. I wish to track the pitch of a waveform which should be simple. I need to know if I have a waveform...

• Replies: 0
• Views: 1,996
04-23-2010, 10:56 AM
27. ### Which analysing technique do I use?

Hi everyone! First of all sorry for my bad English, but I am Flemish. I am currently working on a paper for school, about the relationship...

• Replies: 7
• Views: 1,813
03-03-2014, 11:48 PM
28. ### Creating index with a string

So I want to create an index for activity level. We have the following variabeles (I translated a couple of things to english, tis originally in...

• Replies: 0
• Views: 1,290
03-06-2014, 02:00 AM
29. ### How to select only 1 country in dataset SPSS out of many

I need to do an analyzes on the European social survey but only for 1 country : slovenia. How do I select that with SPSS? I tried with the...

• Replies: 0
• Views: 1,566
03-08-2014, 04:59 AM
30. ### What to do with missings?

I am computing a scale 'political participation' out of 7 questions that measure political paritcipation. For example: I voted in the last elections...

• Replies: 1
• Views: 1,373
03-27-2014, 12:34 PM
31. ### Multinomial logistic regression categorial scale question

I have data about political participation where respondents answers questions 7 (yes or no) that indicate some form of political participation. for...

• Replies: 1
• Views: 874
03-27-2014, 05:30 AM
32. ### 3-way vs 2-way ANOVA

I have done a 2-way ANOVA to check the impact of my 2 treatments (EXP, 2groups and INFO, 3 groups) on my dependent variable and got significant main...

• Replies: 0
• Views: 1,863
07-30-2012, 01:34 AM
33. ### how to report contrasts?

how do i report contrasts i did in a 2x3 anova, in my thesis?

• Replies: 5
• Views: 3,863
08-01-2012, 04:03 AM
34. ### Empirical Research from a Sample

Hi, Im looking for some help carrying out empirical research that I need to do for an assignment. The data is based on a sub sample of a survey given...

• Replies: 0
• Views: 1,310
12-04-2015, 09:38 AM
35. ### Covariance of items from a SLR

Hi I've got a couple covariance problems and I have 0 idea how to do these. Consider the SLR model y = Beta naught + (Beta one)x + E ...

• Replies: 1
• Views: 6,275
02-11-2010, 03:01 AM
36. ### Slope parameter info if intercept known?

Consider the SLR y = b +mx + e Where the intercept b is known. a) Find least squares estimator of m for this model. b) What's the variance...

• Replies: 8
• Views: 4,727
08-11-2012, 09:22 PM
37. ### Help: Dummy Variable Regression with two components

Here is the question: I was thinking it might look something like Y=B0+B1D+B2(X1i.D)...

• Replies: 1
• Views: 1,192
04-05-2013, 10:33 AM

Hello everyone. I have a process in which users complete a given task, and the time it takes them complete it is measured. An upcoming change to...

• Replies: 0
• Views: 1,154
10-17-2013, 08:33 AM
39. ### Logistic Regression and Panel data -Does it matter?

Hello everyone. I am still very new to statistics and am having an issue. I am presented with a loan level data set (thousands of loans over a 10-20...

• Replies: 0
• Views: 1,321
05-23-2013, 09:35 AM
40. ### Regression not correct model?

Hello everyone. I would like to develop a model that would "predict" future pre-payment rates of a given pool of loans. The question I have is, if...

• Replies: 3
• Views: 1,267
06-27-2013, 05:38 PM
41. ### Random Sampling Over time to make one random sample?

Hello everyone. I have an interesting question that was brought to me by a friend and I do not know the "correct" way to do it. Okay so basically,...

• Replies: 12
• Views: 2,882
08-30-2013, 12:42 PM
42. ### Productivity vs Quality, Ordering by process.

Hello everyone. I am very new to statistics and I have been given a rather generic direction and I am not sure where to being. Basically we have...

• Replies: 2
• Views: 1,462
10-21-2013, 10:55 AM
43. ### Sampling by Balance, not enough loans per bucket

Hello everyone. I Have been asked by a client to randomly sample loans from a distribution. The client will only pay for 150 loans, and they want two...

• Replies: 0
• Views: 1,226
11-22-2013, 10:39 AM
44. ### Logistic regression or simple frequency analysis

Hello everyone. I have been tasked with finding correlations between missing data in variable A comapred with the observations (groups) in variable...

• Replies: 3
• Views: 1,783
11-06-2013, 02:03 PM
45. ### Regression on multiple distributions within one dataset

Hello everyone. I am attempting to do a regression analysis on the sales price of a property. I have several variables of interest. The main ones...

• Replies: 0
• Views: 1,375
04-08-2014, 10:44 PM
46. ### Which model would be best to do this

Hello everyone. I have been given a data set and tasked with coming up with a way to compare different people (real estate professionals) to each...

• Replies: 0
• Views: 908
04-08-2014, 10:49 PM
47. ### Statistical Test for differences Across time Between Independent Groups

Hello everyone. I am trying to determine if there is a statistical model that would allow someone to test for differences between two different...

• Replies: 6
• Views: 1,672
04-10-2014, 07:04 PM
48. ### When can the normal be used to approximate the hyperGeometric?

Hello all. I know the normal can be used to approximate the binomial when p is not close to 0 or 1, and when the population is extremely large...

• Replies: 0
• Views: 1,475
04-09-2014, 07:40 PM
49. ### Sampling Broken into Multiple Groups: What's wrong with this?

Hello. I have a question where i have to determine what is incorrect with the following sampling methodology to determine sample sizes. The problem...

• Replies: 0
• Views: 1,236
10-09-2014, 08:09 AM
50. ### Time Series out of sample forecast period?

Hello everyone. It is my understanding that if one wants to built a time series model on data a time series that went from 2000 to today (2015)...

• Replies: 1
• Views: 1,002
03-05-2015, 03:41 PM
51. ### Calculating degrees of freedom when sample sizes are unequal

Hello, Apologies if this seems quite trivial (I'm afraid I don't have a statistics background). I have been conducting unpaired Student's t-tests...

• Replies: 2
• Views: 1,801
12-30-2013, 12:02 PM
52. ### Some confuse about Regression Model(with example)

I am a college student who has studied basic statistics. Recently, i have read a paper which call "Creating a Profitable Betting Strategy for...

• Replies: 0
• Views: 1,182
12-09-2014, 05:40 AM
53. ### Degrees of Freedom

Hi, I have tried to explain the concept of degrees of freedom as I couldnt find a satisfactory explanation of this concept on the internet anywhere....

• Replies: 0
• Views: 1,527
07-22-2011, 07:11 AM
54. ### difference between Critical Difference (CD) and Least Significant Difference (LSD)

Hi, I am Ansuman Biswas from India. I have just started working on basic of ANOVA in our chemical lab work. Can anybody tell me what is the...

• Replies: 1
• Views: 19,810
06-26-2010, 07:55 AM
55. ### 2 or more DV in the regression

Hello, I have 3 DV's and 10 IV's. I want to know for each dependent variable separately by which independent variable it is affected most? what...

• Replies: 0
• Views: 925
04-04-2013, 01:32 AM
56. ### Comparing unequal sized sample groups?

Hi all, I have conducted a survey which includes 40 likert scale questions and is targetted at two groups; adopters and non-adopters of a certain...

• Replies: 0
• Views: 3,437
Ant
07-21-2008, 04:58 AM
57. ### Survival analysis with long term survivors

Hi all, Hope someone can offer me some advice here. I need some help getting off the ground with running a survival analysis with long term...

• Replies: 2
• Views: 1,445
07-19-2012, 07:42 AM

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