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# Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

1. ### Sticky: Proof of the day

In this thread we post one (or more if you can't wait) proof a day. I'll start by proving the that V=\sigma^2(X'X)^{-1} in the linear...

• Replies: 14
• Views: 18,695
10-11-2014, 12:02 PM
1. ### Markov Chain Prediction with unknown states

down vote favorite 2 I want to make a prediction of the next state based on a training and test dataset. So I split my data into a train and...

• Replies: 0
• Views: 1,446
01-28-2013, 10:56 AM
2. ### Empirical QQ-plots for binomial GAM?

Hello everybody I've nearly finished my first binomial GAM analysis (presence absence data). I've been looking for ways to validate my models....

• Replies: 0
• Views: 1,863
01-28-2013, 03:45 AM
3. ### Hot deck imputation issues

Background: I had a data set containing 212 observations with a lots of missing values. Most of the IVs and DVs are categorical (DVs are ordinal)...

• Replies: 0
• Views: 1,505
01-28-2013, 02:12 AM
4. ### Interpretation of correlation coefficient

Hello, I am working on a meta-analysis with the program R. Here I am investigating the relationship between the dependent variable "participation...

• Replies: 7
• Views: 1,478
01-24-2013, 01:29 PM
5. ### Correlation vs ANOVA

Hi, I am trying to figure out which type of statistics to use for my research project. My knowledge of stats is limited so hopefully this makes...

• Replies: 6
• Views: 12,652
01-23-2013, 04:18 PM
6. ### Can a Power Analysis be done on a time series?

I've been doing a lot of reading on the "New Statistics" and I'd be very interested in determining the statistical power of my models based on...

• Replies: 0
• Views: 1,680
01-22-2013, 10:53 AM
7. ### categorical variable as covariate in ANOVA?

Hi, I have a within-subject factor with 3 levels and find no main effect when I do an ANOVA. I kind of predict that this is due to the...

• Replies: 1
• Views: 3,081
01-22-2013, 10:47 AM
8. ### Ratios of dependent variables

Hello, I am conducting some research into tool marks. I have two sets of tool marks (A) and (B). I am trying to ascertain whether the tool...

• Replies: 3
• Views: 1,509
01-22-2013, 10:08 AM
9. ### ANOVA and quadratic terms?

Hello everyone! I have what I think is a relatively straight-forward 3-way factorial ANOVA design. One of my factors (which is "number of...

• Replies: 7
• Views: 4,771
01-21-2013, 11:33 PM
10. ### Hosmer_ Lemeshow test

Dear teachers, In SPSS I ran a uniariate logistic regerssion to use the statistically significant ones in the multivariate logistic regression. I...

• Replies: 3
• Views: 2,872
01-17-2013, 05:15 PM
11. ### How to predict a model with multiple factors?

Hi, My question is probably trivial but I cannot figure it out... I'm doing a glm with multiple continuous and categorical predictors. In R, the...

• Replies: 0
• Views: 1,400
01-16-2013, 09:59 AM
12. ### Assistance with Statistical Methodology to address research problems

Im looking for some help with a statistical method(s) that can support the research questions i am looking to answer. I am basically doing research...

• Replies: 1
• Views: 1,482
01-15-2013, 04:08 PM
13. ### Multiple regression with correlated predictors to check for explained variance

Hi all, I have two predictive and one response variable and I'm trying to develop a model for predictions. Both predictors fit well (one slightly...

• Replies: 3
• Views: 1,595
01-15-2013, 03:30 AM
14. ### Log-likelihood MLE Markov chain

Hey! I am currently working with Markov chains and calculated the Maximum Likelihood Estimate using transition probabilities as suggested by...

• Replies: 0
• Views: 1,760
01-14-2013, 09:39 AM
15. ### Assumption of variables for Factor Analysis

Hi, In wikipedia page of Factor Analysis it states:Suppose we have a set of p observable random variables. Does it mean that we can use this method...

• Replies: 2
• Views: 1,389
01-13-2013, 03:04 PM
16. ### What are all the research areas with a core focus on time series applications?

I want to do an applied time series research paper outside of finance/economics. My question to you guys is what are all the areas where applied time...

• Replies: 0
• Views: 1,139
01-12-2013, 12:30 PM
17. ### Analyzing Gentrification with Data

Hello, I am developing a masters thesis which will attempt to utilize census tract data to assess the occurrence of gentrification in Washington,...

• Replies: 0
• Views: 1,289
01-11-2013, 07:32 PM
18. ### Factor Analysis vs. Principal Component Analysis

I've asked this question on here a while back but didn't quite get an answer that helped me understand what is truly different about these two...

• Replies: 8
• Views: 4,136
01-09-2013, 07:31 PM
19. ### Suggestions for market research books

Dear All, Can anybody suggest me useful market research books? Thank you.

• Replies: 1
• Views: 2,259
01-09-2013, 01:26 PM
20. ### mixed model nested ANOVA

I have been trying to run a three factor ANOVA in Statistica 8.0. My experimental design leads to nested, random and non-random factors: Site ...

• Replies: 0
• Views: 1,843
01-07-2013, 09:36 AM
21. ### about random walk Metropolis algorithm

Our model is: Y is distributed from a Negative binomial(r,p) where log(p/1-p)=xb. The prior of b is a multivariate normal(mu0,...

• Replies: 3
• Views: 2,191
01-06-2013, 07:50 PM
22. ### How to deal with a categorical response and continuous and categorical predictors?

Hi all, I have a large dataset of categorical and continuous variables, the observations are animal species. I want to test which variables are more...

• Replies: 2
• Views: 2,166
01-02-2013, 02:23 AM
23. ### Can I use standard deviation in Likert scale (1-7) data with non normal distribution?

I have 20 questions, each divided in 6 Likert scale items (1-7), representing 6 different values like Success, Oportunity, etc. The sample is rather...

• Replies: 3
• Views: 4,744
12-31-2012, 05:39 PM
24. ### Do you need to satisfy assumptions in regression if you do 10-fold cross-validation?

I wanted to get your opinion on this. When building models we want to make sure that the variables we have selected can be used in a model to predict...

• Replies: 10
• Views: 2,434
12-29-2012, 06:48 AM
25. ### Two way Anova+post hoc tests plz help

I have three treatment groups I II &III, i tested rate of wound healing in the three gps vs several variables using the two way anova ,gender...

• Replies: 0
• Views: 2,192
12-29-2012, 03:44 AM
26. ### Multinomial Logistic Regressions in SPSS

Hello everybody! First of all, this is a repost, I don't know what happened with the original (maybe a mod deleted it without noticing me). ...

• Replies: 1
• Views: 2,498
12-25-2012, 11:25 AM
27. ### The joint normality of the two estimates for linear regression model

I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

• Replies: 13
• Views: 3,106
BGM
12-22-2012, 12:27 PM
28. ### Sample Size - Mathematical proof

Hi, I am currently trying to find out the mathematical proof for my chosen sample size. I have referred to the table below and found out that my...

• Replies: 2
• Views: 3,104
12-21-2012, 11:53 AM
29. ### need help with research paper

Hello! I apologize in advance for being "statistically" dumb. I am writing a research paper, very brief one for 3000 words. Basically, it's...

• Replies: 0
• Views: 1,222
12-20-2012, 02:33 PM
30. ### Zero Inflated LOGISTIC Regression?

Hello all, I recently gave a presentation describing my use of logistic regression (YES/NO response variable) and someone suggested that because...

• Replies: 2
• Views: 10,042
12-19-2012, 09:09 AM
31. ### which type of ANOVA?

N mineralisation is dependent variable. Management type (4 types) and position in valley (3 positions; nested in valley (with valley nested in...

• Replies: 2
• Views: 1,820
12-19-2012, 07:35 AM
32. ### Levene's test of equality of error variances Repeated measures

Hello all, RE: Levene's test of equality of error variances Repeated measures...What do I do if one of my time points is significant (not equal...

• Replies: 0
• Views: 3,314
12-18-2012, 04:18 PM
33. ### Which statistical data analysis test(s) should I be using?

Please Help! I want to see if there is an effect of treatment (independent, fixed, continuous, 4 different types) on soil properties (dependent,...

• Replies: 0
• Views: 1,293
12-18-2012, 02:20 PM
34. ### Minimum # of ____ in SPORTS

Hello all, I am working on something that does not actually involve sports but my situation is exactly like something often used in sports...

• Replies: 3
• Views: 2,080
12-18-2012, 07:59 AM
35. ### LGC with Experimental Manipulations

Hey gang, first time posting. So, I have 9 time points of continuous learning data for 200ish people. I also have two manipulations (thus the 200...

• Replies: 6
• Views: 1,790
12-17-2012, 11:49 AM
36. ### What's the name of this distribution? (pdf ~ gaussian times x)

Hi My apologies if this a simple question but, despite extensive searching, I seem unable to find an answer and I don't know the correct terms to...

• Replies: 4
• Views: 1,230
12-17-2012, 03:14 AM
37. ### Need clarification on ANCOVA's assumption of linearity - how strict is it?

Dear forum members, I need help understanding whether or not a data set in which there is no relationship between the dependent variable (DV) and...

• Replies: 0
• Views: 1,574
12-15-2012, 02:16 PM
38. ### Interval independent variable in binary logistic regression

Hi everyone: I am a bit new to logistic regression and I could use some advice. I am trying to discover the influence of various variables on...

• Replies: 0
• Views: 1,555
12-15-2012, 07:44 AM
39. ### How many subsamples from large sample should I draw?

Hi, I am working on an analysis where I compare 2 different samples, one Dutch and one US sample. The US sample is bigger than the Dutch sample...

• Replies: 3
• Views: 1,634
12-14-2012, 05:24 AM
40. ### HLM-Longitudinal Analysis: Moderation in level 2 variables?

Hi, I am creating a growth model using HLM 7 where Level 1 is Occasion and Level 2 is Person. I am trying to see if I can test the moderation...

• Replies: 0
• Views: 2,983
12-11-2012, 07:11 PM
41. ### Hierarchical Linear Modeling

I have a question about independent variables in HLM. Does it matter if they are dichotomous or continuous? Are there any advantages to dichotomizing...

• Replies: 1
• Views: 2,315
12-11-2012, 07:02 PM
42. ### Help Calculating Significance Between 5 Elementary School Data

Hello, I am a school administrator in Oklahoma. I have five small elementary schools in my district. I often here from each of them that their...

• Replies: 2
• Views: 1,420
12-11-2012, 08:46 AM
43. ### Survey Question with 4 Point Likert Scale and Yes/No Question

Thank you for taking the time out to view my problem. My survey is based on observations and interviews. The observation questions are yes/no type...

• Replies: 4
• Views: 14,912
12-10-2012, 01:39 PM
44. ### Error Analysis with Binned Data

Our income data comes in increments of $5,000 from$15,000 onward. The [$0 to$15,000) is one way too big of a bin. In any case, we also have...

• Replies: 0
• Views: 1,525
12-07-2012, 01:26 AM
45. ### Making graph of formula

My question is the following: I have the following formula Y=ax^2+ bx; I have the a and b value for 20 subjects in 3 conditions. I want to make...

• Replies: 1
• Views: 1,236
12-06-2012, 10:51 AM

My research study proposal title is: "Acute effects of aerobic exercise compared with standard medicinal treatments on the dysregulation of the HPA...

• Replies: 1
• Views: 1,916
12-06-2012, 01:33 AM
47. ### Identifying the better "performers" in groups of uneven population

Hello. If the answer to this question is out there, the internet has hidden it pretty well... I've got 5 groups, each with a different...

• Replies: 1
• Views: 889
12-04-2012, 04:29 PM
48. ### How to outperform a data set after doing Wilcoxon Sign-rank test??

help!!!! I am doing a research in nonparametric statistics. I have 2 set of pair-wise data (A & B). I want to show that A outperform than B. I...

• Replies: 0
• Views: 1,103
12-04-2012, 11:39 AM
49. ### Negative Pearson r ? Absolute value?

Help! I'm computing a Pearson Product-Moment Correlation and I get a negative r-value of -0.75. When I test for significance using a t-test, my...

• Replies: 7
• Views: 2,604
12-01-2012, 07:46 PM
50. ### too large p-value

Hi, I have a problem of interpretation of some results. The problem is the following: I have a model with 4 parameters I have N=55 data...

• Replies: 1
• Views: 2,544
12-01-2012, 07:57 AM
51. ### Gamma Poisson Mixture with finite Gamma

Dear all I am working with a Gamma-Poisson mixture distribution where (and this is not usual) the support of the Gamma distribution (in fact, I am...

• Replies: 0
• Views: 1,663
11-30-2012, 06:49 AM

Firstly...I'm an absolute stats novice. I am assessing the urinary toxicity of a procedure by comparing baseline and 6 week International Prostate...

• Replies: 0
• Views: 905
11-29-2012, 07:39 PM
53. ### Gibbs Point Process

Does anyone knows what is the aim of using Gibbs marked point process?! I read a paper that used this method to find the best configuration of...

• Replies: 0
• Views: 1,017
11-29-2012, 05:41 PM

Hi, We are doing a customer satisfaction analysis of our school canteen. We have made a factor analysis and made the factor scores. Now we...

• Replies: 3
• Views: 1,397
11-29-2012, 03:39 PM
55. ### How to test a hypothesis comparing two sets of likert item data

Hi, I want to test a hypothesis but my two variables use likert item data and I don't know if they can be tested together. For example, Q1....

• Replies: 6
• Views: 2,839
11-29-2012, 03:38 AM

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