Casio RM-9850GA PLUS Bedienungsanleitung PDF herunterladen (Seite 5)

Data Analysis on the Casio cfx-9850G Plus

1. DATA ENTRY AND EDITING

From RUN mode, press MENU 2 to enter STAT mode. Data are entered in Lists, labelled List 1 to List 6.

Move between and around lists using the cursor keys. Enter data in columns, followed by EXE . Correct

any typing errors by moving the cursor to the incorrect entry and then entering the correct value.

To delete an existing column of data before entering new data, first move the cursor to the column with

or . Then press F6 and F4 (DEL

A). Finally, press F1 (YES) to confirm.

2. STATISTICS

Various statistics can be calculated by first pressing F2 (CALC). (If the F2 key does not show the

CALC menu name, first press the continuation key, F6 .) Both univariate (1VAR) and bivariate (2VAR)

statistics are available. Use the cursor to see the rest of the statistics, since there is more than a whole

screenful available.

Various regression coefficients and a correlation coefficient are also available for bivariate data; press

F3 (REG) and choose the preferred model.

Press F6 (SET) to select a variable to be used for univariate statistics and a pair of variables for bivariate

statistics. (Notice that frequencies can be set as 1 or as a variable list, depending on the nature of the

data.) Press EXIT when finished setting these.

3. GRAPHS

Press EXIT to return to the data screen. Various kinds of graphs of data can be drawn after pressing

F1 (GRPH).

For most graphs, it is best to start by setting the calculator to automatically choose suitable scales. Press

SHIFT MENU and check that Stat Wind is set to Auto and Resid List is set to None. Press EXIT to return.

Three graphs, referred to as Graph 1, 2 and 3 can be defined at once. Each of the three graphs can be set

by first pressing F6 (SET). Use the cursor to choose what sort of graph you want, and to identify the

variables.

To draw a graph, press one of the immediate commands F1 (GPH1), F2 (GPH2) or F3 (GPH3). Press

EXIT to return to the data after drawing a graph.

For bivariate data, the most likely choices are for a scatter graph (Scat) or a line graph (xy). Once a

bivariate graph is drawn, data can be traced with SHIFT F1 . Alternatively, regression models can be

fitted using the appropriate function keys. When a regression model is chosen, the relevant regression

function is shown. You can then press F5 (COPY) to copy the function into the function graphing list or

F6 (DRAW) to draw the graph on the screen. (It is not necessary to copy the function.) Several regression

lines can be drawn in succession.

Residuals can be computed and analysed by first pressing SHIFT MENU and then choosing a suitable

list in which to store them in Resid List. (The contents of the list will be replaced by the residuals.) To

plot residuals, first define a suitable graph.

For univariate data, a box plot is a good choice. If a histogram is preferred to represent univariate data, it

is best to first change Stat Wind to Manual, and then to adjust the viewing window to suit the likely

values (x) and frequencies (y). When the histogram is drawn, the pitch variable will represent the interval

width.

More than one graph can be drawn at once (e.g. a pair of box plots. Use F4 (SEL) to select which graphs

are to be drawn.

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