HP 33s - Manual (Page 265)

Statistics Programs 16–5
Program Lines:
(In RPN mode)
Description
!  Stores b in B.
#$  Displays value.

P Calculates coefficient m.
 !  Stores m in M.
 #$  Displays value.
Checksum and length: 9CC9 36
&
  & Defines the beginning of the estimation (projection) loop.
&
  "! % Displays, prompts for, and, if changed, stores x–value in X.
&
 % 1 1L2 2 Calls subroutine to compute
yˆ
.
&
 ! & Stores
yˆ
–value in Y.
&
  "! & Displays, prompts for, and, if changed, stores y–value in Y.
&

&
! - L Adjusts index value to address the appropriate subroutine.
&
% 1 1L2 2 Calls subroutine to compute xˆ .
&
! % Stores xˆ in X for next loop.
&

! & Loops for another estimate.
Checksum and length: 9B34 42

   This subroutine calculates
yˆ
for the straight–line model.

  

 º %

 -  Calculates
yˆ
= MX + B.

 ! Returns to the calling routine.
Checksum and length: F321 15

   This subroutine calculates xˆ for the straight–line model.

 ! . L Restores index value to its original value.

  &

 . 

 ª  Calculates xˆ =(Y – B) ÷ M.

! Returns to the calling routine.
Checksum and length: 65AB 18

   This subroutine calculates
yˆ
for the logarithmic model.