RATIO

RATIO (LET)

Let Subcommand

Compute the ratio of the sum of two variables.

This statistic computes
\( \frac{\sum_{i=1}^{n}{Y_1(i)}} {\sum_{i=1}^{n}{Y_2(i)}} \)

In the current implementation, Y₁ and Y₂ are assumed to have the same number of elements.

In the typical use of this command, Y₂ denotes the number of cases or number of trials while Y₁ denotes the corresponding number of successes or failures (e.g., the number of successes might be the number of false negatives or false positives). This statistic then computes the success rate over all groups.

LET <par> = RATIO <y1> <y2>             <SUBSET/EXCEPT/FOR qualification>
where <y1> is the first response variable;
            <y2> is the second response variable;
            <par> is a parameter where the computed ratio is stored;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.

LET A = RATIO Y1 Y2
LET A = RATIO Y1 Y2 SUBSET TAG > 2

Dataplot statistics can be used in 20+ commands. For details, enter
HELP STATISTICS

None

None

TABULATE	= Compute a statistic for data with one grouping variable.
CROSS TABULATE	= Compute a statistic for data with two grouping variables.
STATISTIC PLOT	= Generate a plot of a statistic for data with a single grouping variable.
CROSS TABULATE PLOT	= Generate a plot of a statistic for data with two grouping variables.
BOOTSTRAP PLOT	= Generate a bootstrap plot for a given statistic.

Linear Regression

12/2005

 
LET Y1 = DATA 2 4 0 1 8 5 5 5 2 2
LET Y2 = 10 FOR I = 1 1 10
LET A = RATIO Y1 Y2