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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### conditional logit model_help with data interpretation

0 down vote favorite I have performed a clogit following the instruction of Aizaki et al.2012 but I am not sure on how to interpret some results...

• Replies: 4
• Views: 3,086
12-09-2016, 09:26 AM
2. ### Logistic Regression - Predicted Probabilities with unknown variables

Hi all, I'm wondering about how to calculate predicted probabilities using a binary logistic regression model when one or more of the variables in...

• Replies: 2
• Views: 3,217
12-07-2016, 10:11 AM
3. ### Hello, I need some help please with two problems

Hey guys, I have been struggling in this class and I am down to the last week, I have to pass this homework and extra credit problem to pass the...

• Replies: 2
• Views: 2,763
12-04-2016, 08:13 PM
4. ### Regression for comparing two groups on one variable? And t-test with survey data?

Hi - I have two populations / groups that I need to compare on one variable. Now usually I would use a t-test or anova but ive been told that...

• Replies: 2
• Views: 2,755
12-02-2016, 04:41 PM
5. ### Multiple Logistic Regression question

Greetings, I have three categorical IVs and one categorical DV. However, the DV is a self-reported ranking from 1 to 4 (1= not important, 4 = very...

• Replies: 4
• Views: 2,592
12-01-2016, 01:46 PM
6. ### Which analysis represents better the "worse-ness" of my linear regression?

Hello all, If I have two sets of data points, for instance: 1 10 2 14 3 17 4 12 5 19

• Replies: 2
• Views: 2,845
11-29-2016, 07:12 AM
7. ### P-value for a regression where expected slope is 1:1

Hi, I am comparing two values for vegetation cover from two time periods. The expected value is y=x for the slope. I am curious how to calculate a...

• Replies: 6
• Views: 3,315
11-26-2016, 09:40 AM
8. ### Least squares estimate of alpha and beta

My group have different opinions towards the following question: Find the least squares estimate of alpha and beta of the mechanistic growth...

• Replies: 1
• Views: 3,109
11-24-2016, 10:23 AM
9. ### Standard Regression Analysis / urgent help for stats beginner.

Hi Guys! I'm fairly new to statistics and am conducting a standard regression analysis with 1 predictor variable ( following from a pearsons...

• Replies: 5
• Views: 3,119
11-22-2016, 12:57 PM
10. ### Nominal vs. Ordinal

Say i'm using age groups which are not equal in size and interval (1-2,2-4,5-8years) is it better when using a regression model to set this variable...

• Replies: 3
• Views: 2,629
11-21-2016, 04:40 PM
11. ### Poission with random effects

Hi, I have two levels in my poission regression model with random effects (children and family level) which predicts count data after i get the...

• Replies: 0
• Views: 2,490
11-20-2016, 04:37 PM
12. ### Help with multilevel multinomial logistic regression and missing data

Hi all - I would really appreciate some thoughts/advice. I'm working with survey data containing individual responses nested within a number of...

• Replies: 0
• Views: 2,332
11-16-2016, 04:42 PM
13. ### What experimental design would be most appropriate?

In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

• Replies: 0
• Views: 1,885
11-15-2016, 01:18 PM
14. ### logistic regression or survival analysis?

Hello, I have two main questions that I hope you help me answer. Let me give you the scenario first. Let’s say that some students in a school are...

• Replies: 4
• Views: 2,705
11-15-2016, 10:41 AM
15. ### How to parameterize this crazy data?

So, a colleague of mine, who is a survey methodologist, is proposing to do an experiment on a survey. * The purpose of the experiment is to see...

• Replies: 0
• Views: 2,162
11-14-2016, 07:00 PM
16. ### Post-Hoc Power Analysis (G*Power) for simple linear regression

Hey everyone! I conducted a simple linear regression with non-significant results. Now I would like to analyze the power of this calculation using...

• Replies: 0
• Views: 2,366
11-11-2016, 07:00 AM
17. ### Exam pass rate analysis

Hi, looking for some help with some analysis I am looking at on Minitab for exam pass marks. I have a data set which shows global student...

• Replies: 1
• Views: 2,329
11-10-2016, 11:47 AM
18. ### Have 4 dependent and 10 independent variables - which test should I use?

Hi all, I'm interested in the potential effects of water pollution on feather color of a bird. For this, I calculated 4 color variables for each...

• Replies: 0
• Views: 1,957
11-09-2016, 04:47 PM

Hi everyone, I'm trying to wrap my head around multilevel (or mixed-effect) models, but not quite succeeding. I have the following data from a...

• Replies: 0
• Views: 1,916
11-07-2016, 03:46 PM
20. ### Correlation with residuals of regression

Hi all, Let's say I have one DV (X) and 5 IV's, A, B, C, D and E. I'm specifically interested in the effect of E. I could perform a regression...

• Replies: 3
• Views: 2,514
11-07-2016, 10:18 AM
21. ### Test for comparing correlation values. The winner is?

• Replies: 2
• Views: 2,030
11-05-2016, 06:10 AM
22. ### Calculating predicted probabilities from a logistic regression model SPSS

Hello everyone, I am trying to calculate individual predicted probabilities from a logistic regression model with SPSS (to describe how a individual...

• Replies: 6
• Views: 5,656
11-01-2016, 03:52 PM
23. ### Calculation of parameter uncertainties when using method of least squares

Hi everyone, I am struggling with a maybe simple problem. I have a set of data points (x,y) for which I would like to derive a fitting function of...

• Replies: 1
• Views: 2,377
11-01-2016, 04:41 AM
24. ### Help with my hierarchal regression

Hi Guys I'm accomplishing a hierarchal regression for my thesis and I'm a bit stumped. My hierarchal regression is trying to assess the link...

• Replies: 3
• Views: 2,046
10-30-2016, 01:51 AM
25. ### bootstrap regression question

I have a slightly different twist on the normal application of bootstrapping and regression. Here’s the problem… I have a population of people...

• Replies: 1
• Views: 2,358
10-28-2016, 08:09 AM
26. ### Relative Weights Analysis | Any good step-by-step guides out there?

I am trying to conduct relative weights analysis on employee engagement data to prioritize where our org focuses its efforts. I'm running SPSS...

• Replies: 0
• Views: 1,236
10-25-2016, 02:03 PM
27. ### How to use Akaike's Information Criterion (AIC) for manual model reduction?

Hi all, I wondered if anybody can explain to me how I can use the AIC for manual reduction of my GLM. I calculate a GLM with the following...

• Replies: 1
• Views: 2,735
10-24-2016, 10:58 PM
28. ### Cross-sectional dependence, heteroskedasticity and serial correlation

*** solved

• Replies: 0
• Views: 962
10-24-2016, 02:51 PM
29. ### Basic Estimation; Should I use future data?

Hi everyone, I'm new on the forum but had a question to ask that's related to the work I currently do. I'm wondering if we should include...

• Replies: 4
• Views: 1,455
10-23-2016, 10:24 PM
30. ### Comparison of one outcome to all the other outcomes

Here is some data to play with set.seed(1e4) color = factor(c(rep("blue",20), rep("red",20), rep("yellow",150)),...

• Replies: 0
• Views: 1,443
10-23-2016, 06:58 PM
31. ### What p value to use for purposeful selection of variables for multivariate

To do purposeful selection of variables for multivariate, can I use a p value of 0.15 cut off to select those significant variables from univariate ...

• Replies: 1
• Views: 2,027
10-23-2016, 01:28 PM
32. ### Is univariate analysis a must before binary logistic regression

Could I enter all my independent variables directly for a binary logistic regression OR is it necessary that I should run a one way anova for...

• Replies: 8
• Views: 2,045
10-22-2016, 09:27 AM
33. ### How to handle non normally distributed residuals

Currently we are working with a GEE model, at this point we are having doubts about our residuals which are not normally distributed. Log...

• Replies: 0
• Views: 2,131
10-21-2016, 09:58 AM
34. ### Help with regression and related nominal values

Hey all. I'd like some input on a regression analysis. I have data that measures the reactions of individuals to a number of objects and to a number...

• Replies: 5
• Views: 1,364
10-20-2016, 10:25 AM
35. ### GLM on non-linear/curvilinear data

Dear all! I’m sure somebody of you will help me with my non-linear data-problem. I measured a fitness correlate of an animal (response variable)...

• Replies: 6
• Views: 1,762
10-19-2016, 07:54 AM
36. ### Defining relation of a fold over design

Dear All, I am reading the book DC Montgomery on my own. The book says that the defining relation for a foldover design will have L + U - 1 words...

• Replies: 0
• Views: 1,384
10-18-2016, 01:50 PM
37. ### Heteroscedastcty with large number of cases

I ignore here that I have populations commonly :p I have heard that heteroscedastcity is not an issue when you have large sample sizes (I have ten...

• Replies: 10
• Views: 2,966
10-17-2016, 01:21 PM
38. ### Multiple Regression study

delete this

• Replies: 0
• Views: 1,330
10-17-2016, 02:52 AM
39. ### Multicollinearity problem in binary logistic regression

I'd like to ask for some help with a binary logistic regression. In SPSS I am trying to build a binary logistic regression with 4 independent...

• Replies: 2
• Views: 1,671
10-16-2016, 01:52 AM

I have a very weird question which I guess is not replicated hopefully I can get an answer. when using the multiple regression analysis in excel via...

• Replies: 1
• Views: 1,028
10-15-2016, 09:42 PM
41. ### Type 1 error in regression with entire populations

I have read that you are not supposed to keep choosing different levels of the categorical variable to be the reference level, because this can cause...

• Replies: 14
• Views: 3,173
10-15-2016, 10:50 AM
42. ### Many predictors relative to cases, want to identify interesting ones

I've been helping a colleague with his research project. He is looking at the trustworthiness of profile texts. He is analyzing text entries using...

• Replies: 2
• Views: 1,068
10-14-2016, 02:31 PM
43. ### Interaction Terms in Linear regression

In R I used the linear regression call for three variables: y, x, and c Y and X are numeric where C is a dichotomous {0,1}. X and C are the...

• Replies: 1
• Views: 1,356
10-12-2016, 08:48 PM
44. ### Linear Regression coeffiecients used in Exponential Regression

I have a decay curve (y) with values 1, 0.75,0.64,0.54,0.46. The x values are 1,2,3,4,5. First a simple linear regression was performed (y =mx + b)....

• Replies: 0
• Views: 1,213
10-12-2016, 11:36 AM
45. ### Controlling for a variable in multiple regression creates significance of another var

I have continuous variables A, B and C. A/B correlates with C significantly. Neither A, B or A*B correlates significantly with C. In multiple...

• Replies: 1
• Views: 1,013
10-12-2016, 08:12 AM
46. ### Static & Dynamic variables in one model

Hello! My name is Valentina and I am a Master student, currently working on my MSc thesis. I am examining the effect of Politicians on the board...

• Replies: 0
• Views: 1,081
10-12-2016, 03:03 AM
47. ### Multivariate ''binary'' logistic regression...???

Hello all, My name is Nick. I am a doctor and i would appreciate any of your help in the above problem. Recently, on purpose to delineate/propose a...

• Replies: 3
• Views: 1,848
nok
10-11-2016, 01:55 PM
48. ### Regression Lines

Can someone please explain this to me In a random sample of 40 students, the mean number of hours spent studying is 7.5 with a standard deviation...

• Replies: 1
• Views: 1,147
10-11-2016, 11:48 AM
49. ### Country Variable

Hi Stata Experts, I have a question concerning an idea for my thesis. I have firm-specific data (assets, sales, income etc.) for different firms...

• Replies: 0
• Views: 1,271
10-11-2016, 08:27 AM
50. ### Regression after multiple imputation

Hello every one. I want to perform simple binary logistic regression after multiple imputation but I constantly get this message and the execution of...

• Replies: 5
• Views: 1,527
10-10-2016, 07:45 PM
51. ### Approximating the probability of an event occuring from the output of a Poisson GLM

Hi all, I have some data that includes the output of a Poisson Log Link model, that aims to predict how many times an event will occur over the...

• Replies: 2
• Views: 1,782
10-10-2016, 11:15 AM
52. ### Spearman's Correlation and Wilcoxon Signed Rank Test

Hey guys! I have an urgent question for my master thesis. In my thesis, I'm comparing 4 performance metrics. My data consists of 100 funds and...

• Replies: 0
• Views: 2,007
10-10-2016, 11:13 AM
53. ### Regression with additive and multiplicative predictors

Hi, we are analyzing pollutants in mussels with regression models. Let's say we have only the two predictors (1) "year" and (2) "month". However,...

• Replies: 8
• Views: 2,359
10-10-2016, 07:50 AM
54. ### OLS Regression w/ longitudinal data

I have a longitudinal data set with two waves. Several variables exist in both waves. I want to examine the following question with and OLS...

• Replies: 0
• Views: 1,875
10-07-2016, 03:33 PM
55. ### Postive correlation but negative coefficient in regression??

Im a little confused by some results I have..... I have two predictor variables and an outcome variable. The first predictor is positively...

• Replies: 23
• Views: 57,561
10-07-2016, 04:31 AM

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