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art297
Opal | Level 21

Show some sample data with all the calculations in Excel and I'm sure that one of us on the forum can figure out what the difference is.

Costasg
Calcite | Level 5

I am attaching  a sample file. I did the calculations for the first months.

Many thanks

art297
Opal | Level 21

Yes, there were definitely some things that had to be changed in order to match the results.  I think that the following calculates exactly what you were doing in Excel.  The main differences from what I had originally proposed are: (1) using the log10 function rather than the log function; (2) multiplying the differences by 100; and (3) using the corrected rather than the uncorrected sums of squares.

data need;

  set have;

  array vars(*) a1--a100;

  array diff(100);

  yrmon=put(DATE,yymmd.);

  do i=1 to dim(vars);

    diff(i)=(log10(vars(i))-log10(lag(vars(i))))*100;

  end;

run;

proc means data=need mean uss nway noprint;

  var diff1--diff100;

  class yrmon;

  output out=want (drop=_:)

   mean= css= /autoname;

run;

data want;

  set want;

  array diffs(*) diff1_CSS--diff100_CSS;

  do i=1 to dim(diffs);

    if diffs(i) gt 0 then

    diffs(i)=diffs(i)**0.5;

  end;

run;

Costasg
Calcite | Level 5

I don't have words to thank you for your help and time. I will check it in a few days that I will return to the uni but I am sure it is correct.

Many thanks again

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