Description Usage Arguments Details Value Author(s) References Examples
The functions DA2y
and y2DA
are convenience functions that
convert the estimates of intercept, slope and sd from the regression of
D=y1-y2 on A=(y1+y2)/2, back and forth
to the resulting intercept, slope and sd in the relationship between
y1 and y2, cf. Carstensen (2010), equation 6.
1 |
a |
Intercept in the linear relation of the differences |
b |
Slope in the linear relstion of the differences to the averages. |
s |
SD from the regression of the differences in the averages. Can be
|
DA2y
takes the intercept(a
), slope(b
) and sd(s
) from
the relationship (y1-y2)=a+b((y1+y2)/2)+e
with sd(e
)=s
,
and returns a two by 3 matrix with columns "int","slope","sd"
and
rows "y1|2","y2|1"
.
DA2y
returns a 2 by 3 matrix with rownames c("y1|2","y2|1")
and columnnames c("int","slope","sd")
, calculated under the
assumption that the differences were formed as D <- y1 - y2
.
Bendix Carstensen, Steno Diabetes Center, bendix.carstensen@regionh.dk, http://BendixCarstensen.com/MethComp
B. Carstensen: Comparing methods of measurement: Extending the LoA by regression. Stat Med, 29:401-410, 2010.
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