| get_em_vec {geocausal} | R Documentation |
convert a list of im objects to a vector
Description
'get_em_vec()' get the vector form of a column of a hyperframe that summarizes the effect modifier data in heterogeneity analysis
Usage
get_em_vec(em, time_after = TRUE, lag, entire_window = NULL, ngrid = NULL)
Arguments
em |
column of a hyperframe that summarizes effect modifier data. In the form of 'hyperframe$column'. |
time_after |
whether to include one unit time difference between treatment and outcome. By default = TRUE |
lag |
integer that specifies lags to calculate causal estimates |
entire_window |
owin object (the entire region of interest). If given, then the values outside the region will be set to 'NA'. |
ngrid |
a number or a vector of two numbers that specify the dimension of pixels. If NULL, the pixel dimension of the original images will not be changed |
Details
The function 'get_em_vec()' get the vector form of the effect modifier in the heterogeneity analysis. It is useful if you want to construct the variance matrix 'E_mat' that is passed to the function 'get_cate()'