Questions tagged [minitab]

Commercial statistical package distributed by Minitab Inc.

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14 views

Mixed effects/nested model giving different EMS tables in R and Minitab, and I believe Minitab is incorrect. Anyone know why it would be wrong?

I have a dataset at https://docs.google.com/spreadsheets/d/1PB_S7oX2Tqgz_BEUUcHfLOww0cNJ-IgN6B34UTequlw/edit?usp=sharing that shows a mixed model where Machine and Station are fixed effects and Power ...
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1answer
28 views

Why is error contribution higher than factor contribution in ANOVA?

I used Taguchi L9 orthogonal array design for my experiment to optimise the tool geometry parameters for better surface roughness. I have conducted experiments as per DOE and I used Minitab to find ...
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23 views

Most suitable stat test for this data?

Looking for a difference between: count and size, exposure, animal and colour (CountXsizeXexposureXanimalXcolour). There are 480 data in each column of which: 240 each - size (0.5mm and 2mm) 240 ...
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1answer
154 views

Normality test for discrete values of a continuous variable

I have a dataset with several hundred pH measurements from a factory line. This dataset will be used to infer process capability using Minitab. On a physical basis, pH is a continuous scale (being ...
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1answer
50 views

I want to compare a forecast with actual inventory, what statistical tests can I use?

I have two datasets, both are .csv files: Forecast- Marketing team's forecast of inventory levels that would be required in 2019 Inventory - Factory's records of actual inventory values recorded in ...
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1answer
20 views

Determining probability from categorical variable data

Whist reviewing some test data I am looking for advice on identifying the correct statistical tool(s) to help me answer two questions. The data I am looking at is from a cytotoxicity test, whereby a ...
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17 views

How can I group my factors for post-hoc test in Minitab?

I've recently been using R for my data analysis, but was struggling so I've turned to Minitab for the first time. The data I'm using can be seen here - Is it possible to do a post-hoc test on a ...
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66 views

Different PLS model when using plsr() function in R or Minitab PLS regression menu

I have a PLS model made in R with plsr() function (from package pls); I have chosen the right number of components with cross ...
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1answer
22 views

Independent Variables in Multiple Regression found Significant, but Insignificant when ran Individually

I've ran into (by accident) something that has stopped me in my tracks. When running this analysis: I get that Use, FA, and Detections are significant predictors for fixation duration on map duration....
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2answers
45 views

Split plot design with psudo replicates

I am working on a project and need to analyze data that I know is an example of a split plot design but I am having trouble setting the model up correctly. Here's the situation: A bakery is testing ...
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10 views

Operator Variability

I'm currently running a Gage analysis on some spectral measurement data. To assess the measuring system I'm using Minitab 16 to perform a crossed Gage study on the data. The study was done using 3 ...
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41 views

Minitab / Survival Analysis / Multiply Right Censor

I am doing an analysis to see if investments in leadership training have decreased attrition. The data I have is: Employee Start Date Hire Quarter Term Date (if not still employed) Status (Active ...
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1answer
35 views

Understanding formula for Short Term / Long Term Degrees of freedom in minitab

Now I'm new to statistics, but the last time I did degrees of freedom, the formula I used was $df = n-1,$ but I've just been playing with Minitab and reading the help to files, and I noticed it is ...
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1answer
121 views

One tailed paired t-test

Ok, this might be an obvious question but it's had me stumped. Let's say we're doing a test to see the improvement on test scores before and after some process. We could state the hypothesis as: H0:...
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1answer
60 views

Testing beta is 1 with Minitab or SPSS [duplicate]

I would like to run a regression to test a hypothesis that alpha = 0 and Beta = 1. I understand minitab or SPSS regression will test whether alpha or beta is 0. How do I test whether beta is equal ...
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187 views

ARIMA R vs Minitab [closed]

A simple question: Is the algorithm for calculating the fits using the Arima function of the forecast package of R different ...
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1answer
119 views

What is the number of iterations used to estimate the ARMA coefficient

If we are using the LSE "least square error" equation for getting the AR and MA terms: by getting the LSE in function of the coefficients and differencing it then equating it to zero.This yields ...
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2answers
612 views

extreme right skewed data, bootstrap or mann-whitney?

I am an old dog (DB guy) trying to learn new tricks (stats) and was hoping someone here could tell me if this is a good approach: I have to analyse extremely right skewed counts of events over a ...
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62 views

Do general linear models actually fit a linear function to the data?

If I understand correctly, linear regression involves fitting a linear function to a dataset and computing the error in that function. There's also a notion of "general linear model" which seems to be ...
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1answer
483 views

Why these the results in factorial 2k experiment analysis with R are different of the Minitab?

I'm studying DoE $2^{k-p}$ and I'm attempting to replicate an experiment using R software from a article that was run in Minitab, but the results are different. Regression model presented in the ...
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55 views

Identify the underlying distribution from multiple samples

I have $30$ unequal samples ($n_i >1000$) from a supposedly same population. How should I go about identifying the underlying distribution of the population using these $30$ samples simultaneously? ...
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1answer
61 views

A proper function for nonlinear regression with 3 predictors

There are three independent variables in my experimental work, namely flow rate (0.5 ≤ Q ≤ 9 where ΔQ = 0.5), particle size (a = {6, 10, 15}), and a geometric parameter (AR = {AR1, AR2, AR3, AR4}). ...
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1answer
20 views

Statistical analysis of bud burst - handling a whole group of 0s with a mean of 0?

I have two treatments A and B which have been applied to tree buds to see if they will burst in a set time period. The outcome is binary - burst or not burst (yes or no, 1 or 0). There are an uneven ...
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2answers
728 views

regression equation of factorial design [closed]

I was wondering why I get a different kind of regression equation when I do the same data in a different way(create DOE in the minitab vs type the data myself ). For example, when I do the job as the ...
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1answer
589 views

Check for equal slopes with Chi-Squared test

I have the following distribution of counts where blue represents blue shoes, red represents red shoes and green represents green shoes. Though the total sales numbers differ I want to check if the ...
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2answers
67 views

Choosing alternate hypothesis in two sample t-test

I am trying to do two-sample T-test in Minitab where I have to compare average of one variable with another binary variable. I am having difficulty in choosing alternate hypothesis. So just for ...
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53 views

How do I assign a probability distribution to all combinations (4500+) of a single variable?

I'm trying to simulate the delivery times for a fast food restaurant (i.e. the time it takes the delivery guy to reach the client from the restaurant). The locations of all clients are put in ...
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30 views

Design of Experiments on Minitab output

I am trying to create a factorial design using Minitab. I have 2^4=16 runs, I would like to divide these up into 4 blocks, to spread the experiment across 4 days. I will have 4 judges to complete ...
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423 views

Confidence interval for Mann-Whitney test (Hodges–Lehmann estimator)

Does anybody knows how to calculate the confidence interval using normal approximation for the Hodges-Lehmann estimator (median of Y-X)? This is how Minitab performs calculation, but I cannot find ...
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2answers
1k views

Time series-Minitab-fixing Autocorrelation problem using first difference

I am studying time series. I have the following data: The Model for this Data is given by: $Revenue= \beta_0+\beta_1{X_{1t}}+\beta_2({X_{S1,t}})+\beta_3({X_{S2,t}}) + \beta_4({X_{S3,t1t}})$ or ...
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1answer
50 views

How do I compare the co-efficients of two binary logistic regression models?

I have data on Liver Disease Patients, with the response variable being whether the patient has liver disease or not(1 or 0) and 7 predictor variables, such as age, gender, protein levels etc. Now, ...
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1k views

How to calculate standard error of means in minitab

I am going through the 2 way anova steps provided by minitab. But I just can't get the answer for SE Mean as shown in this website (http://support.minitab.com/en-us/minitab-express/1/help-and-how-to/...
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278 views

Fourier Transform-Time stamped data and Linear Regression

I am new to DFT (Discrete Fourier Transform), but I am trying to use it to decompose my traffic volume data into two vectors (x,y i.e. independent and dependent variables). Afterwards I can apply a ...
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1answer
530 views

GLM in R and Minitab gives very different results when interaction included

I run a GLM in what I believe is the same way in Minitab and R. With no interaction term, I get identical results. With the interaction, the results are completely different. I'd much appreciate any ...
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1answer
1k views

How to conduct a capability analysis (by calculating cpk) and check results using Minitab. Six Sigma, DMAIC etc

as the title states I'm conducting a statistical analysis for the variation within a machine (a laser marker). Just as a little background info, I have started off by conducting a GR&R for the ...
2
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1answer
70 views

Variance Ratio Test in Minitab

I have two samples, each of size 18 observations. In the first, the SD is 10 and in the second it is 3. I wish to test the hypothesis that the variance ratio is 4, vs. the alternative that it is not 4,...
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1answer
237 views

Mann-Whitney test W statistics

Below is Mann-Whitney test result from Minitab. At the end of result, there is no p-value but "Cannot reject since W is < 363.0". What does it mean? I cannot ...
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1answer
569 views

MSE in GLM ANOVA

Experimental Design: Whole plot: Tree species (Spp) Subplot: Location relative to canopy boundary (In/Out) Tests: 2-way ANOVA on data collected for several tree species from a transect running ...
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1k views

Principal Components Analysis Regression VIF Interpretation in Minitab?

I'm trying to verify my understanding of how to apply principal component analysis to a multiple regression. Here's my current process and understanding using Minitab: Part 1: I already have my data ...
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1answer
166 views

Can not determine the ARIMA model for data [closed]

I am trying to develop a useful statistical time series model (ARIMA) using auto arima. The program reported that it can not determine the model. Please help me understand the limitations (if any) of ...
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1answer
84 views

Minitab question about binomial probabilities [closed]

What I have tried: My first instinct was to go to Calc>Binomial distributions> Binomial to get the graph of it. 2 questions: What does the question mean it needs values less than 21? Should the ...
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0answers
314 views

How To Calculate and Print CDF and Lower Bound CDF value for some t (time) with Minitab (without examining the plot)

I'm a reliability engineer. Cumulative Distribution Function (CDF) in statistics stands for the unreliability (probability of failure at a time value) of the item being tested. Unreliability is very ...
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1answer
91 views

Making forecasts in minitab only positive

I'm looking at 30 years of rainfall data, working with the daily average rainfall per month (That sounds weird... it's the total rainfall in the month, divided by number of days in the month). Anyway,...
2
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1answer
2k views

repeated measures anova using minitab

I have to analyze repeated measures data set where each subject’s BMI is measured at several time points. I have two sets of subjects where some were given drug1 and another group of subjects is given ...
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0answers
1k views

Interpretation of residual plots — constant variance of residuals

I am trying to analyze these residual plots. Clearly, from the normal probability plot and histogram the standardized residuals are not normally distributed (it shows a moderate negative skew). ...
3
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1answer
2k views

How do I test the stationarity of data using minitab? [closed]

I am working on a time series and trying to fit ARIMA to predict future values.However, I am facing trouble with finding out whether the data is stationary or not.
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1answer
436 views

bonferroni and scheffé' simultaneous confidence interval graph in minitab

I need to calculate bonferroni and scheffé' simultaneous confidence interval by hand as a homework. However, I also want to add minitab outputs and graphs to my homework task. How can I plot these ...
4
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1answer
17k views

how to determine skewness from histogram with outliers?

I have the following histogram created in Minitab. I am wondering whether this histogram is actually positively skewed, negatively skewed, or symmetric. By observing the graph itself, it seems that ...
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0answers
273 views

Is my nested random-effect model non-hierarchical?

I have a problem with model structure because of the way factors are nested in a potentially non-hierarchical way. I'm not sure if I fully understand the issue but I can't find a way to specify the ...
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1answer
594 views

Probability of Event in Logistic Regression

I've a binary response (1 = event happen, 0 = otherwise) and 8 continuous predictors plus 1 categorical. Fitting in Minitab with a Binary Logistic Regression give me this output: ...