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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Anova/Linear regression

I have two datasets, one collected by one instrument, say A, and one by another, say B, at the same time. I need to use instrument B to calibrate...

• Replies: 0
• Views: 1,981
01-30-2017, 05:45 AM
2. ### Estimate Residuals

Hi statistics experts, I run a usual regression model (1 dependent, different independent variables) for each industry-year and save the residuals...

• Replies: 2
• Views: 2,399
M90
01-29-2017, 12:03 PM
3. ### SPSS: regression analysis for 3x2 experiment. How to test for interaction

Dear all, For my research I have the following facts: - I have two categorical IVs: - treatment condition called competition, which has...

• Replies: 4
• Views: 3,005
01-29-2017, 04:19 AM
4. ### Help: regression analysis for categorical/binary exposure

Cell biologist in need of stats help! I am using stata to analyse my data and have two questions: 1. I have a continuous outcome (hippocampal...

• Replies: 3
• Views: 2,849
01-28-2017, 11:45 PM
5. ### Logistic Regression on SAS, all variables I put in to test are showing up as insignif

Hello, I need help really badly. I am using SAS to do my statistical modelling. I have several different categorical variables with the...

• Replies: 2
• Views: 2,754
01-27-2017, 09:49 PM
6. ### Comparison of Coefficients of two different Regression Models

Hi everyone, I am analyzing the impact of price and promotion activities on sales in two separate 2-Way-Fixed Effects models. One model is for...

• Replies: 4
• Views: 3,200
01-27-2017, 03:53 PM
7. ### Exp(B) or CI values with the letter "E"

Dear all, I am running a Multinomial Log. Regression. Everything seems fine but I do not understand when Exp(B) oder CI values are like...

• Replies: 6
• Views: 3,345
01-27-2017, 11:42 AM
8. ### Beta significance level in one model the same as the R-squared-change significance

I am very new to statistics, so apologies in advance if I have not explained this clearly. I have run two types of linear regression: - The...

• Replies: 1
• Views: 3,165
01-24-2017, 10:50 AM
9. ### what to do with "bad" logistic regression results

I ran a simple logistic regression in R and here are my results. my independent variables are all "counts" and I coded my Y as 0 and 1. This is a...

• Replies: 9
• Views: 4,340
01-23-2017, 12:18 PM
10. ### Finding predicted values with logged (ln) dependent variable.

Hello all, I'm currently working on my first quantitative project. I am doing an OLS regression in SPSS. I had to take the natural log of my DV in...

• Replies: 4
• Views: 4,240
01-23-2017, 11:16 AM
11. ### I think this is a simple question but I can't seem to find it in my stats book

I have a linear regression equation (y=6.0707x-1200.2) that was used to develop 50 point estimates. The sum of these estimates is the point estimate...

• Replies: 12
• Views: 3,350
01-20-2017, 02:29 PM
12. ### im a newbie and i need some help with regression :(

kayy... masters student here :wave: im so lost in my statistical analysis and my supervisor isn't really helpful :( for my model i have 3...

• Replies: 1
• Views: 3,403
01-20-2017, 12:30 PM
13. ### Deriving further values from regression coefficients

Hi, I’m hoping someone can help me. I’m trying to derive another value from the coefficients of two regression equations. I have 2 regression...

• Replies: 0
• Views: 1,993
01-19-2017, 09:43 AM
14. ### Math Help: How to Calculate Weights for Multiplicative Model with Dummy Variables

Hi Everyone, My question is how do I calculate weights for Y=W1X1*W2X2*WNXN where N is the number of independent variables. I could use...

• Replies: 1
• Views: 2,663
01-18-2017, 04:51 PM
15. ### How can this be true [linear versus logistic regression]

This comes from a government study that was used to generate something of great importance, funding and related factors for a major government...

• Replies: 17
• Views: 6,440
01-15-2017, 02:51 PM
16. ### Can data be classified as count data?

Hi, I have a dataset spanning two years which consists of individuals entering some process. Once they have entered this process I want to predict...

• Replies: 2
• Views: 2,953
01-15-2017, 08:38 AM
17. ### How to Fit polynomial regression by bootstrap and establishing IC of each parameters

#Hi everybody and excuse me for my bad english for this request on R. #here parameter of an hypothetical interval : ...

• Replies: 0
• Views: 1,967
01-13-2017, 08:28 PM
18. ### growth curve models

hi all, suppose my outcome is total yearly savings (\$). i want to use growth curve models to see how 4 different groups change in their savings...

• Replies: 0
• Views: 2,434
01-13-2017, 06:41 AM
19. ### Random slopes

Dear experts, When should I include random slopes in my non-linear mixed effects model? Is it solely when it results in a better Log...

• Replies: 0
• Views: 2,070
01-12-2017, 10:49 PM
20. ### Checking temporal dependency

Hi guys, this is my problem: I have performed some experimental tests (tomographies) on 40 samples. These samples are made by four different...

• Replies: 2
• Views: 2,945
01-11-2017, 01:12 PM
21. ### Dealing with temporal autocorrelation

Hi, assume we have a measured value for each year from 1990-210, and we want to estimate a linear trend. Now there is a problem of...

• Replies: 2
• Views: 3,009
01-10-2017, 11:39 AM
22. ### Mediation Output with Process

Hi, I am investigating a variable for its effect as a mediator with SPSS and Process but I have problems interpreting the output. First I...

• Replies: 0
• Views: 3,821
01-10-2017, 08:08 AM
23. ### What is spatial regression?

This is the first time I have heard of this technique . They are concerned with what they call spatial issues, for example how rural versus urban...

• Replies: 6
• Views: 2,751
01-09-2017, 02:41 PM
24. ### Statistical inference.

Hi there, I would like to ask a couple of basic questions: 1. What is the difference between estimation and hypothesis testing? I mean are they...

• Replies: 1
• Views: 2,812
01-09-2017, 02:01 PM
25. ### Individual versus aggregate regression

What is the difference between doing regression at an individual versus a aggregate level This is an example of what I am talking about for...

• Replies: 0
• Views: 3,170
01-07-2017, 02:09 PM
26. ### I want to learn to create ARX, ARMAX, Box-Jenkins and Output-Error

Hello. I'm am a control engineer and I want to upgrade my skills in simulation of dynamic physical systems. Normaly I describe my physical system...

• Replies: 8
• Views: 3,387
01-07-2017, 12:43 PM
27. ### 'e' in expected values in Poisson

Using this example (see below) could someone please tell me what the 'e' symbol stands for and how one would work out the expected values manually. ...

• Replies: 1
• Views: 2,570
01-05-2017, 02:43 PM
28. ### Data input- ordered logistic regression

Hello, I am trying to analyze the relationship between mode familiarity and Technology & demographic characteristics. So I have an ordinal dependent...

• Replies: 0
• Views: 1,822
01-05-2017, 09:09 AM
29. ### Regression analysis in R - which variables to include?

Hi all, I am doing causal research between the relation between a dependent variable Y which consists of 4 phases (so 4 dependent variables Y1,...

• Replies: 0
• Views: 2,555
01-05-2017, 07:45 AM
30. ### Is Using an Explanatory Variable that Defines My X-Y Pairs Correct ??

Hello My question is basic I guess: My data looks like this: obs date Y X 1 1/1/2010 5.6 3 2 1/2/2010 7.9 5 3 ...

• Replies: 0
• Views: 2,708
01-03-2017, 02:45 PM
31. ### weird difference between measures of Goodness-of-Fit ??

Dear stats friends I have run an ordinal regression in SPSS on 700 subjects I have data on an ordinal DV: heart disease score between 0 and 3. ...

• Replies: 2
• Views: 3,619
12-30-2016, 12:45 PM
32. ### Complicated Research quesiton

Im looking to do some research in the social science field and I have to do a statistical analysis of a complicated set of self report measures. I'd...

• Replies: 8
• Views: 3,873
12-30-2016, 12:33 PM
33. ### Calculating the multiple regression function via canonical correlation analysis

I've got one dependent variable and two independent variables. I need to calculate the multiple regression function via canonical correlation...

• Replies: 0
• Views: 2,714
12-29-2016, 02:35 PM
34. ### ANOVA - Does Welch's test assume homogeneity of variances, or not?

In other words, will it return a much smaller standard error when variance are unequal than Fisher's? Or is it not concerned with variance?

• Replies: 3
• Views: 2,729
12-28-2016, 09:46 PM
35. ### General linear model and residuals

Hi, i'm using SPSS for analysis of my data using general linear model with 3 independet factors (2 levels each) and one independent ordinal factor (4...

• Replies: 0
• Views: 2,614
12-26-2016, 12:55 PM
36. ### How to Compare B Coefficients within and between models in R?

Hello people, I am new to this forum and it would be great if some experienced people could help met out. I would like to know what the...

• Replies: 1
• Views: 3,887
12-25-2016, 04:16 AM
37. ### Newbie needs some help with his model interpretation

Hello, i am quite new in the world of statistical problems :) I have read some lecture notes and books to solve my current problem, but i am note...

• Replies: 0
• Views: 3,146
12-24-2016, 09:52 AM
38. ### Regression on estimated variables

I'm making a two-step analysis for my data. First Step: I've collected inflation and interest rate data for 25 countries in a monthly frequency...

• Replies: 2
• Views: 3,013
12-23-2016, 09:52 AM
39. ### Beginner's question: Is profit/loss data always ratio in nature? How to treat it?

Hello, I'm afraid this is another beginner's question. I've only recently grasped the fundamentals of linear and multiple linear regression and I...

• Replies: 3
• Views: 2,924
12-21-2016, 06:06 PM
40. ### Random intercept only for 1 subgroup in lmer

Dear all, suppose I have a case study with 3 different populations, A, B and C. For all groups I have data on, e.g. body mass, length and sex of a...

• Replies: 2
• Views: 2,957
12-21-2016, 12:12 PM
41. ### Calculating probabilities from logit parameters estimated with effect coding

Hello, I calculated this multinomial logit model using an effect coding (-1 0 1). The variable edu3 is the education level (3 categories), sex has...

• Replies: 0
• Views: 2,151
12-21-2016, 03:39 AM
42. ### moderation in SPSS vs. PROCESS

Hi. I did mediation and moderation analysis of one model in 2 programs: SPSS and PROCESS (macro). Mediation was the same, but moderation was...

• Replies: 2
• Views: 4,091
12-19-2016, 08:35 AM
43. ### 3-way ANOVA for paired groups and repeated measures or a GEE

Hi! I need help for data analysis of my masters.I work with awake rats in pharmacology experiments. In my experiment I have some groups of treatment...

• Replies: 2
• Views: 2,381
12-18-2016, 11:01 AM
44. ### When to use Augmented Dickey Fuller test vs Dickey Fuller Test - Time series

Checking a variable for I(1) process, when should i use a ADF vs DF test?

• Replies: 1
• Views: 2,574
12-17-2016, 12:30 PM
45. ### Trying to think of alternative methods to approaching my model for dynamic pricing

Right now i run a pricing experiment where 25%of users get one of 4 random prices. After collecting sufficient data, I split my data into training...

• Replies: 0
• Views: 2,417
12-16-2016, 10:37 AM
46. ### help in model

I have a data set like that ID Wight age sex season region response 1 60 40 1 4 2 1000 2 65 ...

• Replies: 1
• Views: 2,509
12-16-2016, 09:00 AM
47. ### Repeated Measures model with Covariates

Hi Everyone, i am struggling with finding a good way to analyze a dataset. The design is this: I have 25(n) subjects, all of them are tested in an...

• Replies: 1
• Views: 3,148
12-16-2016, 02:23 AM
48. ### How to calculate residual covariance in R

I know it is may be a silly question but I am looking for an answer if I fitted a linear model c<- lm (y~ a+ b) I need to get the residual...

• Replies: 1
• Views: 2,677
12-16-2016, 02:18 AM
49. ### Linear Regression - Beginner Need Help

Hello everyone, I have a simple exercise to do about linear regressions and models but I have a few doubts. The exercise gives you 2 vectors(let's...

• Replies: 4
• Views: 3,073
12-14-2016, 03:04 PM
50. ### Advice on OLS analysis

Hello Everyone, I’m writing a paper on the relationship between weather on daily public bike share system usage. I’m looking for a bit of advice...

• Replies: 0
• Views: 2,007
12-14-2016, 12:59 PM
51. ### Adaptive Lasso and CrossValidation for SNV selection

Hello everyone, I have available 17 000 variables (SNV frequencies, a certain number of zeros) for 40 patients. Each patient is represented by its...

• Replies: 3
• Views: 2,873
12-13-2016, 11:51 AM
52. ### SEM versus multiple regression?

Hello. I have a within-subjects longitudinal design with two time points. There are two DVs and 3 IVs. All are measured at both time points. I used a...

• Replies: 1
• Views: 2,429
12-13-2016, 10:41 AM
53. ### Mixed effects using nlme in R

If I include an interaction (time*score) in my model the main effect (score) is significant. However, if I remove the covariate (time), the effect...

• Replies: 3
• Views: 2,953
12-13-2016, 03:44 AM
54. ### mixed effects influence of interaction

Can someone confirm that the following are correct. I'm trying to model both the random intercept and random intercept/slope models. Random...

• Replies: 2
• Views: 2,578
12-13-2016, 03:25 AM
55. ### Poverty analysis and multiple linear regression

Hi. I have a dataset and I intend to use multiple linear regression analysis with excel since the dataset isn't that massive in volume, just about...

• Replies: 0
• Views: 2,546
12-12-2016, 07:37 AM
56. ### Urgent: data format in regression analyses

Hi all, I'm suffering a lit bit with some data I have to analyse (my first time...) and I have many doubts. We manipulated 3 IVs that were shown...

• Replies: 0
• Views: 2,279
12-10-2016, 11:13 PM
57. ### Regression with two data sets?

I have two data sets. Set 1 contains daily flights and delay data: Flight Date Carrier Departure Delay, ranging from 0 to 1650 minutes. ...

• Replies: 1
• Views: 2,402
12-10-2016, 10:35 PM
58. ### Need help with data for regression analysis

I have extracted the following values from Draper and Smith (1998) for independent variable X, dependent variable Y for regression analysis: ...

• Replies: 2
• Views: 2,952
12-10-2016, 10:09 PM

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