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PROF. DR J. TINBERGEN

THE HAGUE, l6 February 1953
Sijzenlaan ^-1
Miss Ruth Skinner,
Editorial Secretary,
The Econometric Society,
The university of Chicago,
Chicago 37, (111.)
USA.

Dear Miss Skinner,
In reply to your letter of January 28,
I am giving my comments in this letter, sending back the
article by seamail.
My general impression of the paper is
favorable. I think the subject is important and
the approach interesting. I have only a few small questions
to put.
Page 3» Of course a hypothesis is Implied vihen the
author speaks about proportionality of
qualities. I wonder whether this is really
a necessary condition. Why not simply speaking
about ordinal qualities ?

Page 9»
quite
l i n e 5» I do not/understand what s o r t of s e t ^ Intends
to be.
Page lO.IIeither do I understand in^iy wages have been
transformed.
If these three remarks w i l l be
answered in the paper, I t might contribute to i t s understandability.
In my country an extensive l i t e r a t u r e
and numerical material on the subject d e a l t with escists;
I do not know what th« s i t u a t i o n In the USA i s , but I take
i t t h a t there must alr.o be a vast material ("job e v a l u a t i o n " ) .
I leave I t to an American expert to judge whether not some
references to t h i s l i t e r a t u r e should be made.
ï o u r s very s i n c e r e l y ,

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