HP 50g Graphing Calculator - Manual (Page 585)

Page 18-18
The functions included are:
BARPL: produces a bar plot with data in Xcol column of the ΣDATA matrix.
HISTP: produces histogram of the data in Xcol column in the ΣDATA matrix,
using the default width corresponding to 13 bins unless the bin size is
modified using function BINS in the 1VAR sub-menu (see above).
SCATR: produces a scatterplot of the data in Ycol column of the ΣDATA matrix
vs. the data in Xcol column of the ΣDATA matrix. Equation fitted will be
stored in the variable EQ.
The FIT sub-menu
The FIT sub-menu contains functions used to fit equations to the data in columns
Xcol and Ycol of the
ΣDATA matrix.
The functions available in this sub-menu are:
ΣLINE: provides the equation corresponding to the most recent fitting.
LR: provides intercept and slope of most recent fitting.
PREDX: used as y
@PREDX, given y find x for the fitting y = f(x).
PREDY: used as x @PREDY, given x find y for the fitting y = f(x).
CORR: provides the correlation coefficient for the most recent fitting.
COV: provides sample co-variance for the most recent fitting
PCOV: shows population co-variance for the most recent fitting.
The SUMS sub-menu
The SUMS sub-menu contains functions used to obtain summary statistics of the
data in columns Xcol and Ycol of the
ΣDATA matrix.
ΣX : provides the sum of values in Xcol column.
ΣY : provides the sum of values in Ycol column.