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## Calculate Median Value for Real number

Beginner
2,619 Views

I wrote a program for the calculate the media value of real numbers. Program calculate the median value, but the calculated median value does not similar to excel or spss calculated median value. The excel gave median value 27.21 for the input data, but the program gave 29.45 for same input data. I also tried using integer or other data set the program also gave different median value from others.

Please give a solution How can I solve this issues. Many thanks for your support.

Labels (1)
• ### Fortran Language

1 Solution
Honored Contributor II
2,570 Views
``````   REAL, DIMENSION(0:100)			:: X
INTEGER                          :: N
INTEGER                          :: IOstatus
INTEGER                          :: i
OPEN(1,FILE ='DATA07.DAT', STATUS = 'OLD')
DO
READ(1,*,IOSTAT=IOstatus) N, (X(i), i = 1, N)``````

I was noting the array X start at x(0) through to x(100) , that is 101 elements but in your loop you have i = 1, n that is i does not start at zero.  Was that what you intended? X(0) is not set.

11 Replies
Valued Contributor III
2,608 Views
``````IF (MOD(N,2) == 0) THEN           ! compute the median
Median = (Temp(N/2) + Temp(N/2+1)) / 2.0
ELSE
Median = Temp(N/2+1)
END IF``````

At a guess and I do not do median -- these are wrong -- you are probably missing a bra and a ket as we say in Pure Math - could be wrong

Beginner
2,593 Views

@JohnNichols  Previously I used this format, then I changed it. But Both format output was given similar errors. Many thanks and looking further solution

New Contributor II
2,514 Views

Shouldn't the median value be an element of the set of values, unlike the average ?

You could choose either possibility when the count is even.

Honored Contributor I
2,476 Views

Not necessarily, the definition at Wikipedia, https://en.wikipedia.org/wiki/Median, includes the average of two numbers in the sequence, f you have an even amount of data.

Honored Contributor II
2,606 Views

I didn't study the program much but I noted that your array is zero based but all your loops look at elements 1 to N rather than 0 to n-1 is that your problem?

Beginner
2,592 Views

Honored Contributor III
2,586 Views

This looks to me like a class work assignment. If so, you should not be asking others to do your work for you.

Beginner
2,573 Views

@Steve_Lionel  Dear Steve,  this is not class work. I try to write a program for WQI model. That is a another part of my module.

Honored Contributor III
2,570 Views

Ok - the code you had and the problem reminded me of class assignments.

Honored Contributor II
2,571 Views
``````   REAL, DIMENSION(0:100)			:: X
INTEGER                          :: N
INTEGER                          :: IOstatus
INTEGER                          :: i
OPEN(1,FILE ='DATA07.DAT', STATUS = 'OLD')
DO
READ(1,*,IOSTAT=IOstatus) N, (X(i), i = 1, N)``````

I was noting the array X start at x(0) through to x(100) , that is 101 elements but in your loop you have i = 1, n that is i does not start at zero.  Was that what you intended? X(0) is not set.

Beginner
2,552 Views

@andrew_4619  Many thanks for your feedback. I solved this problem with array size correction.