# Scott MacKenzie

### York University

**Statistics**

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Question

ranksum function is purportedly the same as the Mann-Whitney U test, but the results differ. Is there a reason why?

I've written a script to implement the Mann-Whitney U non-parametric test. As a guide, I used a data set (attached) and example...

14 hours ago | 0 answers | 0

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answersHow do you print the F-stat in a multcompare test?

@Darla Bonagura There is no F-statistic for post hoc pairwise comparisons tests such as Bonferonni, Scheffe, and so on. There i...

3 days ago | 0

Replacing Empty Cells by NaN

You can use fillmissing and specify the fill value for each column. Obviously, the fill values depend on the data type in the c...

1 month ago | 0

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Remove dimension from high dimensional array

Try this... M = rand(10, 8, 10, 8, 6, 7, 8, 9); whos M(:,:,:,:,2:end,:,:,:) = []; N = squeeze(M); whos

1 month ago | 0

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Repeat a cumulative sum in a matrix

Here's a way to do this without a loop: % test data (monthly returns for many investments for 252 months) M = rand(2784,252); ...

1 month ago | 1

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How can I change the interval on the y-axis?

Here's some example code on how to control the "ticks": x = 1:5; y = randi(100, 1, 5); plot(x,y); set(gca, 'ylim', [0 100]...

1 month ago | 0

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How to put the marker data over the curve fitting line?

You posted your reply comment as an answer. Oops. But, I see your point. And I'll try to explain here as an answer (although ...

1 month ago | 0

How can I transform these data into seasonal data?

Note: Code in comment moved here... load('DATI_MAR_mensili'); % NOTE: loads a table with 'Year' and 'Month' columns % add...

1 month ago | 0

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How to Calculate Area Between a Curve and Two Lines?

At the end of your code, add... x = D_Curve_PD_KPe; y = D_Curve_PD_KDe; cropLogical = x > 0; x = x(cropLogical); y = y(cr...

1 month ago | 0

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How can I store the value of variable 'dist_5thwheel_to_second_axle_sem2_itr' in array/vector format with every for loop iteration such that previous value stays as well? ?

You've got a bug in the setup of your loops. For the inner loop, change for i2 = 1:counter1 to for i2 = 1:counter2...

1 month ago | 0

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Function that checks for particular key press?

You seem to be using a custom toolbox that I don't have. However, assuming you can use built-in MATLAB functions, the tic and t...

1 month ago | 0

How to create column headers?

Something like this will work. I'm only showing the inner for-loop. fprintf('%6s%6s\n\n', 'x', 'y'); for n=1:length...

1 month ago | 1

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how to find area under curve for every 10msec?

Here's solution that shows the slope (derivative) and area (integral) sample-to-sample in the signal. The sample period is 10 m...

1 month ago | 0

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How to have a just specific part of a plot?

Follow the plot command with... axis([0 400 0 120]); axis off; set(gcf,'color','w'); Output:

1 month ago | 0

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Add legend to plot colored by colormap function

One approach is to do three scatters, one for each value in the 3rd column in your data. Here's the general idea using a modifi...

1 month ago | 0

How can I transform these data into seasonal data?

@Pul. Here's a solution that allows you to get summary statistics by season: load('testdata.mat'); % loads giulia_TT timetable...

1 month ago | 0

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How can I subtract the times without considering the date in question?

Here's one way to do this: % test data (one month in 30-min increments) dt = datetime(2021,4,1):minutes(30):datetime(2021,5,1)...

1 month ago | 0

How to plot multiple lines with gray color

Here's one way to do this: p=rand(12,5); figure (2) plot(p, 'color', [.5 .5 .5], 'linewidth', 1.5); % gray lines % put tex...

1 month ago | 0

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Convert final grade letter into categorical array.

% test data containing student letter grades C = { 'A' 'C' 'D' 'A' 'D' 'B' 'B' 'C' 'A' }; % define C to be categorical C = ...

1 month ago | 0

how can a make a loop for a double value in Matlab?

It's not clear what 19 variables you have in the table T1, but I suspect your error will disappear via... for i = 1:length(ID) ...

1 month ago | 0

How to detect negative number in Switch and case statement

Look carefully. Because you are switching on error, your first case expression reduces to error == (error < 0 && Uz > 0) ...

1 month ago | 0

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How to replace ones and zeros in a logical vector with vectors of corresponding length?

idx = [1 0 0 1 1 0 0]; % appearance of logical index a = [2 3 4]; % the values of a have to replace the ones in indx ...

1 month ago | 0

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How to convert an array of exponential numbers to am array of whole numbers?

Your question has nothing to do with "converting" numbers. Your question pertains to how numeric values are presented on the di...

1 month ago | 0

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Can I save different variables inside of a for loop?

Create the desired name of the file as a string or character variable, then use that variable with the save command. For exampl...

1 month ago | 0

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I want my graph to be continuous

You need to determine the point where the two functions intersect and then use that point in line 6 as the transition between th...

1 month ago | 0

Operator '==' is not supported for operands of type 'table'.

Try this: TurbineTest1=A(strcmp(A.SAPID,u(1,1)),:);

2 months ago | 1

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Create a timetable for every minute in one day

Here you go. As seen in the output from whos, there are 1441 rows in the timetable, one for each minute in the day plus the fir...

2 months ago | 0

Plotting two Spherical helix on top of each other with one being 90 deg shifted rotated about the z axis

For a before-and-after comparision, substitute the following for the plot3 line in your code. The z-axis rotation isn't particu...

2 months ago | 0

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Could anyone help me how to calculate the mean of cell array

I'm guessing either m1 or m2 below is what you are looking for. c = { [1 2]; [1 2]; [1 2]; [1 2]; [1 2]; [1 2]; [1 2]; [1 2]; [...

2 months ago | 0

replace specific commas using strrep

In stages, to show the possibilities... s1 = '[[0, 145, 0], [145, 169, 1], [169, 1693, 3], [1693, 1708, 1], [1708, 2729, 3], [2...

2 months ago | 0

| accepted