<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi All,<div class=""><br class=""></div><div class="">I have run into two roadblocks with my reverse correlation study. <span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class="">My first issue concerns calculating infoVal scores. Following the use of the command "computeInfoVal2IFC(ci, rdata)," I have been receiving the message "Error: $ operator is invalid for atomic vectors." Would you happen to know how I can resolve this error? </span></div><div class=""><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; orphans: 2; widows: 2; background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div style="orphans: 2; widows: 2;" class=""><font color="#222222" face="Arial, Helvetica, sans-serif" size="2" class=""><span style="caret-color: rgb(34, 34, 34); background-color: rgb(255, 255, 255);" class="">M</span></font><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);" class="">y second roadblock regards calculating Cronbach's alpha on pixel luminance values for participants' CI noise patterns. Would anyone be able to refer me to a source for how to compute this function in R? I am hoping to compute Cronbach's alpha and to then correlate pixel luminance values between my classification images for different constructs. While I understand how to calculate these functions for numerical values, I am unsure how to do so for pixel luminance values.</span></div><div style="orphans: 2; widows: 2;" class=""><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div style="orphans: 2; widows: 2;" class=""><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);" class="">Thank you so much for your help!</span></div><div style="orphans: 2; widows: 2;" class=""><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);" class=""><br class=""></span></div><div style="orphans: 2; widows: 2;" class=""><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);" class="">Best,</span></div><div style="orphans: 2; widows: 2;" class=""><span style="color: rgb(34, 34, 34); font-family: Arial, Helvetica, sans-serif; font-size: small; background-color: rgb(255, 255, 255);" class="">Shivani</span></div></body></html>