anova2 {rgr} | R Documentation |
Function to prepare data stored in alternate forms from that expected by function anova1
for its use. For further details see 'x' in Arguments below .
anova2(x, name = deparse(substitute(x)), log = FALSE, ifalt = FALSE)
x |
a column vector from a matrix or data frame, x[1], ..., x[2*n] . The default is that the first n members of the vector are the first measurements and the second n members are the duplicate measurements. If the measurements alternate, i.e. duplicate pair 1 measurement 1 followed by measurement 2, etc., set ifalt = TRUE . |
name |
a title can be displayed with the results, e.g., name = "Duplicate measurements of Magnetic Susceptibility" . If this field is undefined the character string for x is used as a default. |
log |
if a logarithmic transformation of the data is required to meet homogeneity of variance considerations (i.e. severe heteroscedasticity) set log = TRUE . This is also advisable if the range of the observations exceeds 1.5 orders of magnitude. |
ifalt |
set ifalt = TRUE to accommodate alternating sets of paired observations. |
For further details see anova1
.
If the data are as n duplicate pairs, x1 and x2, use function anova1
.
Any less than detection limit values represented by negative values, or zeros or other numeric codes representing blanks in the data vector, must be removed prior to executing this function, see ltdl.fix.df
.
Robert G. Garrett
## Make test data ms.data2 available data(ms.data2) attach(ms.data2) ## Undertake an ANOVA for duplicate measurements on rock samples anova2(MS, log=TRUE, name = "Duplicate measurements of Magnetic Susceptibility") ## Detach test data ms.data2 detach(ms.data2) ## Make test data ms.data3 available data(ms.data3) attach(ms.data3) ## Undertake an ANOVA for duplicate measurements on rock samples anova2(MS, log=TRUE, ifalt = TRUE, name = "Duplicate measurements of Magnetic Susceptibility") ## Detach test data ms.data3 detach(ms.data3)