Re: Q: dichotomous variables

In 1970, the DEC10 was fully interactive. We used teletype machines at 110 baud.

I even knew of IBM environments where card were used even as late as 1985!



John Uebersax wrote:
On Apr 16, 11:41 pm, Ray Koopman <koop...@xxxxxx> wrote:
On Apr 14, 10:36 pm, John Uebersax <jsueber...@xxxxxxxxx> wrote:

[...] In 1970,
people were doing factor analysis with manual calculations!
1960 maybe, but not 1970!

It wasn't the only alternative, but people were still doing it the old
way.

I took a grad course in factor analysis with Benjamin Fruchter, a
student of R. Cattel, in 1975. We used Fruchter's text, including the
exercises based on manual factor analysis calculations.

The alternative, even in 1975, was toting a stack of 80-character IBM
punch cards to the computation center for processing. :)

John
.