extracted text

<4'. f.
.>ear iAC-.^vittredge,
ia aa gxaa bo give yov '-'—. following
particulars as to i;5r»f)erk3©n*s cp.T)?5,citiQs
ork»
.i>urin«: «ne ijise B Q iftaa ï^reparxii^ ais u^.;.
^ii^sis ?md
afterward©., as m-y first collaborator in the c
,i .^te.viutical
Off ice f I^«i)erköen proved to "be a well-trained mathematical
statistician and a careful official, fully awar© of his responsa«felllties and duties* Hecently, while revising and iriproving the
Dtttch production index, he showed ©uch independency of jud^ent
and constructive originality in the treatment of thesj© probleKS,
He coffildned, in a very able way, all the information available
and ax rived at a number of well-founded estimates for items
*hlch hither to had been left out of acoo\mt«
In many discussions on what we call "the system of
relation» aescribing the •:utch business cycle mechanism" Ï
found that Dr.Dei'ksen i-^idicated various valuable improvefflents
as a consequence of thorou^ reflection on the sense and
implications of the hypotheses underlying that syateia.
His booklet on correlation calculus has met with much
approval of t
as well as of the readersj and his
study on the
.,..- -...„• beer and spirits had s sr®^* success,
?ve had to reprint the issue of our raview in v?hich It appeared,
'yr-,'-^i^tkBen is, and will b© after bis return, in chsr(r«
of li^
rig the statistics of national income in the
Ne
Stat:
i are very " "
' now
• is
cfc-i-K......
......,...-., Qvm. -,...-^.1 the existi^-c,
^rial L_ ._,..,;rova
them, c;
rably» It vdll be o f much use if Dr.Derksen
1 contact with the American
'i
V»**... ...,..-...•.,. ...w .;....-w ;^onerally rscornised as the ,,...-.-. ~ ,.-:.iaple#
C ^ the other hand w» hope that th© experience with the special
type o f business cycle rsaearcfc
one at The Hague m a y be
of so'^^' ""torest to American inv.v.^«,..j5atorö tooj end we eacpect
that
criticisms will b e highly valuable to our work.
,...^,-,-...•^5^ 'Chat t>'=>"'*« ^••-i-'ticul.'jT" •«'*„11 ^'""' ... ...ome vf.lue t o
y o u , I restaln
Y o u r s v e r y sincnr-T ,

(J.Tinbergen).