minitab

  1. A

    My data does not follow a normal distribution, but Mann Whitney U test gives me a p-value of 0.935?

    As the question indicates, I conducted a normality test on Minitab, and the p-value I received was 0.018, which is less than the significance level, therefore, it is not normally distributed. Therefore, I had to conduct a non-parametric Mann Whitney U test, and the p-value is 0.935, which...
  2. J

    Subset regression error?!

    So I have 11 predictors and one response variable. I am wanting to look at the relationship (see what predictors effect the variable) and as I can't put all my predictors into multiple regression, I thought subsets would be best. Unfortunately when i enter all my data it comes up with the...
  3. Y

    Definitive Screening Problem

    Background: I'm studying a complicated welding process where I have 12 continuous factors and 1 categorical factor that interact to produce a dense weld ( the good part). To determine whether a part is good or not the density of samples is determined using the Archimedes technique. I used...
  4. B

    Scheffe test in Minitab it's possible? How?

    Hi members Why the Minitab program does not present the Scheffé test (of multiple comparisons of means) after the ANOVA test ... I have made a RM ANOVA and post it was looking for Scheffe test .... Surprise! It's not possible! Why? TIA Ivan
  5. M

    Regression R2-value Vs spearman correlation coefficient

    Greetings I have been assessing some of the relationships between EDTA extractable Pb Vs Pb in plants etc using regression analysis in minitab. I just found a study that did a correlation analysis instead providing the correlation coefficient and p-value in order to assess if the relationship...
  6. M

    P-value - Parametric Vs Non-parametric

    Greetings Is it possible to compare the p-values derived from non-parametric tests to parametric tests? For example, lets say dataset 1: Copper concentration in spoil is not normally distributed, so I have to use a non-parametric test on it and get a p-value. Dataset 2: copper concentration...
  7. M

    Post Hoc analysis for non-parametric analysis in Minitab: HELP

    Greetings I wish to be able to use post hoc analysis on my non-parametric analysis on my data. I am currently using Krustal Wallis (as I have 5 sets of data that I wish to compare). As this will only give me a p-value and a z-value which informs me if the data is significantly different or...
  8. H

    Hypothesis testing and minitab

    Hi New to the site - I've managed 11 out of 13 questions for my final set of Master Black Belt homework but now stuck! Can anyone offer an explanation to this question and how it could be answered in minitab? I've had a very extensive look online and found multiple solutions but cannot work...
  9. B

    Help with measurement system analysis with destructive samples

    Hello everyone, I am an internship student and for my company I have to develop a method to test if their material is brittle or not. They bought a new machine so first I have to start with an MSA (measurement system analysis). I would like to test the repeatability and reproducibility...
  10. M

    Before/After- t-test???

    Hello everyone, Kinda new to this forum. I need help in finishing off this project. So, my research question is whether an increase in the blood alcohol content (i.e., drinking alcohol) lead to a decrease in the mental capacity of performing basic tasks. In order to perform this research (and...
  11. S

    Anova

    I am trying to find the effects of feed rate, cutting speed and depth of cut on surface roughness. I have five sets of feed rate ( 0.09, 0.10, 0.125, 0.150. 0.175), four sets of speed (41, 53, 66, 82) and two sets of depth of cut (0.5 mm and 1 mm). Like: 0.09-41-0.5 = 3.65 0.09-53-0.5 =...
  12. E

    MSE in GLM ANOVA

    Sorry for the wall of text, but I'm trying to figure out how to proceed and feel as though I need to clue you in as best I can. Experimental Design: Whole plot: Tree species (Spp) Subplot: Location relative to canopy boundary (In/Out) Tests: 2-way ANOVA on data collected for several...
  13. C

    F- Value to T- value in an ANOVA test

    So i did a minitab ANOVA test, it spat out a F-Value. A question in an assignment needs me to give them a t-statistic. Can i use this F-value as the t-statistic? Or do i need to do some sort of calculation to get the T-statistic. Sorry if this is a dumb question, ive looked online for...
  14. A

    Regression problem: How we can Ignore Outliers in a regression analyses??

    [Minitab 16]Regression problem: How we can Ignore Outliers in a regression analyses?? Hello I want to draw a simple linear regression chart in Minitab and I want to find The regression equation. I use two column of data and this path: Stat>>Regression>>Regression... Minitab shows me...
  15. K

    How to determine significant diff or not btwn slope and intercept of two datasets?

    Hi, this is for some research I'm doing in a lab, and I cannot for the life of me figure out how to determine if the two regression lines' slopes and intercepts are significantly different or not (I'm hoping they aren't!). From looking at the graph below, it seems obvious that they should not be...
  16. K

    Scatterplot relationship issue.

    Hi, the data below is just a sample of the data I am trying to enter into a scatterplot. The issue is that a previous correlation test shows a p value of 0.011, a clear relationship. However, when I took the averages of 196 entries of the data below, the scatterplot shows little...
  17. T

    Senslope as a percentage

    Hi, I found a way to express the nonparametric senslope (which is a median slope joining all pairs of observations) by dividing the senslope by the same data mean value. I have done this for all observations (For example: number of injuries observed per quarter over 6 years). My question...
  18. B

    Is there any effect if i change the column value in Minitab Taguchi DOE design??

    Hello all, I am trying to design Design of Experiment using Minitab statistical software using Taguchi approach. I have 3 level and four factors. When I go Minitab-->stat-->DOE-->Taguchi-->3level design with 4 factors i.e L27 (3**4) there will appear factors, name, level values, column, and...
  19. S

    Ranking/sorting of variables after 'ordinance regression'

    I have run regression and came up with 5 out of the 9 varibles are having an impacat on the final output (0,1,2). I want to see the order in which they have impact. example: variable 1 is the most important and variable 3 is 2nd and variable 5 is 3rd and so on. How should I accomplish this/...
  20. D

    Help with Minitab Taguchi aplication

    Hello, I have a question about using minitab DOE Taguchi design aplication. When I have a three factor theree level (L9) Taguchi design and apply Minitab for the analysis I have a problem to understand the results of analysis for the coefficients Term Coef SE Coef T P...