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POSEM (CFA) in R leads to error - not enough memory?
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copied!<p>I am trying to conduct a confirmatory factor analysis (CFA) in R. I keep getting an error:</p> <blockquote> <blockquote> <p>Warning message: In eval(expr, envir, enclos) : Could not compute QR decomposition of Hessian. Optimization probably did not converge.</p> </blockquote> </blockquote> <p>I execute the following code:</p> <pre><code>library(sem) cov.matrix <- cov(na.omit(factor.data)) cfa.model1 <- specifyModel() EXPERT_POWER -> Q9_c, expert1 EXPERT_POWER -> Q9_s, expert2 EXPERT_POWER -> Q9_z, expert3 EXPERT_POWER -> Q9_al, expert4 REFERENT_POWER -> Q9_e, referent1 REFERENT_POWER -> Q9_o, referent2 REFERENT_POWER -> Q9_aa, referent3 REFERENT_POWER -> Q9_ai, referent4 INFORMATIONAL_POWER -> Q9_d, informational1 INFORMATIONAL_POWER -> Q9_q, informational2 INFORMATIONAL_POWER -> Q9_x, informational3 INFORMATIONAL_POWER -> Q9_ap, informational4 LEGITIMATE_POWER_OF_DEPENDENCE -> Q9_i, ldependence1 LEGITIMATE_POWER_OF_DEPENDENCE -> Q9_p, ldependence2 LEGITIMATE_POWER_OF_DEPENDENCE -> Q9_y, ldependence3 LEGITIMATE_POWER_OF_DEPENDENCE -> Q9_an, ldependence4 PERSONAL_REWARD_POWER -> Q9_h, preward1 PERSONAL_REWARD_POWER -> Q9_n, preward2 PERSONAL_REWARD_POWER -> Q9_ac, preward3 PERSONAL_REWARD_POWER -> Q9_ag, preward4 LEGITIMATE_POWER_OF_RECIPROCITY -> Q9_g, lreciprocity1 LEGITIMATE_POWER_OF_RECIPROCITY -> Q9_l, lreciprocity2 LEGITIMATE_POWER_OF_RECIPROCITY -> Q9_af, lreciprocity3 LEGITIMATE_POWER_OF_RECIPROCITY -> Q9_aq, lreciprocity4 IMPERSONAL_COERCIVE_POWER -> Q9_f, icoercive1 IMPERSONAL_COERCIVE_POWER -> Q9_m, icoercive2 IMPERSONAL_COERCIVE_POWER -> Q9_ae, icoercive3 IMPERSONAL_COERCIVE_POWER -> Q9_am, icoercive4 LEGITIMATE_POWER_OF_EQUITY -> Q9_k, lequity1 LEGITIMATE_POWER_OF_EQUITY -> Q9_u, lequity2 LEGITIMATE_POWER_OF_EQUITY -> Q9_ad, lequity3 LEGITIMATE_POWER_OF_EQUITY -> Q9_aj, lequity4 IMPERSONAL_REWARD_POWER -> Q9_a, ireward1 IMPERSONAL_REWARD_POWER -> Q9_v, ireward2 IMPERSONAL_REWARD_POWER -> Q9_ak, ireward3 IMPERSONAL_REWARD_POWER -> Q9_ao, ireward4 PERSONAL_COERCIVE_POWER -> Q9_j, pcoercive1 PERSONAL_COERCIVE_POWER -> Q9_r, pcoercive2 PERSONAL_COERCIVE_POWER -> Q9_w, pcoercive3 PERSONAL_COERCIVE_POWER -> Q9_ar, pcoercive4 LEGITIMATE_POWER_OF_POSITION -> Q9_b, lposition1 LEGITIMATE_POWER_OF_POSITION -> Q9_t, lposition2 LEGITIMATE_POWER_OF_POSITION -> Q9_ab, lposition3 LEGITIMATE_POWER_OF_POSITION -> Q9_ah, lposition4 EXPERT_POWER <-> EXPERT_POWER, NA, 1 REFERENT_POWER <-> REFERENT_POWER, NA, 1 INFORMATIONAL_POWER <-> INFORMATIONAL_POWER, NA, 1 LEGITIMATE_POWER_OF_DEPENDENCE <-> LEGITIMATE_POWER_OF_DEPENDENCE, NA, 1 PERSONAL_REWARD_POWER <-> PERSONAL_REWARD_POWER, NA, 1 LEGITIMATE_POWER_OF_RECIPROCITY <-> LEGITIMATE_POWER_OF_RECIPROCITY, NA, 1 IMPERSONAL_COERCIVE_POWER <-> IMPERSONAL_COERCIVE_POWER, NA, 1 LEGITIMATE_POWER_OF_EQUITY <-> LEGITIMATE_POWER_OF_EQUITY, NA, 1 IMPERSONAL_REWARD_POWER <-> IMPERSONAL_REWARD_POWER, NA, 1 PERSONAL_COERCIVE_POWER <-> PERSONAL_COERCIVE_POWER, NA, 1 LEGITIMATE_POWER_OF_POSITION <-> LEGITIMATE_POWER_OF_POSITION, NA, 1 Q9_c <-> Q9_c, error1 Q9_s <-> Q9_s, error2 Q9_z <-> Q9_z, error3 Q9_al <-> Q9_al, error4 Q9_e <-> Q9_e, error5 Q9_o <-> Q9_o, error6 Q9_aa <-> Q9_aa, error7 Q9_ai <-> Q9_ai, error8 Q9_d <-> Q9_d, error8 Q9_q <-> Q9_q, error10 Q9_x <-> Q9_x, error11 Q9_ap <-> Q9_ap, error12 Q9_i <-> Q9_i, error13 Q9_p <-> Q9_p, error14 Q9_y <-> Q9_y, error15 Q9_an <-> Q9_an, error16 Q9_h <-> Q9_h, error17 Q9_n <-> Q9_n, error18 Q9_ac <-> Q9_ac, error19 Q9_ag <-> Q9_ag, error20 Q9_g <-> Q9_g, error21 Q9_l <-> Q9_l, error22 Q9_af <-> Q9_af, error23 Q9_aq <-> Q9_aq, error24 Q9_f <-> Q9_f, error25 Q9_m <-> Q9_m, error26 Q9_ae <-> Q9_ae, error27 Q9_am <-> Q9_am, error28 Q9_k <-> Q9_k, error29 Q9_u <-> Q9_u, error30 Q9_ad <-> Q9_ad, error31 Q9_aj <-> Q9_aj, error32 Q9_a <-> Q9_a, error33 Q9_v <-> Q9_v, error34 Q9_ak <-> Q9_ak, error35 Q9_ao <-> Q9_ao, error36 Q9_j <-> Q9_j, error37 Q9_r <-> Q9_r, error38 Q9_w <-> Q9_w, error39 Q9_ar <-> Q9_ar, error40 Q9_b <-> Q9_b, error41 Q9_t <-> Q9_t, error42 Q9_ab <-> Q9_ab, error43 Q9_ah <-> Q9_ah, error44 EXPERT_POWER <-> REFERENT_POWER, cov1 EXPERT_POWER <-> INFORMATIONAL_POWER, cov2 EXPERT_POWER <-> LEGITIMATE_POWER_OF_DEPENDENCE, cov3 EXPERT_POWER <-> PERSONAL_REWARD_POWER, cov4 EXPERT_POWER <-> LEGITIMATE_POWER_OF_RECIPROCITY, cov5 EXPERT_POWER <-> IMPERSONAL_COERCIVE_POWER, cov6 EXPERT_POWER <-> LEGITIMATE_POWER_OF_EQUITY, cov7 EXPERT_POWER <-> IMPERSONAL_REWARD_POWER, cov8 EXPERT_POWER <-> PERSONAL_COERCIVE_POWER, cov9 EXPERT_POWER <-> LEGITIMATE_POWER_OF_POSITION, cov10 REFERENT_POWER <-> INFORMATIONAL_POWER, cov11 REFERENT_POWER <-> LEGITIMATE_POWER_OF_DEPENDENCE, cov12 REFERENT_POWER <-> PERSONAL_REWARD_POWER, cov13 REFERENT_POWER <-> LEGITIMATE_POWER_OF_RECIPROCITY, cov14 REFERENT_POWER <-> IMPERSONAL_COERCIVE_POWER, cov15 REFERENT_POWER <-> LEGITIMATE_POWER_OF_EQUITY, cov16 REFERENT_POWER <-> IMPERSONAL_REWARD_POWER, cov17 REFERENT_POWER <-> PERSONAL_COERCIVE_POWER, cov18 REFERENT_POWER <-> LEGITIMATE_POWER_OF_POSITION, cov19 INFORMATIONAL_POWER <-> LEGITIMATE_POWER_OF_DEPENDENCE, cov20 INFORMATIONAL_POWER <-> PERSONAL_REWARD_POWER, cov21 INFORMATIONAL_POWER <-> LEGITIMATE_POWER_OF_RECIPROCITY, cov22 INFORMATIONAL_POWER <-> IMPERSONAL_COERCIVE_POWER, cov23 INFORMATIONAL_POWER <-> LEGITIMATE_POWER_OF_EQUITY, cov24 INFORMATIONAL_POWER <-> IMPERSONAL_REWARD_POWER, cov25 INFORMATIONAL_POWER <-> PERSONAL_COERCIVE_POWER, cov26 INFORMATIONAL_POWER <-> LEGITIMATE_POWER_OF_POSITION, cov27 LEGITIMATE_POWER_OF_DEPENDENCE <-> PERSONAL_REWARD_POWER, cov28 LEGITIMATE_POWER_OF_DEPENDENCE <-> LEGITIMATE_POWER_OF_RECIPROCITY, cov29 LEGITIMATE_POWER_OF_DEPENDENCE <-> IMPERSONAL_COERCIVE_POWER, cov30 LEGITIMATE_POWER_OF_DEPENDENCE <-> LEGITIMATE_POWER_OF_EQUITY, cov31 LEGITIMATE_POWER_OF_DEPENDENCE <-> IMPERSONAL_REWARD_POWER, cov32 LEGITIMATE_POWER_OF_DEPENDENCE <-> PERSONAL_COERCIVE_POWER, cov33 LEGITIMATE_POWER_OF_DEPENDENCE <-> LEGITIMATE_POWER_OF_POSITION, cov34 PERSONAL_REWARD_POWER <-> LEGITIMATE_POWER_OF_RECIPROCITY, cov35 PERSONAL_REWARD_POWER <-> IMPERSONAL_COERCIVE_POWER, cov36 PERSONAL_REWARD_POWER <-> LEGITIMATE_POWER_OF_EQUITY, cov37 PERSONAL_REWARD_POWER <-> IMPERSONAL_REWARD_POWER, cov38 PERSONAL_REWARD_POWER <-> PERSONAL_COERCIVE_POWER, cov39 PERSONAL_REWARD_POWER <-> LEGITIMATE_POWER_OF_POSITION, cov40 LEGITIMATE_POWER_OF_RECIPROCITY <-> IMPERSONAL_COERCIVE_POWER, cov41 LEGITIMATE_POWER_OF_RECIPROCITY <-> LEGITIMATE_POWER_OF_EQUITY, cov42 LEGITIMATE_POWER_OF_RECIPROCITY <-> IMPERSONAL_REWARD_POWER, cov43 LEGITIMATE_POWER_OF_RECIPROCITY <-> PERSONAL_COERCIVE_POWER, cov44 LEGITIMATE_POWER_OF_RECIPROCITY <-> LEGITIMATE_POWER_OF_POSITION, cov45 IMPERSONAL_COERCIVE_POWER <-> LEGITIMATE_POWER_OF_EQUITY, cov46 IMPERSONAL_COERCIVE_POWER <-> IMPERSONAL_REWARD_POWER, cov47 IMPERSONAL_COERCIVE_POWER <-> PERSONAL_COERCIVE_POWER, cov48 IMPERSONAL_COERCIVE_POWER <-> LEGITIMATE_POWER_OF_POSITION, cov49 LEGITIMATE_POWER_OF_EQUITY <-> IMPERSONAL_REWARD_POWER, cov50 LEGITIMATE_POWER_OF_EQUITY <-> PERSONAL_COERCIVE_POWER, cov51 LEGITIMATE_POWER_OF_EQUITY <-> LEGITIMATE_POWER_OF_POSITION, cov52 IMPERSONAL_REWARD_POWER <-> PERSONAL_COERCIVE_POWER, cov53 IMPERSONAL_REWARD_POWER <-> LEGITIMATE_POWER_OF_POSITION, cov54 PERSONAL_COERCIVE_POWER <-> LEGITIMATE_POWER_OF_POSITION, cov55 cfa1 <- sem(cfa.model1, cov.matrix, nrow(factor.data)) summary(cfa1,fit.indices=c("RMSEA", "NNFI", "CFI")) </code></pre> <p>When I consider less latent variables in the model it is calculated without any problems. Also when I remove the last 55 lines of code in the specifyModel() command, the calculation is executed. </p> <p>Since I observed a relative long duration for the calculation, and a high usage of memory whilst doing so, I have the suspicion that R can't execute the calculation due to too little system memory (2GB). <strong>Is that possible or are there any other causes for the problem which I haven't noticed?</strong></p>

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