For my thesis i'm having some trouble with interpreting a significant interaction effect while the simple effects are both insignificant.

I already checked related fora but in most cases the solution is, that it's a cross over interaction but i already checked this on my data and this is not the case.

I have a significant interaction between variable A (two levels) and variable B (two levels) on Y.

This would indicate the effect of A on Y differs by B, however the effect of A with...

Significant interaction effects but no significant simple effects]]>

New here, thanks!

Wanted to ask about finding out my percentile in a class (law school). Our school gives out various bins for grades, e.g. 0-50, 50-55, 55-60, 60-64, 64-68,68-72, 72-76, 76-78, 78-80, 80-85, 85-90, 90-100 and tells us how many students fall in each bin, and what percentage of students that is. So, if you got a 76, it would be really easy to know your percentile (just add the total number of students who did as good or better than you divided by total students...

Calculate class normal curve in unequal bins?]]>

I would like to learn how to construct a line graph on SPSS with a few variables on the Y axis.

I could not find the solution online. I don't even think it's doable. Is it?

Thanks.]]>

i am having trouble making a model for this data

we have a categorical treatment with 4 levels with 3 other blocking terms.

scrat.glm<-glm(scrat$Scratching~treatment + Day + Pig + Shed + Pen, family= quasipoisson, data= scrat)

this is the model i was trying to make but it doesnt seem to be right.

i dont know what to do im new to stats ]]>

Essentially what I would like to do is determine how the various features of a unit effect the rental rate per sq. ft...

Value of Features and Attributes to Statistically Estimate Rental Unit Pricing]]>

I have a gold standard test that I would like to compare to a new test.

This new test will be assessed as categorical binary outcome (positive or negative) by 2 observers.

I can compare reliability of the two observers with kappa. That's easy.

How should I compare my gold standard to the findings of the 2 observers? Do I set up a 2x2 table for only values in which the observers agreed? How can I compare my standard to the new test in which the...

Help with inter-observer agreement]]>

Did a search in the forum but couldn't find a thread that has the same issue as me. I found similar issues, but not the same.

I have a dataset where users were able to choose more than one option when answering certain questions. In this dataset, the column that contains the answers has them all grouped in a single field, and each selected item is separated by colons. For example, let's assume the question is "which fruits do you like" and options are "bananas", "apples"...

SPSS - Transforming data for multiple response questions]]>

I am conducting a series of ordinal regression analyses using SPSS Version 25 as I have done many times in the past. I am coming up with an error every time with the same variable and I can't work out what the problem is. If anyone could offer some advice that would be very much appreciated!

I have ran several ordinal logistic regressions with proportional odds with the same independent variables and different dependent variables. All assumptions have been met and there has been no...

Missing Results in Ordinal Regression]]>

Even if only one variable is selected, or in the "Numeric Variable-->Output Variable" field of "Recode into Different Variables", all new values for both variables appear in the "Old-->New" field.

Is this a valid concern? Is there a way to be assured that...

Transforming Data - New Values for Multiple Variables]]>

I don't know if there is any post already regarding this and, if there is, I am sorry for reposting.

I was asked to explain a table from an ANCOVA , specifically the values of F, etc. The table in question is Table 1.

Can anyone help?

A.]]>

I have done the following code

install.packages("mlogit")

install.packages("nlme")

library("mlogit")

library("nlme")

data("HC", package="mlogit")

HC1 <- mlogit.data(HC, varying = c(2:8, 10:16), choice = "depvar", shape = "wide")

cooling.modes <- index(HC1)$alt %in% c('gcc', 'ecc', 'erc', 'hpc')

room.modes <- index(HC1)$alt %in% c('erc', 'er')

HC1$icca[!cooling.modes] <- 0...

Estimate the restricted Nested Logit]]>

I am new here, so not sure that this is the best place to ask the question or not. Here I go anyways.

As show below, I have a dataset in which the parts made in Tool1and from each run( runs_Tool1- nominal values) goes through Tool2 and runs - nominal value. After going through Tool 2, the parts are measured.

Each run from Tool1 has major impact on the measured data. What is the best way to standardize the data so that I am only looking at the variations from Tool2?

Regards

Will...

Best way to analyse the data]]>

I have my SPSS dataset for my research all set and ready to analyse.

I want to perform a chi-squared test to look at the relationship between 2 categorical variables.

e.g. relationship between headache and different outcomes (4 subcategories? i.e. benign, progressive, disability, death)

I have tried to do this via crosstabs/chi-squared test on SPSS and I do get a significance of p<0.05 which is reassuring however is there any way I can find which category in the different...

Performing Chi-squared tests for 2 categorical variables (the dependent variable has 4 categories) and looking at statistical difference?]]>

- A doctor is studying the relationship between blood pressure and heart beating abnormalities in her patients. She tests a random sample of her patients and notes their blood pressures (Low , Normal , High) and their heartbeats (regular or irregular). She finds that 14% have high blood pressure , 22% have low blood pressure , 15% have an irregular heartbeat. Of those with an irregular heartbeat (one - third) have high blood pressure and of those with normal blood pressure (one -...

Probability Problem]]>

How do I generate a standard uniform...

Generating a uniform function from an exponential function]]>

Can someone tell me why RMSE is equivalent to this formular (Or have i misunderstood something?):

sqrt[(1-R^2)]*[SD(y)]

R^2 is the coefficient of determination and SD(y) is the standart deviation of y.

As stated in this article:

https://www.statisticshowto.datasciencecentral.com/rmse/]]>

Hint: Is the sample average different from the population average? If yes, how different based on statistical significance? Please note that sample size > 100

Type in the p-value of your hypothesis here, rounded to two decimals (0.xx)

Avg Revenue per transaction - Pop: 614

Avg Revenue per transaction - Sample...

Help Required!]]>

I am collecting the details of family members , and the education details of my research participants in the format below. How do I enter this data into SPSS?

Family constellation:

Education details:

]]>

I am struggling wih the following:

I'd like to analyze the impact of several categorical independent variables (one of them having 4 categories) and one interval IV (total score on a scale) on an interval dependent variable. Basically I would like to see the (respective) impact of all IV and test if they're significant.

I have tried lineair regression but then realized that this isn't possible because of the 1 categorical cariable with 4 categories. Making dummies also...

Which analysis for 1 interval DV & a mix of several categorical and one interval IV?]]>

I'm carrying out a research which tries to analyse factors affecting coffee consumption behavior, there are 7 independent variables on hand and 1 dependent variable which is coffee consumption behavior

The data is collected using survey form, handed to 267 respondents (coffee consumers), the 7 given variables as can be seen in the image bellow are placed in the survey form in 7 sections, each section having their own 3-4 statement with 1-5 degree of agreement levels.

It should...

Which test should be used with 1 dependent variable and 7 independent variables?]]>

Q26: Do the respondents agree more with “I have been making an effort to look for fast-food choices that have better nutritional value than the...

Need help selecting appropriate tests for assignment]]>

Univariate analysis shows a relationship between a demographic characteristic (work department) and the outcome variable.

However, only 3 of the 13 predictor variables are...

Identifying potential confounders]]>

I'm looking at count date and I want to be able to plot when each 'thing' (my example is colour, but not in real life) by date and time - so that I can visually see when each 'thing' happens most. Normally I'd just average it, but I suspect there may be multiple peaks within each day.

I could manage if I still had access to GraphPad, but I'm stuck with just excel.

Thanks in advance!!]]>

I'm working on a problem where I have 30% of a full dataset and I have to estimate the generalization error.

To be more precise, let's say I have the information of the transactions of the clients of a bank which has 30% of the countries market.

I can easily get the mean, standard deviation and so on of my dataset but I can't figure out how to extrapolate.

I know all about basic statistics and so I went through all my lectures to try to find the answer.

I would like to calculate...

Extrapolation - Getting info of a population from a sample]]>

This question relates to the weight of leaves on a sample of 90 trees measured prior cattle browsing, and the weight of leaves on a sample of 87 different trees taken post browsing.

Prior to browsing: 141.7 g of leaves <160 cm, 155.4 g of leaves >160 cm, (total leaves 297.1 g), sample...

Sample size in proportional tests (prop.test/other suggestions that can include sample size)?]]>

Does someone know which test i need to use to compare the means (multiple) of two groups when there is a research where there are 2 groups undergoing 2 interventions, since it's a crossover desgin, every particpant will do both of the interventions. The means that need to be compared are mutiple bloodmarkers.

Thanks]]>

I am running a multiple linear OLS regression on a DV with the following frequency distribution. The DV is the mean of 5 Likert-scale items (thus, pseudo-metric as common in social sciences).

I know that the DV does not have to be normally distributed in multiple linear OLS regression but that the residuals should be normally distributed. I checked for the normality of residuals and everything seems fine from this perspective (PP and QQ plot looks fine, Shapiro-Wilk Test for the...

Distribution of DV in multiple OLS regression]]>

How can I take their answering behaviour into consideration when reporting overall and detailed country results? Method should be fair and not manipulating any data.

Data collected is on 7 point scale with 7 being strongly agree, 1 being strongly disagree.

Should I do...

Fixing different demographics behaviour on survey data]]>

How can I take their answering behaviour into consideration when reporting overall and detailed country results? Method should be fair and not manipulating any data.

Data collected is on 7 point scale with 7 being strongly agree, 1 being strongly disagree.

Should I do...

Fixing demographics behaviour]]>

I am by no means an expert on stats, and currently I am enrolled online in a stats course and in need of help (that the professor sadly doesn’t really offer, unless help is a condescending remark).

Basically, I am working on a stats project about fatal car accidents. I have stats on total # of accidents by year, total # of alcohol-related accidents, and a breakdown of male a female per year. My project is to help influence a business decision, and I have chosen to take the...

In Need of Assistance!]]>

How can I take their answering behaviour into consideration when reporting overall and detailed country results? Method should be fair and not manipulating any data.

Data collected is on 7 point scale with 7 being strongly agree, 1 being strongly disagree.

Should I do...

Fixing behavioural difference of demographics]]>

I recently did some statistical analyses on cattle trials, and was considerably helped by this forum. I used non parametric testing for non normal data. However, my supervisor says (as a rule) it's better to transform data and use 'more common' parametric tests (such as glm) than use non parametric tests?

I've attached what I sent my supervisor, and I hoped some of you people could take a side. Have I made a mistake? And if I...

RESOLVED but still open for discussion: When to transform and when to use non-parametric tests?]]>

Method used so far is finding correlation between the questions.

Any other statistical method for deep analysis that I can look into?]]>

I am currently doing a study and as part of it, I have to develop a questionnaire with the following structure: Given a change in "Factor A" how will it affect "Factor B"?. I have realized that I have many factors (and therefore my questionnaire is quite long). Then, I would like to perform a statistical analysis to check if some of these factors are independent so I can eliminate some questions, and therefore reduce the questionnaire's size. For instance, if after an...

How to choose the best statistical analysis]]>

I am trying to run normality test for 3 variables and I am just getting p value for one of them.

Has someone faced this problem before?

Thank you for the help!]]>

I'm trying to understand whats the optimal selling price for Quantity sold and Revenue.]]>

I attempted to use an F-stat to test this with model 3 being the unrestricted and model 2 being restricted but came up with a negative F -stat. To my understanding F-stats can not be negative. Re-reading the textbook, I think i was supposed to use a T-statistic for the question. In class I have only worked on problems where the...

Correct Interpretation of data set?]]>

Any suggestions?]]>

So I found data on the FSIS website on meat recall in years 2005-2009. I want to do a study based on the data and figure out what meat was recalled the most and why.

Out of these three types of study, which one would you say it falls under. Survey? Experimental? or Observational?

Thanks]]>

I am looking for some help with doing the statistics for my master thesis. Unfortunately I had only basic introduction to statistics and need help at this point. My research is about checking if there is a difference in heating a specific material with ultrasound wave when starting with different initial temperature. I have results of 180 sec of heating for 5 different initial temperatures. 9 heating curves (sampling 1s) for every initial...

Science research, checking the significance of difference - which test]]>

I'm carrying out a research which tries to analyse factors affecting coffee consumption behavior, there are 7 independent variables on hand and 1 dependent variable which is coffee consumption behavior

Is Multiple regression analysis can be used while there is relation among independent variables as well? If not what other tests can I use?, if yes also what other additional tests can be used? your help will be much appreciated

The following are 7 hypothesis as well as the...

Which test should be used with 1 dependent variable and 7 independent variables?]]>

I am working on building a Predictive Model using the binary logistic regression and LASSO logistic regression. In order to apply these models on some real data set I am using R software.

Before performing such a model I am testing for multicollinearity and will remove any highly correlated variables. In order to check if I have multicollinearity I will be looking at the VIF and Condition Index, then I will apply "spearman" correlation to remove any highly...

Test for Multicollinearity]]>

I don't see any obvious heteroskedasticty....although lots of outliers.

Not fully normal, although I think its close enough. We have some extreme income which is why the outliers occur. They could be mistakes, but we have no way to...

Comments on residuals]]>

One of the published paper which we are referencing is using cox proportional model to report hazard ratio. I...

Logistic regression vs. cox proportional hazards model-which model to choose?]]>

I'm being troubled, and failed to figured out what might be wrong with my data. I'm trying to analyse ranking data, of non-Timber Forest products. The order is most preferred to least preferred and are 8 in number. Now after analysed this data with nonparametric using SPSS. I got warning that reads, no enough cases for processing. Please help]]>

What is the best test to analyze these data points. I am using minitab. Thanks!]]>