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 y1 on y2. |
B |
Slope in the linear relation of y1 on y2. |
S |
SD for the linear relation of y1 on y2. Can be |
#' y2DA
takes intercept(A
), slope(B
) and sd(S
) from
the relationship y1=A+B y2 + E
with sd(E
)=E
, and
returns a vector of length 3 with names
"int(t-f)","slope(t-f)","sd(t-f)"
, where t
refers to "to"
(y1
and f
to "from" y2
.
y2DA
returns a 3-component vector with names
c("DA-int","DA-slope","DA-sd")
, referring to differences
D=y1-y2
as a linear function of A=(y1+y2)/2
.
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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