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## Calculate Median Value for Real number

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 I
653 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 II
693 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
676 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
597 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. Valued Contributor III
559 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 I
689 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
675 Views Black Belt Retired Employee
669 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
656 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. Black Belt Retired Employee
653 Views

Ok - the code you had and the problem reminded me of class assignments. Honored Contributor I
654 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
635 Views

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