Wes

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0 years, 125 days

MaplePrimes Activity


These are questions asked by Wes

Hello,

I need to work with the shapiro-wilks statistical test for the normaility of the population.

I remark that the precision of this test with Maple is not very good.

I try the same test with STATISTICA, STHDA and  XLSTAT. 

For p-value, I obtained 0.3478, 0.3439 and 0.348 with the 3 others softs and 0.4146 with Maple.

For the W, I obtained 0.986, 0.9825 and 0.983 with the 3 others and 0.9761 with Maple.

My sample has 80 elements, risk 0,05.

Is there anybody to explain this difference between the results and perhaps to confirm if it does exist a best method with Maple.

The test : 

pvalue2 := Statistics:-ShapiroWilkWTest(Mat2, level = 0.05, output = 'pvalue')
statvalue2 := Statistics:-ShapiroWilkWTest(Mat2, level = 0.05, output = 'statistic')

Thank you very much for help.

Hello,

I have a problem with the type of the pvalue in the Shapiro-Wilks test.

My program :

pv := ShapiroWilkWTest(Mat1, level = 0.05);
whattype(pv);  list  
eval(pv[2]);  "pvalue = 0.25..."  This result is an element of a list but not a real number

I would like to obtain the real value of pvalue in order to make a calulous with it.

I have tried as an example in Maple :

pv := ShapiroWilkWTest(Mat1, level = 0.05,output=pvalue); but it doesn't run.

May someone help me? Thank you very much
 

Hello,

I have a problem to export datas in an excel file.

I have no problem to read some datas in this file, but when i want to write a matrix 1x1 in a cell, there is no error message but nothing happen in the file.

Here is my program :

with(ExcelTools);

kernelopts(datadir);

File1 := FileTools:-JoinPath(["Excel", "test.xlsx"], base = datadir);
Mat1 := Import(File1, "Somme", "G2:G8"); # it runs very well
R := array(1 .. 1, 1 .. 1, [[564]]);
Export(R, "test.xlsx", "Somme", "G1"); # nothing happens in the file

Thank you very much for help

Hello,

I don't understand. With 2 degrees of liberty and a factor of 5% (1-95%), the table Khi-2 indicates 5,99.

It is impossible for me to obtain this value with Mapple. 2 following tests :

Y := ChiSquareRandomVariable(2);
                            Y := _R0

PDF(Y, 0.05);
CDF(Y, 0.05);
                          0.4876549560

                       0.0246900878919645

PDF(Y, 0.95);
CDF(Y, 0.95);
                          0.3109425282

                       0.378114901350325

The same problème with the instruction RandomVariable(ChiSquare(v)).

Thank you to help me.

Kinds regards

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